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1.
Lo, Chen Chia.
Characteristics of smoldering combustion of sawdust.
Degree: MSin Engineering, Mechanical Engineering, 2013, University of Texas – Austin
URL: http://hdl.handle.net/2152/22661 
► This report is a study on the smoldering combustion of natural sawdust from untreated woods. The objective was to develop and test an experimental technique…
(more)
▼ This report is a study on the smoldering combustion of natural sawdust from untreated woods. The objective was to develop and test an experimental technique to study the fundamental behavior of sawdust smolder. The experimental setup was an annulus cookstove packed with sawdust between the inner and outer radii creating a central hollow core. The sawdust was ignited by a heating coil wrapped around the inner radius. Thermocouples were embedded in the sawdust bed fanning out in the radial direction, and temperature was recorded throughout the smolder process. Consistent with the literature, the experimental results indicate that wood smolder consists of three pathways, 1) sawdust to char, 2) sawdust to volatiles, and 3) char to ash. Pathways 1 and 3 can be clearly characterized by the temperature profile of the smolder; however, pathway 2 often involves flaming of the sawdust and is beyond the scope of this study. Pathway 1, sawdust to char, is an endothermic reaction that results in a clearly defined char front that propagates across the sawdust bed in the radial direction. As smolder proceeds, the char continues to oxidize and breaks down into non-volatile products such as water vapor and carbon dioxide (CO₂) in further exothermic reactions. Pathway 2, char to ash, is an exothermic reaction that can lead to glowing combustion when exposed to sufficient amounts of oxygen and results in spikes in temperature. In contrast to the clearly defined char front, the ashing zone traces cracks in the sawdust where air can penetrate through, and has no discernible front. Section 1 discusses the motivation behind the study of sawdust cookstoves in third world countries, in particular Ghana, to replace wood with sawdust as a cheap alternative for household fuel. Section 2 details the experimental setup of the cookstove rig and the methodology of the experiments conducted. Section 3 reports the results of the experiments and analyzes the temperature profiles in relation to the three types of chemical reactions as noted above. Section 4 concludes with a summary of the results and discusses efforts in measuring emissions from the smolder and future work to be done.
Advisors/Committee Members: Ellzey, Janet L. (advisor).
Subjects/Keywords: Sawdust; Smolder; Smoldering combustion; Biomass; Ghana; Cookstove; Char oxidation; Ash
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APA (6th Edition):
Lo, C. C. (2013). Characteristics of smoldering combustion of sawdust. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/22661
Chicago Manual of Style (16th Edition):
Lo, Chen Chia. “Characteristics of smoldering combustion of sawdust.” 2013. Masters Thesis, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/22661.
MLA Handbook (7th Edition):
Lo, Chen Chia. “Characteristics of smoldering combustion of sawdust.” 2013. Web. 05 Mar 2021.
Vancouver:
Lo CC. Characteristics of smoldering combustion of sawdust. [Internet] [Masters thesis]. University of Texas – Austin; 2013. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/22661.
Council of Science Editors:
Lo CC. Characteristics of smoldering combustion of sawdust. [Masters Thesis]. University of Texas – Austin; 2013. Available from: http://hdl.handle.net/2152/22661
2.
Schoegl, Ingmar Michael.
Superadiabatic combustion in counter-flow heat exchangers.
