subject:(Spark ignition engines)

University of Victoria

1. Pitt, Philip Lawrence. The early phase of spark ignition.

Degree: Department of Physics and Astronomy, 2018, University of Victoria

URL: https://dspace.library.uvic.ca//handle/1828/9664

► In this dissertation, some practical ignition techniques are presented that show how some problems of lean-burn combustion can be overcome. Then, to shed light on… (more)

Subjects/Keywords: Spark ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pitt, P. L. (2018). The early phase of spark ignition. (Thesis). University of Victoria. Retrieved from https://dspace.library.uvic.ca//handle/1828/9664

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pitt, Philip Lawrence. “The early phase of spark ignition.” 2018. Thesis, University of Victoria. Accessed March 05, 2021. https://dspace.library.uvic.ca//handle/1828/9664.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pitt, Philip Lawrence. “The early phase of spark ignition.” 2018. Web. 05 Mar 2021.

Vancouver:

Pitt PL. The early phase of spark ignition. [Internet] [Thesis]. University of Victoria; 2018. [cited 2021 Mar 05]. Available from: https://dspace.library.uvic.ca//handle/1828/9664.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pitt PL. The early phase of spark ignition. [Thesis]. University of Victoria; 2018. Available from: https://dspace.library.uvic.ca//handle/1828/9664

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan State University

2. Chinnathambi, Prasanna. Experiments on the effects of dilution and fuel composition on ignition of gasoline and alternative fuels in a rapid compression machine.

Degree: 2019, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:48224

►

Thesis Ph. D. Michigan State University. Mechanical Engineering 2019.

In the first part of this work, ignition of methane-air mixtures under excess air dilution is… (more)

▼

Thesis Ph. D. Michigan State University. Mechanical Engineering 2019.

In the first part of this work, ignition of methane-air mixtures under excess air dilution is studied. When excess air is used in SI engine operation, thermal efficiency is increased due to increase in compression ratio together with reduced pumping and heat loses. However, stable operation with excess air is challenging due to poor flammability of the resulting diluted mixture. Hence in order to achieve stable and complete combustion a turbulent jet ignition (TJI) system is used to improve combustion of lean methane-air mixtures. Various nozzle designs and operating strategies for a TJI system were tested in a rapid compression machine. 10-90% burn duration measurements were useful in assessing the performance of the nozzle designs while the 0-10% burn durations indicated if optimal air-fuel ratio is achieved within the pre-chamber at the time of ignition. The results indicated that distributed-jets TJI system offered faster and stable combustion while the concentrated-jets TJI system offered better dilution tolerance.Knock in a SI engine occurs due to autoignition of the end gas mixture and typically occurs in the negative temperature coefficient (NTC) region of the fuel-air mixture. Dilution of intake charge with cold exhaust recirculation gases (EGR) reduces combustion temperatures and decreases mixture reactivity thereby reducing knocking tendency. This enables optimal spark timings to be used, thereby increasing efficiency of SI engines which would otherwise be knock limited. Effect of cold EGR dilution is studied in the RCM by measuring the autoignition delay times of gasoline and gasoline surrogate mixtures diluted with varying levels of CO2. The autoignition experiments in the RCM were performed using a novel direct test chamber (DTC) charge preparation approach. The DTC approach enabled mixture preparation directly within the combustion chamber and eliminated the need for mixing tanks. Effect of CO2 dilution in retarding the autoignition delay times was more pronounced in the NTC region, while it was weaker in the low temperature and high temperature regions. The retarding effect was found to be dependent on both the octane number and the fuel composition of the gasoline being studied.Finally, the effect of substituting ethanol(biofuel) in gasoline surrogates for up to 40% by volume is studied. Ethanol is an octane booster, but it blends antagonistically with aromatics such as toluene and synergistically with alkanes with respect to the resulting octane number of the blends. In order to study this blending effect, two gasoline surrogates containing only alkanes (PRF), and alkanes with large amounts of toluene (TRF) are blended with varying levels of ethanol. The ignition delay times of the resulting mixtures are measured in a rapid compression machine and kinetic analysis was carried out using numerical simulations. The kinetic analysis revealed that ethanol controlled the final stages of ignition for the PRF blends when more than 10%…

Advisors/Committee Members: Toulson, Elisa, Lira, Carl, Jaberi, Farhad, Wickman, Indrek.

Subjects/Keywords: Spark ignition engines – Ignition; Spark ignition engines – Alternative fuels; Mechanical engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chinnathambi, P. (2019). Experiments on the effects of dilution and fuel composition on ignition of gasoline and alternative fuels in a rapid compression machine. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:48224

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chinnathambi, Prasanna. “Experiments on the effects of dilution and fuel composition on ignition of gasoline and alternative fuels in a rapid compression machine.” 2019. Thesis, Michigan State University. Accessed March 05, 2021. http://etd.lib.msu.edu/islandora/object/etd:48224.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chinnathambi, Prasanna. “Experiments on the effects of dilution and fuel composition on ignition of gasoline and alternative fuels in a rapid compression machine.” 2019. Web. 05 Mar 2021.

Vancouver:

Chinnathambi P. Experiments on the effects of dilution and fuel composition on ignition of gasoline and alternative fuels in a rapid compression machine. [Internet] [Thesis]. Michigan State University; 2019. [cited 2021 Mar 05]. Available from: http://etd.lib.msu.edu/islandora/object/etd:48224.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chinnathambi P. Experiments on the effects of dilution and fuel composition on ignition of gasoline and alternative fuels in a rapid compression machine. [Thesis]. Michigan State University; 2019. Available from: http://etd.lib.msu.edu/islandora/object/etd:48224

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

3. Okhovat, Sebastian. Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions.

Degree: MS, Mechanical Engineering, 2015, Oregon State University

URL: http://hdl.handle.net/1957/57994

► Numerous physical and chemical processes are required for successful ignition of a flammable mixture, many of which have been well characterized. However, one aspect of… (more)

▼ Numerous physical and chemical processes are required for successful ignition of a flammable mixture, many of which have been well characterized. However, one aspect of the ignition process that has received limited consideration is understanding the temperature of the spark kernel. A spark kernel is the volume of heated gas that develops after plasma formation and dissipation by an electrical discharge. Thermal measurements are critical for determining if reactions become self-sustaining and improving the validity of modeling efforts. The need for quantified kernel temperatures is extended to conditions that approach the flow fields within combustion applications, such as gas turbine engines. Based on the motivation, the focus of this work was to determine the temperature of kernels and investigate the influence a cross-flow has on the temporal temperature evolution. Representative results were compared against kernel temperatures in a quiescent environment to highlight differences between the two flow conditions. In this study, a sunken fire igniter was placed in an open loop wind tunnel and discharged into a non-reacting cross-flow. Kernel temperatures, after the plasma dissipated, were determined from radiation intensity measurements and by solving the radiation transfer equation. The temperature evolution was investigated in a quiescent environment and for a range of cross-flow velocities (5.8-15.6 m/s). For both quiescent and cross-flow conditions, kernels developed into a toroidal vortex. Surrounding air was entrained into the center of the kernel, resulting in relatively lower temperatures compared to the edges. Average peak kernel temperatures in quiescent conditions were 950 K, whereas kernels in a cross-flow approached 1250 K. The higher peak temperatures were attributed to a reduced relative velocity of the vortex caused by the interaction with the cross-flow. This resulted in decreased entrainment, particularly located at the upstream side of the kernel. Most of the temperature evolution of kernels was experienced within 1.3 ms after plasma was no longer detected; up to a 500 K difference was determined between 0.6 and 1.3 ms. Kernels beyond 1.3 ms reached a uniform temperature near 600 K and had little to no variation as radiation intensities dissipated beyond optical detection. Bifurcation of kernels was detected in one-third of all spark events for both quiescent and cross-flow conditions. The sensible energy of kernels was reported to decrease with time for all cases. Higher cross-flow velocities resulted in less sensible energy. This was attributed to a reduction in apparent kernel volume even with higher temperatures. Advisors/Committee Members: Blunck, David (advisor), Squires, Nancy (committee member).

Subjects/Keywords: cross-flow; Spark ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Okhovat, S. (2015). Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/57994

Chicago Manual of Style (16^th Edition):

Okhovat, Sebastian. “Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions.” 2015. Masters Thesis, Oregon State University. Accessed March 05, 2021. http://hdl.handle.net/1957/57994.

MLA Handbook (7^th Edition):

Okhovat, Sebastian. “Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions.” 2015. Web. 05 Mar 2021.

Vancouver:

Okhovat S. Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions. [Internet] [Masters thesis]. Oregon State University; 2015. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/1957/57994.

Council of Science Editors:

Okhovat S. Temperature Evolution of Spark Kernels in Quiescent and Cross-flow Conditions. [Masters Thesis]. Oregon State University; 2015. Available from: http://hdl.handle.net/1957/57994

University of Arizona

4. Maynard, Samuel Edward, 1919-. Power distribution of a gasoline engine .

Degree: 1951, University of Arizona

URL: http://hdl.handle.net/10150/347701

Subjects/Keywords: Spark ignition engines.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Maynard, Samuel Edward, 1. (1951). Power distribution of a gasoline engine . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/347701

Chicago Manual of Style (16^th Edition):

Maynard, Samuel Edward, 1919-. “Power distribution of a gasoline engine .” 1951. Masters Thesis, University of Arizona. Accessed March 05, 2021. http://hdl.handle.net/10150/347701.

MLA Handbook (7^th Edition):

Maynard, Samuel Edward, 1919-. “Power distribution of a gasoline engine .” 1951. Web. 05 Mar 2021.

Vancouver:

Maynard, Samuel Edward 1. Power distribution of a gasoline engine . [Internet] [Masters thesis]. University of Arizona; 1951. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10150/347701.

Council of Science Editors:

Maynard, Samuel Edward 1. Power distribution of a gasoline engine . [Masters Thesis]. University of Arizona; 1951. Available from: http://hdl.handle.net/10150/347701

University of British Columbia

5. Dymala-Dolesky, Robert. The effects of turbulence enhancement on the performance of a spark-ignition engine.

Degree: Master of Applied Science - MASc, Mechanical Engineering, 1986, University of British Columbia

URL: http://hdl.handle.net/2429/26696

► An attempt has been undertaken to enhance turbulence in an S.I. engine at the final stage of the compression stroke, without affecting the intake process.… (more)

▼ An attempt has been undertaken to enhance turbulence in an S.I. engine at the final stage of the compression stroke, without affecting the intake process. The method employed to control the turbulence level made use of an original design called the squish-jet combustion chamber. The design had potential to generate jets in the chamber before CTDC and thus create dramatically different turbulent flow patterns. Natural gas, a slow burning fuel, was used for performance tests, and different levels of turbulence were expected to markedly affect the combustion process. A flow visualization experiment was performed under conditions similar to a motored engine. As a result, the jet development in the squish-jet type combustion chamber was documented. A new type of a flat cylinder head, and a set of squish-jet pistons were designed and manufactured. Experiments conducted on the redesigned Ricardo Hydra, single cylinder research engine, evaluated the influence of the squish-jet chamber on the mixture motion and the engine performance over a wide range of operating conditions. The jet velocities were measured with a hot wire probe located in the piston bowl, and turbulence parameters with a probe inserted through a cylinder head. The squish-jet design was evaluated for 6 different configurations. As a result it has been established that the squish-jet design does not create jets strong enough to dramatically enhance the turbulent flow field. The design, however, diminished the squish effect which is shown to be very important for the middle part of flame development. The simple squish design produces faster burning rate in the first half of the combustion process and develops the highest peak pressures. Variabilities of both cyclic IMEP and peak pressure are found to be unaffected by the presence or absence of strong squish motion. This suggests that the most important phase of combustion for the cyclic variation is the initial stage of the flame development. A comparison of ensembled pressure signals between combustion chamber designs, conducted at RAFR=1.00 and at RAFR=1.25 shows less dispersion in the latter case. It appears that at lean operation mixture motion influences combustion process to a lesser degree than at stochiometric conditions.

Subjects/Keywords: Spark ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dymala-Dolesky, R. (1986). The effects of turbulence enhancement on the performance of a spark-ignition engine. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/26696

Chicago Manual of Style (16^th Edition):

Dymala-Dolesky, Robert. “The effects of turbulence enhancement on the performance of a spark-ignition engine.” 1986. Masters Thesis, University of British Columbia. Accessed March 05, 2021. http://hdl.handle.net/2429/26696.

MLA Handbook (7^th Edition):

Dymala-Dolesky, Robert. “The effects of turbulence enhancement on the performance of a spark-ignition engine.” 1986. Web. 05 Mar 2021.

Vancouver:

Dymala-Dolesky R. The effects of turbulence enhancement on the performance of a spark-ignition engine. [Internet] [Masters thesis]. University of British Columbia; 1986. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2429/26696.

Council of Science Editors:

Dymala-Dolesky R. The effects of turbulence enhancement on the performance of a spark-ignition engine. [Masters Thesis]. University of British Columbia; 1986. Available from: http://hdl.handle.net/2429/26696

University of Texas – Austin

6. Seers, Patrice. Spark ignition: an experimental and numerical investigation.

Degree: PhD, Mechanical Engineering., 2003, University of Texas – Austin

URL: http://hdl.handle.net/2152/940

► The four phases of a spark ignition discharge are reviewed with respect to the physics and chemistry involved. An equation based on the energy exchange… (more)

Subjects/Keywords: Spark ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Seers, P. (2003). Spark ignition: an experimental and numerical investigation. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/940

Chicago Manual of Style (16^th Edition):

Seers, Patrice. “Spark ignition: an experimental and numerical investigation.” 2003. Doctoral Dissertation, University of Texas – Austin. Accessed March 05, 2021. http://hdl.handle.net/2152/940.

MLA Handbook (7^th Edition):

Seers, Patrice. “Spark ignition: an experimental and numerical investigation.” 2003. Web. 05 Mar 2021.

Vancouver:

Seers P. Spark ignition: an experimental and numerical investigation. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2003. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2152/940.

Council of Science Editors:

Seers P. Spark ignition: an experimental and numerical investigation. [Doctoral Dissertation]. University of Texas – Austin; 2003. Available from: http://hdl.handle.net/2152/940

7. Mouriaux, Sophie. Simulation aux grandes échelles de l'allumage par bougie turbulent et de la propagation de la flamme dans les Moteurs à allumage commandé : Large Eddy simulation of the turbulent spark ignition and of the flame propagation in spark ignition engines.

Degree: Docteur es, Combustion, 2016, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2016SACLC046

► Le fonctionnement en régime très pauvre ou avec forts taux d'EGR des moteurs à allumage commandé (MAC) permet de réduire efficacement les émissions de CO2… (more)

▼ Le fonctionnement en régime très pauvre ou avec forts taux d'EGR des moteurs à allumage commandé (MAC) permet de réduire efficacement les émissions de CO2 et de Nox ; cependant ces stratégies se heurtent à l'augmentation des variabilités cycliques. Ces dernières sont principalement dues à la phase d'allumage qui devient critique de dilution. Le modèle ECFM-LES actuellement utilisé à IFPEn, basé sur la notion de densité de surface de flamme, est insuffisant pour décrire l'allumage dans ces conditions critiques. Dans ces travaux, l'approche TF-LES est adoptée, l'allumage étant alors décrit par un emballement cinétique des réactions chimiques lors d'une élévations locale de la température. Ces travaux définissent et évaluent une stratégie de simulation pour TF-LES en configuration moteur, qui permette une prédiction fine des allumages critiques et de la propagation turbulente de la flamme, afin de décrire le cycle moteur complet.Dans une première partie, des DNS d'allumages turbulents ont été réalisées, en modélisant la phase d'allumage par un dépôt d'énergie thermique (Lacaze et al., (2009)). Les calculs ont simulé les expériences d'allumage de Cardin et al. (2013), dans lesquelles l'énergie minimum d'allumage (MIE) d'un mélange mtéhane-air a été mesuré, pour différentes richesses pauvres et sous différentes intensités turbulentes. L'objectif principal des simulations a été de déterminer les paramètres numériques et physiques du modèle permettant de reproduire les allumages de l'expérience. Deux types de schémas cinétiques ont été évalués : un schéma simplifié et un schéma analytique (ARC), ce dernier reproduisant et les délais d'auto-allumage et la vitesse de flamme laminaire. Les résultats ont permis de définir des critères d'allumage et de mettre en évidence les différentes prédiction d'allumage avec les deux types de schémas cinétiques. Les résultats ont été également démontré que l'approche choisie permettait de prédire les bons niveaux d'énergie pour les allumages laminaires et à faible nombres de Kalovitz (Ka<10). Aux plus hauts nombres de Karlovitz, il a été montré que le modèle ED était insuffisant pour prédire les énergie d'allumage et qu'une description plus fine du dépôt d'énergie est nécessaire.Dans la seconde partie des travaux, un modèle de plissement dynamique (Wang et al., 2012) a été étudié, afin de décrire le développement hors-équilibre de la flamme dans la phase de propagation turbulente. Des études sur des flammes sphériques laminaires ont d'abord été menées. Ensuite, les premiers tests de configuration moteur ayant révélé des incompatibilités du modèle, des modifications ont été proposées. Le modèle de plissement dynamique modifié a été finalement évalué sur la configuration moteur ICAMDAC. Les résultats obtenus ont été comparés aux résultats obtenus par Robert et al. (2015) avec le modèle ECFM-LES, qui utilise une équation de transport de densité de surface de flamme décrivant le plissement hors-équilibre de la flamme. Les résultats obtenus avec le plissement dynamique sont en très bon accord… Advisors/Committee Members: Colin, Olivier (thesis director), Veynante, Denis (thesis director).

Subjects/Keywords: Combustion pré-mélangée; Allumage; Moteur à allumage commandé; Premixed combustion; Spark ignition; Spark ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mouriaux, S. (2016). Simulation aux grandes échelles de l'allumage par bougie turbulent et de la propagation de la flamme dans les Moteurs à allumage commandé : Large Eddy simulation of the turbulent spark ignition and of the flame propagation in spark ignition engines. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLC046

Chicago Manual of Style (16^th Edition):

Mouriaux, Sophie. “Simulation aux grandes échelles de l'allumage par bougie turbulent et de la propagation de la flamme dans les Moteurs à allumage commandé : Large Eddy simulation of the turbulent spark ignition and of the flame propagation in spark ignition engines.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed March 05, 2021. http://www.theses.fr/2016SACLC046.

MLA Handbook (7^th Edition):

Mouriaux, Sophie. “Simulation aux grandes échelles de l'allumage par bougie turbulent et de la propagation de la flamme dans les Moteurs à allumage commandé : Large Eddy simulation of the turbulent spark ignition and of the flame propagation in spark ignition engines.” 2016. Web. 05 Mar 2021.

Vancouver:

Mouriaux S. Simulation aux grandes échelles de l'allumage par bougie turbulent et de la propagation de la flamme dans les Moteurs à allumage commandé : Large Eddy simulation of the turbulent spark ignition and of the flame propagation in spark ignition engines. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Mar 05]. Available from: http://www.theses.fr/2016SACLC046.

Council of Science Editors:

Mouriaux S. Simulation aux grandes échelles de l'allumage par bougie turbulent et de la propagation de la flamme dans les Moteurs à allumage commandé : Large Eddy simulation of the turbulent spark ignition and of the flame propagation in spark ignition engines. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLC046

The Ohio State University

8. Iqbal, Asim. Fundamentals of Knock.

Degree: PhD, Mechanical Engineering, 2012, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1338146766

► In view of the declining global oil reserves and the environmental concerns associated with automotive emissions, it is imperative to improve the fuel efficiency of… (more)

▼ In view of the declining global oil reserves and the environmental concerns associated with automotive emissions, it is imperative to improve the fuel efficiency of engines. Using higher compression ratios or boosting the specific output through turbocharging are proven strategies to accomplish this goal. However, the ability to achieve elevated peak pressures required by either mechanism to be effective is limited by knock. The lack of understanding of knock also hinders the realization of potential benefits of homogeneous charge compression ignition, a promising technology that relies on controlled autoignition. Thus, knock is one of the most serious obstacles in the development of fuel efficient engines. For this reason, the phenomenon of knock has been studied extensively, but even after more than a century of mostly experimental research, the basic mechanism governing knock remains poorly understood. In order to develop a fundamental understanding of engine knock, detailed chemical kinetic modeling of the hydrocarbon oxidation mechanism associated with the autoignition process is conducted in CHEMKIN (a chemical kinetics software). Based on the insight gained from kinetic modeling, some of the key reactions and species that are instrumental to the autoignition of hydrocarbons are identified. The sensitivity of knock to various parameters including inlet pressure, inlet temperature, compression ratio, wall temperature, fuel-air equivalence ratio, and exhaust gas recirculation (EGR) is examined through CHEMKIN simulations. Ignition delay predictions for the autoignition of a toluene reference fuel (TRF) blend with an antiknock index of 91 (TRF 91), obtained through extensive chemical kinetic modeling in CHEMKIN for a constant volume reactor, are used to develop an improved ignition delay correlation for predicting knock in spark ignition (SI) engines. In addition to NOx control, EGR is increasingly being utilized for managing combustion phasing in SI engines to mitigate knock. Therefore, along with other operating parameters, the effects of EGR on autoignition are incorporated into the correlation to address the need for predicting ignition delay in SI engines operating with EGR. The modeling approach adopted for TRF 91 is then extended to develop an ignition delay correlation for an oxygenated surrogate fuel blend of 87 octane gasoline (with 10% ethanol). In addition, a conceptually new approach based on multiple timescales is developed to predict ignition delay for the autoignition of a primary reference fuel blend. Finally, the new ignition delay correlation for TRF 91 is implemented into the engine simulation tool GT-POWER and engine dynamometer experiments with knocking combustion are conducted to validate the knock predictions from the correlation. Comparison of knock onset predictions from GT-POWER with engine experiments illustrates the accuracy of the TRF 91 ignition delay correlation. Hence, the contributions of the present study include an enhanced understanding of the underlying physics governing… Advisors/Committee Members: Selamet, Ahmet (Advisor).