Degree: PhD, Mechanical Engineering, 2009, University of Texas – Austin
URL: http://hdl.handle.net/2152/10622
► Syngas, a combustible gaseous mixture of hydrogen, carbon monoxide, and other species, is a promising fuel for efficient energy conversion technologies. Syngas is produced by…
(more)
▼ Syngas, a combustible gaseous mixture of hydrogen, carbon monoxide, and other species, is a promising fuel for efficient energy conversion technologies. Syngas is produced by breaking down a primary fuel into a hydrogen-rich mixture in a process called fuel reforming. The motivation for the utilization of syngas rather than the primary fuel is that syngas can be used in energy conversion technologies that offer higher conversion efficiencies, e.g. gas turbines and fuel cells. One approach for syngas production is partial oxidation, which is an oxygen starved combustion process that does not require a catalyst. Efficient conversion to syngas occurs at high levels of oxygen depletion, resulting in mixtures that are not flammable in conventional combustion applications. In non-catalytic partial oxidation, internal heat recirculation is used to increase the local reaction temperatures by transferring heat from the product stream to pre-heat the fuel/air mixture before reactions occur, thus increasing reaction rates and allowing for combustion outside the conventional flammability limits. As peak temperatures lie above the adiabatic equilibrium temperature predicted by thermodynamic calculations, the combustion regime used for non-catalytic fuel reforming is referred to as 'superadiabatic'. Counter-flow heat exchange is an effective way to transfer heat between adjacent channels and is used for a novel, heat-recirculating fuel reformer design. An analytical study predicts that combustion zone locations inside adjacent flow channels adjust to operating conditions, thus stabilizing the process for independent variations of flow velocities and mixture compositions. In experiments, a reactor prototype with four channels with alternating flow directions is developed and investigated. Tests with methane/air and propane/air mixtures validate the operating principle, and measurements of the resulting syngas compositions verify the feasibility of the concept for practical fuel-reformer applications. Results from a two-dimensional numerical study with detailed reaction chemistry are consistent with experimental observations. Details of the reaction zone reveal that reactions are initiated in the vicinity of the channel walls, resulting in "tulip"-shaped reaction layers. Overall, results confirm the viability of the non-catalytic reactor design for fuel reforming applications.
Advisors/Committee Members: Ellzey, Janet L. (advisor).
Subjects/Keywords: Syngas; Energy conversion technologies; Oxidation; Superadiabatic combustion; Counter-flow heat exchangers; Fuel reforming
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APA (6th Edition):
Schoegl, I. M. (2009). Superadiabatic combustion in counter-flow heat exchangers. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/10622
Chicago Manual of Style (16th Edition):
Schoegl, Ingmar Michael. “Superadiabatic combustion in counter-flow heat exchangers.” 2009. Doctoral Dissertation, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/10622.
MLA Handbook (7th Edition):
Schoegl, Ingmar Michael. “Superadiabatic combustion in counter-flow heat exchangers.” 2009. Web. 05 Mar 2021.
Vancouver:
Schoegl IM. Superadiabatic combustion in counter-flow heat exchangers. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2009. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/10622.
Council of Science Editors:
Schoegl IM. Superadiabatic combustion in counter-flow heat exchangers. [Doctoral Dissertation]. University of Texas – Austin; 2009. Available from: http://hdl.handle.net/2152/10622
3.
-6475-8115.
Characteristics of radially propagating smoldering combustion in a sawdust bed.
Degree: MSin Engineering, Mechanical engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/34069
► In this thesis, experimental work on smoldering of sawdust beds is presented and discussed. Extensive study has been done on wood burning cook stoves with…
(more)
▼ In this thesis, experimental work on smoldering of sawdust beds is presented and discussed. Extensive study has been done on wood burning cook stoves with an emphasis on performance characterization and optimization. Few studies, however, have focused on the smoldering process with the goal of understanding the propagation of the front and the production of emissions. In this study, photographs, temperature and emission measurements on smoldering sawdust clearly showed the evolution of the combustion process: an initial conversion of the raw sawdust to char followed by the conversion of char to ash. In general, the char front propagated symmetrically in the radial direction while the ash front was not symmetric, and typically followed paths where oxygen was most readily available. Further analysis was accomplished by observing the characteristics of the sawdust bed before transition to flaming occurred. Contrary to expected results, flaming did not occur as the air flow was increased, but rather once it was decreased, suggesting that flaming is determined by a balance between generation of volatiles and dilution by incoming air. Experiments with vitiated air, in which the oxygen content of air is diluted by adding nitrogen, were conducted to determine a limit at which combustion was no longer self-sustaining. Experiments showed that vitiated air with 7% oxygen in the supply air did not support self-sustaining combustion.
Finally, a comparison between poplar and walnut was conducted to show the effect of wood species. Comparison of temperature, hydrocarbon, and carbon monoxide outputs identified characteristic differences between the poplar and walnut species.
Advisors/Committee Members: Ellzey, Janet L. (advisor).