Subjects/Keywords: Mechanical Engineering; Knock; Spark Ignition Engines; Combustion; Ignition Delay; Kinetics; Ignition Delay Correlation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Iqbal, A. (2012). Fundamentals of Knock. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1338146766

Chicago Manual of Style (16^th Edition):

Iqbal, Asim. “Fundamentals of Knock.” 2012. Doctoral Dissertation, The Ohio State University. Accessed March 05, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338146766.

MLA Handbook (7^th Edition):

Iqbal, Asim. “Fundamentals of Knock.” 2012. Web. 05 Mar 2021.

Vancouver:

Iqbal A. Fundamentals of Knock. [Internet] [Doctoral dissertation]. The Ohio State University; 2012. [cited 2021 Mar 05]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1338146766.

Council of Science Editors:

Iqbal A. Fundamentals of Knock. [Doctoral Dissertation]. The Ohio State University; 2012. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1338146766

University of British Columbia

9. Kapil, Anil. Cycle-to-cycle variations in spark-ignition engines.

Degree: Master of Applied Science - MASc, Mechanical Engineering, 1988, University of British Columbia

URL: http://hdl.handle.net/2429/28392

► Pressure data measurements have been made in a single-cylinder, spark-ignition engine over 100 consecutive cycles. The engine was operated on natural gas at a wide… (more)

Subjects/Keywords: Spark ignition engines; Spark ignition engines – Testing

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kapil, A. (1988). Cycle-to-cycle variations in spark-ignition engines. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/28392

Chicago Manual of Style (16^th Edition):

Kapil, Anil. “Cycle-to-cycle variations in spark-ignition engines.” 1988. Masters Thesis, University of British Columbia. Accessed March 05, 2021. http://hdl.handle.net/2429/28392.

MLA Handbook (7^th Edition):

Kapil, Anil. “Cycle-to-cycle variations in spark-ignition engines.” 1988. Web. 05 Mar 2021.

Vancouver:

Kapil A. Cycle-to-cycle variations in spark-ignition engines. [Internet] [Masters thesis]. University of British Columbia; 1988. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2429/28392.

Council of Science Editors:

Kapil A. Cycle-to-cycle variations in spark-ignition engines. [Masters Thesis]. University of British Columbia; 1988. Available from: http://hdl.handle.net/2429/28392

10. Ahmed, Irufan. Simulation of turbulent flames relevant to spark-ignition engines.

Degree: PhD, 2014, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/245288https://www.repository.cam.ac.uk/bitstream/1810/245288/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/245288/4/thesis_ahmed.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/5/thesis_ahmed.pdf.jpg

► Combustion research currently aims to reduce emissions, whilst improving the fuel economy. Burning fuel in excess of air, or lean-burn combustion, is a promising alternative… (more)

▼ Combustion research currently aims to reduce emissions, whilst improving the fuel economy. Burning fuel in excess of air, or lean-burn combustion, is a promising alternative to conventional combustion, and can achieve these requirements simultaneously. However, lean-burn combustion poses new challenges, especially for internal combustion (IC) engines. Therefore, models used to predict such combustion have to be reliable, accurate and robust. In this work, the flamelet approach in the Reynolds-Averaged Navier- Stokes framework, is used to simulate flames relevant to spark-ignition IC engines. A central quantity in the current modelling approach is the scalar dissipation rate, which represents coupling between reaction and diffusion, as well as the flame front dynamics. In the first part of this thesis, the predictive ability of two reaction rate closures, viz. strained and unstrained flamelet models, are assessed through a series of experimental test cases. These cases are: spherically propagating methane- and hydrogen-air flames and combustion in a closed vessel. In addition to these models, simpler algebraic closures are also used for comparison. It is shown that the strained flamelet model can predict unconfined, spherically propagating methane-air flames reasonably well. By comparing spherical flame results with planar flames, under identical thermochemical and turbulence conditions, it is shown that the turbulent flame speed of spherical flames are 10 to 20% higher than that of planar flames, whilst the mean reaction rates are less influenced by the flame geometry. Growth of the flame brush thickness in unsteady spherical flames have been attributed to turbulent diffusion in past studies. However, the present analyses revealed that the dominant cause for this increase is the heat-release induced convective effects, which is a novel observation. Unlike methane-air flames, hydrogen-air flames have non-unity Lewis numbers. Hence, a novel two degrees of freedom approach, using two progress variables, is used to describe the thermochemistry of hydrogen-air flames. Again, it is shown that the strained flamelet model is able to predict the experimental flame growth for stoichiometric hydrogen-air flames. However, none of the models used in this work were able to predict lean hydrogen-air flames. This is because these flames are thermo-diffusively unstable and the current approach is inadequate to represent them. When combustion takes place inside a closed vessel, the compression of the end gases by the propagating flame causes the pressure to rise. This is more representative of real IC engines, where intermittent combustion takes place. The combustion models are implemented in a commercial computational fluid dynamics (CFD) code, STAR-CD, and it is shown that both strained and unstrained flamelet models are able to predict the experimental pressure rise in a closed vessel. In the final part of this work, a spark-ignition engine is simulated in STAR-CD using the flamelet model verified for…

Subjects/Keywords: Computational fluid dynamics; Turbulent combustion; Spark-ignition engines

9 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ahmed, I. (2014). Simulation of turbulent flames relevant to spark-ignition engines. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/245288https://www.repository.cam.ac.uk/bitstream/1810/245288/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/245288/4/thesis_ahmed.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/5/thesis_ahmed.pdf.jpg

Chicago Manual of Style (16^th Edition):

Ahmed, Irufan. “Simulation of turbulent flames relevant to spark-ignition engines.” 2014. Doctoral Dissertation, University of Cambridge. Accessed March 05, 2021. https://www.repository.cam.ac.uk/handle/1810/245288https://www.repository.cam.ac.uk/bitstream/1810/245288/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/245288/4/thesis_ahmed.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/5/thesis_ahmed.pdf.jpg.

MLA Handbook (7^th Edition):

Ahmed, Irufan. “Simulation of turbulent flames relevant to spark-ignition engines.” 2014. Web. 05 Mar 2021.

Vancouver:

Ahmed I. Simulation of turbulent flames relevant to spark-ignition engines. [Internet] [Doctoral dissertation]. University of Cambridge; 2014. [cited 2021 Mar 05]. Available from: https://www.repository.cam.ac.uk/handle/1810/245288https://www.repository.cam.ac.uk/bitstream/1810/245288/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/245288/4/thesis_ahmed.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/5/thesis_ahmed.pdf.jpg.

Council of Science Editors:

Ahmed I. Simulation of turbulent flames relevant to spark-ignition engines. [Doctoral Dissertation]. University of Cambridge; 2014. Available from: https://www.repository.cam.ac.uk/handle/1810/245288https://www.repository.cam.ac.uk/bitstream/1810/245288/2/license.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/3/license_rdf ; https://www.repository.cam.ac.uk/bitstream/1810/245288/4/thesis_ahmed.pdf.txt ; https://www.repository.cam.ac.uk/bitstream/1810/245288/5/thesis_ahmed.pdf.jpg

Cranfield University

11. Berckmuller, Martin. A study of mixture formation in a lean burn research engine using laser fluorescence imaging.

Degree: PhD, 1996, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/10431 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309838

► Lean burn in spark-ignition engines offers a significant efficiency advantage compared with stoichiometric operation. The lean operation is restricted by increasing cyclic fluctuation in torque.… (more)

▼ Lean burn in spark-ignition engines offers a significant efficiency advantage compared with stoichiometric operation. The lean operation is restricted by increasing cyclic fluctuation in torque. In order to make use of the efficiency advantage and meet the mandatory emission standards the lean operation limit has to be further extended. This requires particular control of the mixing of fuel and air. To study the effect of mixture formation on cyclic variability and to provide quantitative information on the mixing of air and fuel planar laser-induced fluorescence (PLIF) was developed and applied to an operating SI engine. The method is based on imaging the fluorescence of a fluorescent marker (3-pentanone) mixed with the fuel (iso-octane). 3-pentanone was found to have similar vaporisation characteristics to those of iso-octane as well as low absorption and suitable spectral properties. The technique was applied to an one-cylinder SI engine with a cylinder head configuration based on the Honda VTEC-E lean burn system. The mixture formation process during the inlet and compression stroke could be described by measuring the average fuel concentration in four planes, between 0.7 and 15.2 mm below the spark plug, in a section of the cylinder orthogonal to the cylinder axis. The results showed that for 4-valve pent-roof cylinder head systems with swirl inlet flows, fuel impinging on the cylinder wall opposite to the inlet valves has a major influence on the mixture formation process. In order to quantify the cyclic variability in the mixture formation process and its contribution to cyclic variability in combustion the fuel concentration in a plane near the spark plug was measured on a large number of cycles. It could be shown, that the fuel concentration in a small region close to the spark plug has a dominating effect on the subsequent pressure development for lean mixtures. Variations in the mixture concentration in the vicinity of the spark plug contribute significantly to cyclic variations in combustion. In order to address the issue of no uniformity in residual gas concentration prior to ignition a laser induced fluorescence method was developed to measure nitric oxide (NO) concentrations in the unburned charge in the same one-cylinder research engine. Measurements of average and instantaneous NO concentrations revealed, that the residual gas is not homogeneously mixed with the air and that significant cyclic variations in the local residual gas concentration exist.

Subjects/Keywords: 621.43; Spark-ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Berckmuller, M. (1996). A study of mixture formation in a lean burn research engine using laser fluorescence imaging. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/10431 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309838

Chicago Manual of Style (16^th Edition):

Berckmuller, Martin. “A study of mixture formation in a lean burn research engine using laser fluorescence imaging.” 1996. Doctoral Dissertation, Cranfield University. Accessed March 05, 2021. http://dspace.lib.cranfield.ac.uk/handle/1826/10431 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309838.

MLA Handbook (7^th Edition):

Berckmuller, Martin. “A study of mixture formation in a lean burn research engine using laser fluorescence imaging.” 1996. Web. 05 Mar 2021.

Vancouver:

Berckmuller M. A study of mixture formation in a lean burn research engine using laser fluorescence imaging. [Internet] [Doctoral dissertation]. Cranfield University; 1996. [cited 2021 Mar 05]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10431 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309838.

Council of Science Editors:

Berckmuller M. A study of mixture formation in a lean burn research engine using laser fluorescence imaging. [Doctoral Dissertation]. Cranfield University; 1996. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/10431 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309838

University of Oxford

12. Ma, Hongrui. Optical diagnostics and combustion analysis in a gasoline direct injection engine.

Degree: PhD, 2006, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:46364c15-08d3-4984-af3b-819ef0bdc847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442828

► Gasoline Direct Injection (GDI) engines work with stratified charge at part load and burn with lean mixtures in order to save fuel, whilst at full… (more)

▼ Gasoline Direct Injection (GDI) engines work with stratified charge at part load and burn with lean mixtures in order to save fuel, whilst at full load, the fuel and air mix homogeneously for maximum power output. The higher compression ratio and the absence of throttling are two of the most significant benefits of GDI engines. The key issues facing GDI combustion include in-cylinder mixture preparation and post-combustion soot formation. This work was intended to investigate these aspects and was undertaken on a dedicated Jaguar single-cylinder optical GDI engine with a spray-guided combustion system. The spray-guided concept does not rely as much on charge motion or piston design, and can avoid wall-wetting effects so as to reduce engine emissions. Relevant engine control hardware and data acquisition equipment were commissioned. Data/image processing software was also developed to suit the measurements. A data-processing case study with data from a small two-stroke glow ignition engine has been conducted to develop a method to combine the burn rate and heat release analyses in the study of engines with premixed charge but compression ignition. Difficulties such as unknown ignition timing and polytropic index have been addressed. Results for all operating conditions have shown good correlations between the two methods. The technique of quantitative planar laser-induced fluorescence is useful for measuring 2-D fuel distribution in GDI engines. The relevant physics and literature were reviewed in depth. A multi-component fuel was designed to give reasonable co-evaporation characteristics with tracers matching different fuel fractions. The absorption and fluorescence features of each fuel component and tracer were characterised. Optimisation of hardware and signal-to-noise ratio was performed. A recirculating loop was set up for the calibration of the technique. The technique of colour-ratio pyrometry (CRP) for estimating the temperature and loading of soot was applied on the GDI engine. Critical features of the candidate CCD colour camera including its spectral response and noise behaviours were fully studied. Validation tests with reference sources together with an error analysis suggested an accuracy of ±50K within the combustion temperature range. Engine combustion images were then taken under various operating conditions. Temperature estimates were shown to be insensitive to the concentration of soot. Simulation with a thermodynamic modelling package, ISIS, was introduced for comparison with the experimental data. With careful tuning, ISIS gave outputs comparable to the CRP and proved to be a cost-effective tool to study GDI engines. High-speed combustion imaging was carried out using a CMOS camera, allowing the study of flame properties as well as crank-angle resolved CRP. By using a lens in the piston crown to give full bore optical access and appropriate image processing, the flame front could be detected reliably throughout the main combustion process.

Subjects/Keywords: 629.2504; Spark ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ma, H. (2006). Optical diagnostics and combustion analysis in a gasoline direct injection engine. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:46364c15-08d3-4984-af3b-819ef0bdc847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442828

Chicago Manual of Style (16^th Edition):

Ma, Hongrui. “Optical diagnostics and combustion analysis in a gasoline direct injection engine.” 2006. Doctoral Dissertation, University of Oxford. Accessed March 05, 2021. http://ora.ox.ac.uk/objects/uuid:46364c15-08d3-4984-af3b-819ef0bdc847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442828.

MLA Handbook (7^th Edition):

Ma, Hongrui. “Optical diagnostics and combustion analysis in a gasoline direct injection engine.” 2006. Web. 05 Mar 2021.

Vancouver:

Ma H. Optical diagnostics and combustion analysis in a gasoline direct injection engine. [Internet] [Doctoral dissertation]. University of Oxford; 2006. [cited 2021 Mar 05]. Available from: http://ora.ox.ac.uk/objects/uuid:46364c15-08d3-4984-af3b-819ef0bdc847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442828.

Council of Science Editors:

Ma H. Optical diagnostics and combustion analysis in a gasoline direct injection engine. [Doctoral Dissertation]. University of Oxford; 2006. Available from: http://ora.ox.ac.uk/objects/uuid:46364c15-08d3-4984-af3b-819ef0bdc847 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442828

Clemson University

13. Siokos, Konstantinos. Low-Pressure EGR in Spark-Ignition Engines: Combustion Effects, System Optimization, Transients & Estimation Algorithms.

Degree: PhD, Automotive Engineering, 2017, Clemson University

URL: https://tigerprints.clemson.edu/all_dissertations/1983

► Low-displacement turbocharged spark-ignition engines have become the dominant choice of auto makers in the effort to meet the increasingly stringent emission regulations and fuel… (more)

▼ Low-displacement turbocharged spark-ignition engines have become the dominant choice of auto makers in the effort to meet the increasingly stringent emission regulations and fuel efficiency targets. Low-Pressure cooled Exhaust Gas Recirculation introduces important efficiency benefits and complements the shortcomings of highly boosted engines. The main drawback of these configurations is the long air-path which may cause over-dilution limitations during transient operation. The pulsating exhaust environment and the low available pressure differential to drive the recirculation impose additional challenges with respect to feed-forward EGR estimation accuracy. For these reasons, these systems are currently implemented through calibration with less-than-optimum EGR dilution in order to ensure stable operation under all conditions. However, this technique introduces efficiency penalties. Aiming to exploit the full potential of this technology, the goal is to address these challenges and allow operation with near-optimum EGR dilution. This study is focused on three major areas regarding the implementation of Low-Pressure EGR systems:  Combustion effects, benefits and constraints  System optimization and transient operation  Estimation and adaptation Results from system optimization show that fuel efficiency benefits range from 2% – 3% over drive cycles through pumping and heat loss reduction, and up to 16% or more at higher loads through knock mitigation and fuel enrichment elimination. Soot emissions are also significantly reduced with cooled EGR. Regarding the transient challenges, a methodology that correlates experimental data with simulation results is developed to identify over-dilution limitations related to the engine’s dilution tolerance. Different strategies are proposed to mitigate these issues, including a Neural Network-actuated VVT that controls the internal residual and increases the over-dilution tolerance by 3% of absolute EGR. Physics-based estimation algorithms are also developed, including an exhaust pressure/temperature model which is validated through real-time transient experiments and eliminates the need for exhaust sensors. Furthermore, the installation of an intake oxygen sensor is investigated and an adaptation algorithm based on an Extended Kalman Filter is created. This algorithm delivers short-term and long-term corrections to feed-forward EGR models achieving a final estimation error of less than 1%. The combination of the proposed methodologies, strategies and algorithms allows the implementation of near-optimum EGR dilution and translates to fuel efficiency benefits ranging from 1% at low-load up to 10% at high-load operation over the current state-of-the-art. Advisors/Committee Members: Dr. Robert Prucka, Committee Chair, Dr. Zoran Filipi, Committee Co-Chair, Dr. Mark Hoffman, Dr. Simona Onori.

Subjects/Keywords: adaptation; estimation; exhaust gas recirculation; low pressure; optimization; spark-ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Siokos, K. (2017). Low-Pressure EGR in Spark-Ignition Engines: Combustion Effects, System Optimization, Transients & Estimation Algorithms. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1983

Chicago Manual of Style (16^th Edition):

Siokos, Konstantinos. “Low-Pressure EGR in Spark-Ignition Engines: Combustion Effects, System Optimization, Transients & Estimation Algorithms.” 2017. Doctoral Dissertation, Clemson University. Accessed March 05, 2021. https://tigerprints.clemson.edu/all_dissertations/1983.

MLA Handbook (7^th Edition):

Siokos, Konstantinos. “Low-Pressure EGR in Spark-Ignition Engines: Combustion Effects, System Optimization, Transients & Estimation Algorithms.” 2017. Web. 05 Mar 2021.

Vancouver:

Siokos K. Low-Pressure EGR in Spark-Ignition Engines: Combustion Effects, System Optimization, Transients & Estimation Algorithms. [Internet] [Doctoral dissertation]. Clemson University; 2017. [cited 2021 Mar 05]. Available from: https://tigerprints.clemson.edu/all_dissertations/1983.

Council of Science Editors:

Siokos K. Low-Pressure EGR in Spark-Ignition Engines: Combustion Effects, System Optimization, Transients & Estimation Algorithms. [Doctoral Dissertation]. Clemson University; 2017. Available from: https://tigerprints.clemson.edu/all_dissertations/1983

14. Ahmed, Irufan. Simulation of turbulent flames relevant to spark-ignition engines.

Degree: PhD, 2014, University of Cambridge

URL: https://doi.org/10.17863/CAM.14074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607579

► Combustion research currently aims to reduce emissions, whilst improving the fuel economy. Burning fuel in excess of air, or lean-burn combustion, is a promising alternative… (more)

▼ Combustion research currently aims to reduce emissions, whilst improving the fuel economy. Burning fuel in excess of air, or lean-burn combustion, is a promising alternative to conventional combustion, and can achieve these requirements simultaneously. However, lean-burn combustion poses new challenges, especially for internal combustion (IC) engines. Therefore, models used to predict such combustion have to be reliable, accurate and robust. In this work, the flamelet approach in the Reynolds-Averaged Navier- Stokes framework, is used to simulate flames relevant to spark-ignition IC engines. A central quantity in the current modelling approach is the scalar dissipation rate, which represents coupling between reaction and diffusion, as well as the flame front dynamics. In the first part of this thesis, the predictive ability of two reaction rate closures, viz. strained and unstrained flamelet models, are assessed through a series of experimental test cases. These cases are: spherically propagating methane- and hydrogen-air flames and combustion in a closed vessel. In addition to these models, simpler algebraic closures are also used for comparison. It is shown that the strained flamelet model can predict unconfined, spherically propagating methane-air flames reasonably well. By comparing spherical flame results with planar flames, under identical thermochemical and turbulence conditions, it is shown that the turbulent flame speed of spherical flames are 10 to 20% higher than that of planar flames, whilst the mean reaction rates are less influenced by the flame geometry. Growth of the flame brush thickness in unsteady spherical flames have been attributed to turbulent diffusion in past studies. However, the present analyses revealed that the dominant cause for this increase is the heat-release induced convective effects, which is a novel observation. Unlike methane-air flames, hydrogen-air flames have non-unity Lewis numbers. Hence, a novel two degrees of freedom approach, using two progress variables, is used to describe the thermochemistry of hydrogen-air flames. Again, it is shown that the strained flamelet model is able to predict the experimental flame growth for stoichiometric hydrogen-air flames. However, none of the models used in this work were able to predict lean hydrogen-air flames. This is because these flames are thermo-diffusively unstable and the current approach is inadequate to represent them. When combustion takes place inside a closed vessel, the compression of the end gases by the propagating flame causes the pressure to rise. This is more representative of real IC engines, where intermittent combustion takes place. The combustion models are implemented in a commercial computational fluid dynamics (CFD) code, STAR-CD, and it is shown that both strained and unstrained flamelet models are able to predict the experimental pressure rise in a closed vessel. In the final part of this work, a spark-ignition engine is simulated in STAR-CD using the flamelet model verified for simpler geometries. It is…

Subjects/Keywords: 621.402; Computational fluid dynamics; Turbulent combustion; Spark-ignition engines

9 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ahmed, I. (2014). Simulation of turbulent flames relevant to spark-ignition engines. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.14074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607579

Chicago Manual of Style (16^th Edition):

Ahmed, Irufan. “Simulation of turbulent flames relevant to spark-ignition engines.” 2014. Doctoral Dissertation, University of Cambridge. Accessed March 05, 2021. https://doi.org/10.17863/CAM.14074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607579.