Subjects/Keywords: Sawdust; Combustion; Smoldering; Cookstove; Pyrolysis; Flaming; Hydrocarbon; Emission; Carbon monoxide; HC; CO; Radial
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APA (6th Edition):
-6475-8115. (2015). Characteristics of radially propagating smoldering combustion in a sawdust bed. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/34069
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-6475-8115. “Characteristics of radially propagating smoldering combustion in a sawdust bed.” 2015. Masters Thesis, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/34069.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-6475-8115. “Characteristics of radially propagating smoldering combustion in a sawdust bed.” 2015. Web. 05 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-6475-8115. Characteristics of radially propagating smoldering combustion in a sawdust bed. [Internet] [Masters thesis]. University of Texas – Austin; 2015. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/34069.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-6475-8115. Characteristics of radially propagating smoldering combustion in a sawdust bed. [Masters Thesis]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/34069
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
4.
-5734-0418.
Fire safety in sustainable buildings : status, options, alternatives.
Degree: PhD, Mechanical Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/47453
► Sustainable design is a holistic goal of efficiency and optimization to reduce building energy consumption and environmental impact while improving occupant health and safety. Sustainable…
(more)
▼ Sustainable design is a holistic goal of efficiency and optimization to reduce building energy consumption and environmental impact while improving occupant health and safety. Sustainable building construction is one of the fastest growing industries in the United States. Changes in materials, products, designs, and methodologies are occurring to accommodate this green progression. While these changes have energy and environmental benefits, questions have been raised about the impacts on fire safety. As sustainability is rapidly adopted in the building construction industry, so too must our understanding of fire safety implications. It is possible that a single fire event can negate several, if not all, elements of green design. Intermingling green design and fire safety such that they reinforce rather than undermine each other would produce a net benefit to both humans and the environment. Without this consideration, green design could unintentionally increase fire risk and damage. To begin addressing some of these concerns, a three-pronged approach was taken in this research. First, a detailed qualitative examination of the relationship between fire safety and sustainability in buildings was conducted, including a discussion on the status of the fire and sustainability communities and recommendations on areas for development and implementation to promote fire safe sustainable designs. This first analysis concludes that exchange between the sustainability and fire safety communities is inadequate. The fire safety community is focused on quantifying and tracking such implications with a concern for firefighter security and training, while the sustainability community is focused on meeting the minimum building code requirements for fire protection. Second, a quantitative analysis on thermal insulation, an essential building material, was performed to demonstrate the current options available to designers and regulators and, more generally, how to integrate both fire safety and sustainability in material selection. A pointed result of this work is that rockwool, an insulation popular in Europe but rarely used in the United States, consistently ranked as a top performer. In the third component of this work, an investigation into the viability of two alternative, reportedly environmentally benign flame retardants (FRs) was conducted for use on flexible polyurethane foam (PU), a prevalent material in interior furnishings. Several previously unknown characteristics of these unique FRs were discovered through this work, including dissimilarities to a conventional halogenated FR treatment. In summary, this research elucidates the current status of the nexus of fire safety and sustainability, offers an immediate method of selecting preferable material options, and validates sustainable FR alternatives.
Advisors/Committee Members: Ezekoye, Ofodike A. (advisor), Webber, Michael E., 1971- (advisor), Ellison, Christopher J. (committee member), Ellzey, Janet L. (committee member).
Subjects/Keywords: Fire safety; Sustainability; Insulation; Green building; Optimization; Flame retardant; Polydopamine; Flexible polyurethane foam; Thermal degradation; Kinetic parameters
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APA (6th Edition):
-5734-0418. (2017). Fire safety in sustainable buildings : status, options, alternatives. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/47453
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-5734-0418. “Fire safety in sustainable buildings : status, options, alternatives.” 2017. Doctoral Dissertation, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/47453.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-5734-0418. “Fire safety in sustainable buildings : status, options, alternatives.” 2017. Web. 05 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-5734-0418. Fire safety in sustainable buildings : status, options, alternatives. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2017. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/47453.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-5734-0418. Fire safety in sustainable buildings : status, options, alternatives. [Doctoral Dissertation]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/47453
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
5.
-1322-3556.
Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.
Degree: PhD, Mechanical Engineering, 2018, University of Texas – Austin
URL: http://hdl.handle.net/2152/68397
► A research team developed the University of Texas Fuel Economy Model to estimate the fuel consumption of both light-duty and heavy-duty vehicles operated on Texas…
(more)
▼