MLA Handbook (7^th Edition):

Ahmed, Irufan. “Simulation of turbulent flames relevant to spark-ignition engines.” 2014. Web. 05 Mar 2021.

Vancouver:

Ahmed I. Simulation of turbulent flames relevant to spark-ignition engines. [Internet] [Doctoral dissertation]. University of Cambridge; 2014. [cited 2021 Mar 05]. Available from: https://doi.org/10.17863/CAM.14074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607579.

Council of Science Editors:

Ahmed I. Simulation of turbulent flames relevant to spark-ignition engines. [Doctoral Dissertation]. University of Cambridge; 2014. Available from: https://doi.org/10.17863/CAM.14074 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607579

Michigan State University

15. Gu, Mengyan. Modeling and control of a Gasoline Direct Injection fuel system.

Degree: 2015, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:3614

►

Fuel economy and emissions are the two main concerns to many automobile engineers. The Gasoline Direct Injection (GDI) fuel systems are widely used in internal… (more)

Subjects/Keywords: Automobiles – Motors – Fuel injection systems; Spark ignition engines – Technological innovations; Engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gu, M. (2015). Modeling and control of a Gasoline Direct Injection fuel system. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3614

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gu, Mengyan. “Modeling and control of a Gasoline Direct Injection fuel system.” 2015. Thesis, Michigan State University. Accessed March 05, 2021. http://etd.lib.msu.edu/islandora/object/etd:3614.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gu, Mengyan. “Modeling and control of a Gasoline Direct Injection fuel system.” 2015. Web. 05 Mar 2021.

Vancouver:

Gu M. Modeling and control of a Gasoline Direct Injection fuel system. [Internet] [Thesis]. Michigan State University; 2015. [cited 2021 Mar 05]. Available from: http://etd.lib.msu.edu/islandora/object/etd:3614.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gu M. Modeling and control of a Gasoline Direct Injection fuel system. [Thesis]. Michigan State University; 2015. Available from: http://etd.lib.msu.edu/islandora/object/etd:3614

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

The Ohio State University

16. Frederick, John David. Time-Resolved In-Cylinder Heat Transfer and its Implications on Knock in Spark Ignition Engines.

Degree: MS, Mechanical Engineering, 2015, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1437648508

► Spark Ignition (SI) engines power 96.6% of light duty vehicles produced in North America in 2013, yet the ability to increase their efficiency through strategies… (more)

▼ Spark Ignition (SI) engines power 96.6% of light duty vehicles produced in North America in 2013, yet the ability to increase their efficiency through strategies such as boosting or increasing the compression ratio is limited by knock. Knock, or the autoignition of the fuel and air mixture ahead of the flame front, is dictated by chemical kinetics and the rates of the reactions leading to autoignition are determined by the Boltzmann factor, which is exponentially dependent on the local gas temperature. The gas temperature is a function of both the heat release from combustion and the in-cylinder heat transfer. Therefore, to predict knock and operate SI engines as efficiently as possible, it is necessary to accurately model the in-cylinder heat transfer process. Hence, the objective of the present study is to improve the understanding of in-cylinder heat transfer of SI engines.Time-resolved in-cylinder heat transfer was measured in cylinder4 of a Chrysler 2.0L I4 engine using Vatell Heat Flux Microsensors (HFMs) along with pressure measurements within the combustion chamber and in the intake runner and plenum as well as the exhaust runner. Firing engine experiments were first performed with a single heat flux sensor at 1600 and 2400 RPM wide open throttle (WOT). Carbon deposits built up on the HFM surface, necessitating the development of a sensor cleaning procedure using acetone as a solvent. An approximate pressure limit of 50 bar for the HFM was also determined with this cylinder head. Motored engine experiments were then performed with a multi-sensor cylinder head with two HFMs at 1200, 1600, 2000, 2400, and 3000 RPM WOT and the peak heat flux was observed to increase with increasing engine speed. Despite negligible variation of the in-cylinder pressure from cycle-to-cycle, cyclic variation of heat flux was significant at both measurement locations. Firing experiments with the multi-sensor cylinder head were completed at 1200, 1600, and 2000 RPM WOT. Significant spatial differences in heat flux were observed between the two measurement locations for firing operation. Peak heat flux measured between the intake and exhaust valves (HFM3) was 49% higher on average than at the intake bridge (HFM1) while also reaching peak magnitude earlier. Average flame propagation speeds in the direction of HFM3 were on average 46% higher than towards HFM1 as well. Similar to the motored experiments, high cyclic variability of heat flux was observed for all firing experiments. Even with considerable cycle-to-cycle variation, average in-cylinder pressure and heat flux measurements were found to be quite repeatable.Detailed 3D CFD simulations of cylinder #4 for motored and firing operation were performed at 1600 RPM WOT using CONVERGE CFD software. Predicted pressure and heat flux for motored operation matched the experimental results well. For the firing engine, combustion was modeled using a kinetics mechanism for a primary reference fuel blend (PRF 91). Both the predicted cylinder pressure and heat flux showed good agreement with… Advisors/Committee Members: Selamet, Ahmet (Advisor).

Subjects/Keywords: Mechanical Engineering; Knock; Heat Transfer; Spark Ignition Engines; Combustion

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Frederick, J. D. (2015). Time-Resolved In-Cylinder Heat Transfer and its Implications on Knock in Spark Ignition Engines. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1437648508

Chicago Manual of Style (16^th Edition):

Frederick, John David. “Time-Resolved In-Cylinder Heat Transfer and its Implications on Knock in Spark Ignition Engines.” 2015. Masters Thesis, The Ohio State University. Accessed March 05, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437648508.

MLA Handbook (7^th Edition):

Frederick, John David. “Time-Resolved In-Cylinder Heat Transfer and its Implications on Knock in Spark Ignition Engines.” 2015. Web. 05 Mar 2021.

Vancouver:

Frederick JD. Time-Resolved In-Cylinder Heat Transfer and its Implications on Knock in Spark Ignition Engines. [Internet] [Masters thesis]. The Ohio State University; 2015. [cited 2021 Mar 05]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1437648508.

Council of Science Editors:

Frederick JD. Time-Resolved In-Cylinder Heat Transfer and its Implications on Knock in Spark Ignition Engines. [Masters Thesis]. The Ohio State University; 2015. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1437648508

Michigan State University

17. Zhang, Shupeng. Modeling and mode transition control of an HCCI capable Si engine.

Degree: 2014, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:2492

►

Thesis Ph. D. Michigan State University. Mechanical Engineering 2014.

While the homogeneous charge compression ignition (HCCI) combustion has its advantages of high thermal efficiency with… (more)

▼

Thesis Ph. D. Michigan State University. Mechanical Engineering 2014.

While the homogeneous charge compression ignition (HCCI) combustion has its advantages of high thermal efficiency with low emissions, its operational range is limited in both engine speed and load. To utilize the advantage of the HCCI combustion an HCCI capable SI (spark ignition) engine is required. One of the key challenges of developing such an engine is to achieve smooth mode transition between SI and HCCI combustion, where the in-cylinder thermal and charge mixture properties are quite different due to the distinct combustion characteristics. In this research, mode transition between SI and HCCI combustion was investigated for an HCCI capable SI engine equipped with electrical variable valve timing (EVVT) systems, dual-lift valves and electronic throttle control (ETC) system. For the purpose of reducing research cost and development duration, one of the most efficient approaches is to develop and validate the control strategy using an HIL (hardware-in-the-loop) simulation environment, where the real engine is replaced by a control-oriented real-time engine model. This dissertation describes a two-zone HCCI combustion model, where the in-cylinder charge is divided into the well-mixed and unmixed zones as the result of charge mixing. Simplified fluid dynamics is used to predict the residual gas fraction before the combustion phase starts, which defines the mass of the unmixed zone, during real-time simulations. The unmixed zone size not only determines how well the in-cylinder charge is mixed, which affects the start of HCCI combustion, but also the resulting peak in-cylinder pressure and temperature during the combustion process. The developed model was validated in the HIL simulation and experiments.To achieve smooth combustion mode transition, the throttle position needs to be controlled accurately with fast response. In this dissertation, an electronic throttle control (ETC) system was modeled as an LPV (linear parameter varying) system in discrete-time domain, where the nonlinearities are modeled as varying parameter or compensated through feed-forward control. Mixed constrained H2/Hinf LPV controller was designed to achieve the best performance and also guarantee the system robustness. Then a model-based mode transition control strategy between SI and HCCI combustion was developed and experimentally validated for an HCCI capable SI engine equipped with electrical variable valve timing (EVVT) systems, dual-lift valves and ETC system. During the mode transition, a manifold air pressure controller was used to track the desired intake manifold pressure for managing the charge air; and an iterative learning fuel mass controller, combined with sensitivity-based compensation, was used to manage the engine torque in terms of net effective mean pressure, an indicator of engine output torque, at the desired level for smooth mode transition. Experiment results show that the developed controller is able to achieve smooth combustion mode transition…

Advisors/Committee Members: Zhu, Guoming, Khalil, Hassan, Schock, Harold, Choi, Jongeun.

Subjects/Keywords: Mechanical engineering; Internal combustion engines – Combustion; Spark ignition engines – Combustion; Hardware-in-the-loop simulation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, S. (2014). Modeling and mode transition control of an HCCI capable Si engine. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:2492

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhang, Shupeng. “Modeling and mode transition control of an HCCI capable Si engine.” 2014. Thesis, Michigan State University. Accessed March 05, 2021. http://etd.lib.msu.edu/islandora/object/etd:2492.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhang, Shupeng. “Modeling and mode transition control of an HCCI capable Si engine.” 2014. Web. 05 Mar 2021.

Vancouver:

Zhang S. Modeling and mode transition control of an HCCI capable Si engine. [Internet] [Thesis]. Michigan State University; 2014. [cited 2021 Mar 05]. Available from: http://etd.lib.msu.edu/islandora/object/etd:2492.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang S. Modeling and mode transition control of an HCCI capable Si engine. [Thesis]. Michigan State University; 2014. Available from: http://etd.lib.msu.edu/islandora/object/etd:2492

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan State University

18. Srivastava, Shalabh. Numerical simulation of a direct injection spark ignition engine using ethanol as fuel.

Degree: MS, Department of Mechanical Engineering, 2008, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:39239

Subjects/Keywords: Spark ignition engines – Alternative fuels; Spark ignition engines – Mathematical models; Alcohol as fuel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Srivastava, S. (2008). Numerical simulation of a direct injection spark ignition engine using ethanol as fuel. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:39239

Chicago Manual of Style (16^th Edition):

Srivastava, Shalabh. “Numerical simulation of a direct injection spark ignition engine using ethanol as fuel.” 2008. Masters Thesis, Michigan State University. Accessed March 05, 2021. http://etd.lib.msu.edu/islandora/object/etd:39239.

MLA Handbook (7^th Edition):

Srivastava, Shalabh. “Numerical simulation of a direct injection spark ignition engine using ethanol as fuel.” 2008. Web. 05 Mar 2021.

Vancouver:

Srivastava S. Numerical simulation of a direct injection spark ignition engine using ethanol as fuel. [Internet] [Masters thesis]. Michigan State University; 2008. [cited 2021 Mar 05]. Available from: http://etd.lib.msu.edu/islandora/object/etd:39239.

Council of Science Editors:

Srivastava S. Numerical simulation of a direct injection spark ignition engine using ethanol as fuel. [Masters Thesis]. Michigan State University; 2008. Available from: http://etd.lib.msu.edu/islandora/object/etd:39239

NSYSU

19. Chen, Chung-ying. Low-Emission Engine and Fuel Technology for Motorcycle.

Degree: PhD, Mechanical and Electro-Mechanical Engineering, 2013, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0201113-161410

► The purpose of this research is to apply an adaptive fuel injection control algorithm on a motorcycle engine and evaluate its performance. A highly nonlinear… (more)

Subjects/Keywords: SI engines; motorcycle; spark-ignition engine; Fuel Injection system; nonlinear control; water-fuel emulsions

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, C. (2013). Low-Emission Engine and Fuel Technology for Motorcycle. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0201113-161410

Chicago Manual of Style (16^th Edition):

Chen, Chung-ying. “Low-Emission Engine and Fuel Technology for Motorcycle.” 2013. Doctoral Dissertation, NSYSU. Accessed March 05, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0201113-161410.

MLA Handbook (7^th Edition):

Chen, Chung-ying. “Low-Emission Engine and Fuel Technology for Motorcycle.” 2013. Web. 05 Mar 2021.

Vancouver:

Chen C. Low-Emission Engine and Fuel Technology for Motorcycle. [Internet] [Doctoral dissertation]. NSYSU; 2013. [cited 2021 Mar 05]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0201113-161410.

Council of Science Editors:

Chen C. Low-Emission Engine and Fuel Technology for Motorcycle. [Doctoral Dissertation]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0201113-161410

Universidade Estadual de Campinas

20. Santos Júnior, Francisco Renato dos, 1990-. Estudo de um modelo computacional para prever a ocorrência da detonação em um motor avançado a etanol: Study of computer model to predict the knock occurence on an advanced ethanol engine.

Degree: 2017, Universidade Estadual de Campinas

URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/330729

► Abstract: In this work it is presented a method for the prediction of the onset knock phenomenon on a spark ignition engine operating with hydrous… (more)

Subjects/Keywords: Detonação; Combustão; Etanol hidratado; Motores de combustão interna; Knock; Combustion; Hydrous Ethanol; Spark ignition engines

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Santos Júnior, Francisco Renato dos, 1. (2017). Estudo de um modelo computacional para prever a ocorrência da detonação em um motor avançado a etanol: Study of computer model to predict the knock occurence on an advanced ethanol engine. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/330729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Santos Júnior, Francisco Renato dos, 1990-. “Estudo de um modelo computacional para prever a ocorrência da detonação em um motor avançado a etanol: Study of computer model to predict the knock occurence on an advanced ethanol engine.” 2017. Thesis, Universidade Estadual de Campinas. Accessed March 05, 2021. http://repositorio.unicamp.br/jspui/handle/REPOSIP/330729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Santos Júnior, Francisco Renato dos, 1990-. “Estudo de um modelo computacional para prever a ocorrência da detonação em um motor avançado a etanol: Study of computer model to predict the knock occurence on an advanced ethanol engine.” 2017. Web. 05 Mar 2021.

Vancouver:

Santos Júnior, Francisco Renato dos 1. Estudo de um modelo computacional para prever a ocorrência da detonação em um motor avançado a etanol: Study of computer model to predict the knock occurence on an advanced ethanol engine. [Internet] [Thesis]. Universidade Estadual de Campinas; 2017. [cited 2021 Mar 05]. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/330729.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Santos Júnior, Francisco Renato dos 1. Estudo de um modelo computacional para prever a ocorrência da detonação em um motor avançado a etanol: Study of computer model to predict the knock occurence on an advanced ethanol engine. [Thesis]. Universidade Estadual de Campinas; 2017. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/330729

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

21. Shekhawat, Yajuvendra Singh. Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine.

Degree: 2017, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/13827yss107

► Cycle-to-cycle variations (CCV) of flow and combustion in internal combustion engines (ICE) limit their fuel efficiency and emissions potential. Large-eddy simulation (LES) is the most… (more)

▼ Cycle-to-cycle variations (CCV) of flow and combustion in internal combustion engines (ICE) limit their fuel efficiency and emissions potential. Large-eddy simulation (LES) is the most practical simulation tool to understand the nature of these CCV. In this research, multi-cycle LES of a two-valve, four-stroke, spark- ignition optical engine has been performed for motored and fired operations. The LES mesh quality is assessed using a length scale resolution parameter and a energy resolution parameter. For the motored operation, two 50-consecutive-cycle LES with different turbulence models (Smagorinsky model and dynamic structure model) are compared with the experiment. The pressure comparison shows that the LES is able to capture the wave-dynamics in the intake and exhaust ports. The LES velocity fields are compared with particle-image velocimetry (PIV) measurements at three cutting planes. Based on the structure and magnitude indices, the dynamic structure model is somewhat better than the Smagorinsky model as far as the ensemble-averaged velocity fields are concerned. The CCV in the velocity fields is assessed by proper-orthogonal decomposition (POD). The POD analysis shows that LES is able to capture the level of CCV seen in the experiment. For the fired operation, two 60-cycle LES with different combustion models (thickened flame model and coherent flame model) are compared with experiment. The in-cylinder pressure and the apparent heat release rate comparison shows higher CCV for LES compared to the experiment, with the thickened flame model showing higher CCV than the coherent flame model. The correlation analysis for the LES using thickened flame model shows that the CCV in combustion/pressure is correlated with: the tumble at the intake valve closing, the resolved and subfilter-scale kinetic energy just before spark time, and the second POD mode (shear flow near spark gap) of the velocity fields just before spark time. Advisors/Committee Members: Daniel Connell Haworth, Dissertation Advisor/Co-Advisor, Daniel Connell Haworth, Committee Chair/Co-Chair, Stephen Turns, Committee Member, Robert Santoro, Committee Member, Philip John Morris, Outside Member.

Subjects/Keywords: Spark-ignition engines; Cycle-to-cycle variations; Large-eddy simulations; Thickened flame model

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shekhawat, Y. S. (2017). Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/13827yss107

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shekhawat, Yajuvendra Singh. “Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine.” 2017. Thesis, Penn State University. Accessed March 05, 2021. https://submit-etda.libraries.psu.edu/catalog/13827yss107.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shekhawat, Yajuvendra Singh. “Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine.” 2017. Web. 05 Mar 2021.

Vancouver:

Shekhawat YS. Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Mar 05]. Available from: https://submit-etda.libraries.psu.edu/catalog/13827yss107.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shekhawat YS. Large-Eddy Simulations of Motored Flow and Combustion in a Homogeneous-Charge Spark-Ignition Engine. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/13827yss107

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

22. Zhang, Yingqiang. Induction and exhaust system optimisation for the Scotch-Yoke engine.

Degree: 1996, University of Melbourne

URL: http://hdl.handle.net/11343/36082

► A mathematical model for flow and combustion has been modified, including basic revision, and applied for the power output optimisation of valve timing and intake… (more)

Subjects/Keywords: spark ignition engines; simulation methods; automobiles

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, Y. (1996). Induction and exhaust system optimisation for the Scotch-Yoke engine. (Masters Thesis). University of Melbourne. Retrieved from http://hdl.handle.net/11343/36082

Chicago Manual of Style (16^th Edition):

Zhang, Yingqiang. “Induction and exhaust system optimisation for the Scotch-Yoke engine.” 1996. Masters Thesis, University of Melbourne. Accessed March 05, 2021. http://hdl.handle.net/11343/36082.

MLA Handbook (7^th Edition):

Zhang, Yingqiang. “Induction and exhaust system optimisation for the Scotch-Yoke engine.” 1996. Web. 05 Mar 2021.

Vancouver:

Zhang Y. Induction and exhaust system optimisation for the Scotch-Yoke engine. [Internet] [Masters thesis]. University of Melbourne; 1996. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/11343/36082.

Council of Science Editors:

Zhang Y. Induction and exhaust system optimisation for the Scotch-Yoke engine. [Masters Thesis]. University of Melbourne; 1996. Available from: http://hdl.handle.net/11343/36082

Michigan State University

23. Huisjen, Andrew Michael. 1-D simulation of HCCI engine performance using knock-integral ignition prediction with Wiebe function combustion modeling, and comparison to advanced SI engine performance.

Degree: MS, Mechanical Engineering, 2010, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:12473

Subjects/Keywords: Spark ignition engines – Fuel consumption – Testing

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Huisjen, A. M. (2010). 1-D simulation of HCCI engine performance using knock-integral ignition prediction with Wiebe function combustion modeling, and comparison to advanced SI engine performance. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:12473

Chicago Manual of Style (16^th Edition):

Huisjen, Andrew Michael. “1-D simulation of HCCI engine performance using knock-integral ignition prediction with Wiebe function combustion modeling, and comparison to advanced SI engine performance.” 2010. Masters Thesis, Michigan State University. Accessed March 05, 2021. http://etd.lib.msu.edu/islandora/object/etd:12473.

MLA Handbook (7^th Edition):

Huisjen, Andrew Michael. “1-D simulation of HCCI engine performance using knock-integral ignition prediction with Wiebe function combustion modeling, and comparison to advanced SI engine performance.” 2010. Web. 05 Mar 2021.

Vancouver:

Huisjen AM. 1-D simulation of HCCI engine performance using knock-integral ignition prediction with Wiebe function combustion modeling, and comparison to advanced SI engine performance. [Internet] [Masters thesis]. Michigan State University; 2010. [cited 2021 Mar 05]. Available from: http://etd.lib.msu.edu/islandora/object/etd:12473.

Council of Science Editors:

Huisjen AM. 1-D simulation of HCCI engine performance using knock-integral ignition prediction with Wiebe function combustion modeling, and comparison to advanced SI engine performance. [Masters Thesis]. Michigan State University; 2010. Available from: http://etd.lib.msu.edu/islandora/object/etd:12473

Michigan State University

24. Chen, Xuefei. Control applications to biofuel engines.

Degree: 2012, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:732

►

Thesis Ph. D. Michigan State University, Mechanical Engineering 2012.

ABSTRACTCONTROL APPLICATIONS TO BIOFUEL ENGINESByXuefei ChenBiofuel, a form of renewable fuel, has promising future, especially as… (more)

▼

Thesis Ph. D. Michigan State University, Mechanical Engineering 2012.

ABSTRACTCONTROL APPLICATIONS TO BIOFUEL ENGINESByXuefei ChenBiofuel, a form of renewable fuel, has promising future, especially as the alternative fuel for transportation. Biofuel is usually blended with petroleum fuel and used in flex fuel engines. Since the characteristics of biofuel are quite different from those of the petroleum based fuel, it is very important to optimize the combustion properties for biofuel engines under different fuel blends. This research focuses on biofuel content detection and combustion control of biofuel engines under different biofuel contents. The first part of this research is the utilization of the ionic polymer-metal composite (IPMC) material as a sensing element of a flow and fluid property sensor for flex fuel engines. It is motivated by the IPMC's intrinsic sensing characteristic that an IPMC beam is capable of producing an electric signal closely correlated to its mechanical movement due to the redistribution of mobile ions inside the IPMC material. The IPMC beam is modeled as multiple rigid elements connected by rotational springs and dampers in this study. The fluid properties are estimated by using the least-squares approach based upon the developed finite element model. The proposed estimation scheme was validated in experiments under different fluid media, and it was found that the estimated fluid properties have fairly good agreement with their actual values. This research is very important for automotive applications where the characteristics of the fuel blend need to be identified in real time.The second part of the research is targeted at the optimal tracking control of the desired air-to-fuel ratio (AFR) based upon adaptively estimated biofuel content for internal combustion engines equipped with the lean NOx trap (LNT) aftertreatment system. The biofuel content is adaptively estimated based upon the oxygen sensor signal. The engine system was approximated by a third order linear system. A linear quadratic optimal tracking controller was developed to track the desired engine AFR during the LNT regeneration period. The robust stability of the closed loop system with the biofuel content estimation is guaranteed over the entire biofuel content range by using the robust stability criteria for the LPV (linear parameter variation) system, where the biofuel gain and the engine speed are considered as the variable parameters. Several adaptive control schemes were studied through simulations, and then the selected control strategies were evaluated through dynamometer tests for a lean burn spark ignition (SI) engine. The best performance was achieved by the gain-scheduled adaptive scheme. The third part of the research is detection of the combustion phase and estimation of biodiesel content using traditional knock sensors. Existing approaches for the combustion phase detection of a diesel engine are mainly based upon the high cost in-cylinder pressure sensor. This study focuses on developing a method to…

Advisors/Committee Members: Zhu, Guoming, Schock, Harold, Choi, Jongeun, Strangas, Elias.

Subjects/Keywords: Biomass energy; Renewable natural resources; Spark ignition engines – Alternative fuels; Mechanical engineering

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, X. (2012). Control applications to biofuel engines. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:732

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Xuefei. “Control applications to biofuel engines.” 2012. Thesis, Michigan State University. Accessed March 05, 2021. http://etd.lib.msu.edu/islandora/object/etd:732.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Xuefei. “Control applications to biofuel engines.” 2012. Web. 05 Mar 2021.

Vancouver:

Chen X. Control applications to biofuel engines. [Internet] [Thesis]. Michigan State University; 2012. [cited 2021 Mar 05]. Available from: http://etd.lib.msu.edu/islandora/object/etd:732.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen X. Control applications to biofuel engines. [Thesis]. Michigan State University; 2012. Available from: http://etd.lib.msu.edu/islandora/object/etd:732

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

25. Modien, Russell Miles. The effects of enhanced ignition systems and turbulence on flame development.

Degree: MS, Department of Mechanical Engineering, 1991, University of Alberta

URL: https://era.library.ualberta.ca/files/rf55zb17x

Subjects/Keywords: Internal combustion engines – Combustion – Testing.; Spark ignition engines – Ignition.; Spark plugs.; Flame visualization.; Internal combustion engines – Ignition.

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Modien, R. M. (1991). The effects of enhanced ignition systems and turbulence on flame development. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/rf55zb17x

Chicago Manual of Style (16^th Edition):

Modien, Russell Miles. “The effects of enhanced ignition systems and turbulence on flame development.” 1991. Masters Thesis, University of Alberta. Accessed March 05, 2021. https://era.library.ualberta.ca/files/rf55zb17x.

MLA Handbook (7^th Edition):

Modien, Russell Miles. “The effects of enhanced ignition systems and turbulence on flame development.” 1991. Web. 05 Mar 2021.

Vancouver:

Modien RM. The effects of enhanced ignition systems and turbulence on flame development. [Internet] [Masters thesis]. University of Alberta; 1991. [cited 2021 Mar 05]. Available from: https://era.library.ualberta.ca/files/rf55zb17x.

Council of Science Editors:

Modien RM. The effects of enhanced ignition systems and turbulence on flame development. [Masters Thesis]. University of Alberta; 1991. Available from: https://era.library.ualberta.ca/files/rf55zb17x

University of Michigan

26. Natarajan, Vinod Kumar. Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines.

Degree: PhD, Mechanical engineering, 2006, University of Michigan

URL: http://hdl.handle.net/2027.42/126242

► Implementation of homogeneous charge compression ignition (HCCI) combustion in gasoline engines, while operating with improved fuel economy and reduced NOx emissions, is limited by the… (more)

▼ Implementation of homogeneous charge compression ignition (HCCI) combustion in gasoline engines, while operating with improved fuel economy and reduced NOx emissions, is limited by the inability to control combustion phasing. Spark-assisted compression ignition (SACI) is a mechanism that controls HCCI combustion phasing, using spark ignition to advance the onset of compression ignition (CI). SACI was employed at two light-load operating points (200 kPa and 300 kPa IMEP at fueling rates of 7 and 10 mg per cycle, respectively) to advance the phasing of a marginally-stable HCCI operating point. At the lower load, stratification by means of direct injection of 3 mg fuel at the time of spark ignition was required to advance phasing using SACI. At the higher load, robust SACI operation required less stratification (late injection of 1 mg). NOx emissions increased two- and four-fold in SACI relative to HCCI operation at the lower and higher load, respectively; this increase was shown to result primarily from the stratification. This study identified two issues confounding SACI, only observed at the lower load: cyclic variability in CI combustion phasing and inability to sufficiently advance phasing. To address these issues, new metrics were created in this study to identify four stages of the SACI combustion process: spark discharge, early kernel growth (EKG), flame propagation, and CI. Experiments were performed using an optical HCCI engine to simultaneously acquire steady-state emissions, in-cylinder pressure data, spark-discharge current and voltage waveforms, images of the plasma channel, and images of combustion chemiluminescence from two orthogonal views at sub-crank-angle resolution; these measurements were used to identify the four stages for each engine cycle and thereby the cyclic variability of each stage. It was concluded that cyclic variability in the EKG, the period of low flame growth-rate and weak chemiluminescence, was the dominant cause of cyclic variability in combustion phasing. Also, findings indicated only a weak correlation between the creation of large kernels and motion of the plasma channel away from the spark gap. At the higher load, robust flame propagation immediately followed the spark discharge. It was inferred that local fuel/air distribution affected the transition to flame propagation. Advisors/Committee Members: Sick, Volker (advisor).

Subjects/Keywords: Advances; Combustion; Engines; Experimental; Gasoline; Hcci; Homogeneous Charge Compression Ignition; How; Investigation; Phasing; Spark Ignition; Spark-assisted Compression Ignition; Spark-ignition

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Natarajan, V. K. (2006). Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/126242

Chicago Manual of Style (16^th Edition):

Natarajan, Vinod Kumar. “Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines.” 2006. Doctoral Dissertation, University of Michigan. Accessed March 05, 2021. http://hdl.handle.net/2027.42/126242.

MLA Handbook (7^th Edition):

Natarajan, Vinod Kumar. “Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines.” 2006. Web. 05 Mar 2021.

Vancouver:

Natarajan VK. Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines. [Internet] [Doctoral dissertation]. University of Michigan; 2006. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2027.42/126242.

Council of Science Editors:

Natarajan VK. Spark -assisted compression ignition: An experimental investigation into how spark ignition advances combustion phasing in gasoline HCCI engines. [Doctoral Dissertation]. University of Michigan; 2006. Available from: http://hdl.handle.net/2027.42/126242

Michigan State University

27. Jaffri, Kasser A. (Kasser Ali). A volumetric quantification of in-cylinder flow motion inside a four-valve SI engine using three dimensional Laser Doppler velocimetry.

Degree: MS, Department of Mechanical Engineering, 1996, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:29781

Subjects/Keywords: Spark ignition engines; Internal combustion engines – Cylinders; Internal combustion engines – Fluid dynamics

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jaffri, K. A. (. A. (1996). A volumetric quantification of in-cylinder flow motion inside a four-valve SI engine using three dimensional Laser Doppler velocimetry. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:29781

Chicago Manual of Style (16^th Edition):

Jaffri, Kasser A (Kasser Ali). “A volumetric quantification of in-cylinder flow motion inside a four-valve SI engine using three dimensional Laser Doppler velocimetry.” 1996. Masters Thesis, Michigan State University. Accessed March 05, 2021. http://etd.lib.msu.edu/islandora/object/etd:29781.

MLA Handbook (7^th Edition):

Jaffri, Kasser A (Kasser Ali). “A volumetric quantification of in-cylinder flow motion inside a four-valve SI engine using three dimensional Laser Doppler velocimetry.” 1996. Web. 05 Mar 2021.

Vancouver:

Jaffri KA(A. A volumetric quantification of in-cylinder flow motion inside a four-valve SI engine using three dimensional Laser Doppler velocimetry. [Internet] [Masters thesis]. Michigan State University; 1996. [cited 2021 Mar 05]. Available from: http://etd.lib.msu.edu/islandora/object/etd:29781.

Council of Science Editors:

Jaffri KA(A. A volumetric quantification of in-cylinder flow motion inside a four-valve SI engine using three dimensional Laser Doppler velocimetry. [Masters Thesis]. Michigan State University; 1996. Available from: http://etd.lib.msu.edu/islandora/object/etd:29781

Universidade do Rio Grande do Sul

28. Andreoli, Alexandre Giordani. Análise e simulação de mapas base de injeção eletrônica de combustível para motores de ignição a centelha.

Degree: 2012, Universidade do Rio Grande do Sul

URL: http://hdl.handle.net/10183/75756

►

Uma nova metodologia para a criação de mapas base de injeção eletrônica de combustível para motores de combustão interna de ignição a centelha é apresentada… (more)

▼

Uma nova metodologia para a criação de mapas base de injeção eletrônica de combustível para motores de combustão interna de ignição a centelha é apresentada e seu comportamento é comparado com os resultados fornecidos pela metodologia MVEM. A partir da utilização de equacionamentos da literatura, é feita uma modelagem do ciclo ideal Otto para um motor genérico alternativo monocilíndrico de 500 cm³ de volume deslocado. É modelada também uma válvula do tipo borboleta genérica de 0,06 m³ de diâmetro que opera tanto em regime subsônico quanto sônico. A pressão à jusante da borboleta é calculada para aberturas de 5° a 88,64°. Os modelos são acoplados a partir da vazão mássica de ar admitida, que é o parâmetro principal, sendo programados e simulados usando o programa comercial EES. O mapa base de pressão por abertura de borboleta por rotação resultante mostra o detalhe de descontinuidade pelo uso das equações de vazão mássica juntamente com a imposta pelas equações de coeficiente de descarga, implicando na mudança brusca de valores de pressão calculados para a região de abertura menor que 20%. O mapa de vazão mássica de combustível por rotação e por abertura de borboleta para uma razão estequiométrica de 14,67 também é gerado. Nele é possível observar a demanda por vazão mássica de combustível para cada rotação e abertura da válvula borboleta mostrando o caminho a ser seguido pelo motor para que seja atingida a vazão mássica necessária para obter-se a relação ar/combustível desejada. A metodologia proposta gera mapas base de combustível para módulos de injeção eletrônica. Os resultados são apresentados na forma de gráficos. O modelo produz resultados satisfatórios, reproduzindo o comportamento da válvula borboleta, comparado com a literatura.

A new methodology for EMS base maps to the internal combustion spark ignition engines is presented. Its behavior is compared with results from the MVEM methodology. From the technical literature an ideal Otto cycle for a generic reciprocating single cylinder engine with 500 cm³ of displaced volume. Also, throttle valve with a diameter of 0.06 m of diameter operating in subsonic and sonic flow regime is modeled. The downstream pressure is calculated for throttle openings of 5° to 88.64°. The models are coupled using the engine air mass flow rate as the main parameter, being programmed and simulated using a commercial EES software. The base map of pressure versus throttle opening and engine speed shows the discontinuity detail imposed from the mass flow and discharge coefficient equations, resulting into a abrupt change of pressure values calculated for an opening region less than 20%. The fuel mass flow versus revolutions per minute versus throttle valve opening for stoichiometric air fuel ratio of 14.67 is also generated. In such map it is possible to show the fuel mass flow demand for each rotation and throttle opening showing the path to be followed by the engine to reach the mass air flow needed to reach the target air fuel ratio. This methodology generates base fuel maps for…

Advisors/Committee Members: Mello, Pedro Barbosa.

Subjects/Keywords: Base fuel maps; Motor de combustão interna; Electronic fuel injection; Combustíveis; Simulação numérica; Internal combustion spark ignition engines; Throttle valve; Simulation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Andreoli, A. G. (2012). Análise e simulação de mapas base de injeção eletrônica de combustível para motores de ignição a centelha. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/75756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Andreoli, Alexandre Giordani. “Análise e simulação de mapas base de injeção eletrônica de combustível para motores de ignição a centelha.” 2012. Thesis, Universidade do Rio Grande do Sul. Accessed March 05, 2021. http://hdl.handle.net/10183/75756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Andreoli, Alexandre Giordani. “Análise e simulação de mapas base de injeção eletrônica de combustível para motores de ignição a centelha.” 2012. Web. 05 Mar 2021.

Vancouver:

Andreoli AG. Análise e simulação de mapas base de injeção eletrônica de combustível para motores de ignição a centelha. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2012. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10183/75756.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Andreoli AG. Análise e simulação de mapas base de injeção eletrônica de combustível para motores de ignição a centelha. [Thesis]. Universidade do Rio Grande do Sul; 2012. Available from: http://hdl.handle.net/10183/75756

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Sul

29. Lanzanova, Thompson Diordinis Metzka. Avaliação numérica e experimental do desempenho de um motor Otto operando com etanol hidratado.

Degree: 2013, Universidade do Rio Grande do Sul

URL: http://hdl.handle.net/10183/75927

►

Uma maneira ecologicamente correta de manejar os recursos energéticos disponíveis e reduzir as emissões de gases de efeito estufa é utilizar biocombustíveis ao invés de… (more)

▼

Uma maneira ecologicamente correta de manejar os recursos energéticos disponíveis e reduzir as emissões de gases de efeito estufa é utilizar biocombustíveis ao invés de combustíveis de origem fóssil em motores de combustão interna. Entretanto, o preço mais alto dos biocombustíveis pode ser um fator limitante para o aumento e viabilização do seu uso. Em relação ao etanol, para se obter misturas com mais de 80% de etanol em água o custo de produção cresce exponencialmente. Assim, se misturas de etanol com alto percentual de água, de menor custo, puderem ser utilizadas em motores de combustão interna com sucesso, esse combustível pode se tornar mais atrativo e mais amplamente utilizado. Este trabalho analisa o desempenho de um motor de ignição por centelha operando com etanol em diferentes percentuais de hidratação, através de simulações computacionais e procedimentos experimentais. Foi utilizado um motor monocilíndrico de 0,668L e naturalmente aspirado, com relação de compressão de 19:1 e injeção direta em pré-câmara, ciclo Diesel, foi modificado para operação em ciclo Otto - injeção de combustível no duto de admissão e relação de compressão de 12:1. Testes em dinamômetro foram conduzidos com o etanol hidratado comercial (95% de etanol e 5% de água) e com misturas de etanol e água com maiores percentuais de hidratação (conteúdo volumétrico de até 60% de etanol e 40% de água). Simulação computacional através de software de volumes finitos unidimensional foi utilizada para realizar a análise da combustão. Foi possível alcançar operação estável com misturas de até 40% de água em etanol e ocorreu aumento de eficiência térmica para misturas de até 30% de água.

An environmentally friendly way to manage the available energetic resources and to reduce greenhouse gas emissions is to use bio instead of fossil fuels in internal combustion engines. However, the sometimes higher prices of biofuels can be a limiting factor for their widespread and viable use. Concerning ethanol and its production costs, to obtain above 80% ethanol-in-water mixtures demands an exponentially increasing energy supply. Hence, if a low-cost high water content ethanol could be successfully burned in internal combustion engines it would be even more attractive and extensively used. This work analyzes the performance of a spark ignition engine running with ethanol with different percentages of hydration through numeric and experimental simulations. To achieve this goal, a 0,668L naturally aspirated single cylinder engine, with compression ratio of 19:1 and pre-chamber direct injection, operating at Diesel cycle was modified to operate in Otto cycle - port fuel injection, with a compression ratio of 12:1. Dynamometer tests were carried out with commercial hydrous ethanol (95% ethanol and 5% water) and water-in-ethanol blends with higher hydration levels (volumetric content up to 60% ethanol and 40% water). Computer simulation through one-dimensional finite volume software was carried out to perform a heat release analysis. It was possible to achieve…

Advisors/Committee Members: Vielmo, Horacio Antonio.

Subjects/Keywords: Internal combustion engines; Motor de combustão interna; Spark ignition; Biocombustíveis; Etanol; Hydrous ethanol; Heat release analysis

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lanzanova, T. D. M. (2013). Avaliação numérica e experimental do desempenho de um motor Otto operando com etanol hidratado. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/75927

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lanzanova, Thompson Diordinis Metzka. “Avaliação numérica e experimental do desempenho de um motor Otto operando com etanol hidratado.” 2013. Thesis, Universidade do Rio Grande do Sul. Accessed March 05, 2021. http://hdl.handle.net/10183/75927.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lanzanova, Thompson Diordinis Metzka. “Avaliação numérica e experimental do desempenho de um motor Otto operando com etanol hidratado.” 2013. Web. 05 Mar 2021.

Vancouver:

Lanzanova TDM. Avaliação numérica e experimental do desempenho de um motor Otto operando com etanol hidratado. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2013. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/10183/75927.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lanzanova TDM. Avaliação numérica e experimental do desempenho de um motor Otto operando com etanol hidratado. [Thesis]. Universidade do Rio Grande do Sul; 2013. Available from: http://hdl.handle.net/10183/75927

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Michigan

30. Buckland, Julia H. Estimation methods for turbocharged spark ignition engines.

Degree: PhD, Automotive engineering, 2009, University of Michigan

URL: http://hdl.handle.net/2027.42/127140

► Downsizing and turbocharging is an effective method for improving fuel economy, while meeting customer expectations for vehicle performance in a spark ignition engine. The turbocharger,… (more)

Subjects/Keywords: Estimation; Methods; Spark Ignition Engines; Turbocharged; Turbochargers

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Buckland, J. H. (2009). Estimation methods for turbocharged spark ignition engines. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/127140

Chicago Manual of Style (16^th Edition):

Buckland, Julia H. “Estimation methods for turbocharged spark ignition engines.” 2009. Doctoral Dissertation, University of Michigan. Accessed March 05, 2021. http://hdl.handle.net/2027.42/127140.

MLA Handbook (7^th Edition):

Buckland, Julia H. “Estimation methods for turbocharged spark ignition engines.” 2009. Web. 05 Mar 2021.

Vancouver:

Buckland JH. Estimation methods for turbocharged spark ignition engines. [Internet] [Doctoral dissertation]. University of Michigan; 2009. [cited 2021 Mar 05]. Available from: http://hdl.handle.net/2027.42/127140.

Council of Science Editors:

Buckland JH. Estimation methods for turbocharged spark ignition engines. [Doctoral Dissertation]. University of Michigan; 2009. Available from: http://hdl.handle.net/2027.42/127140

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations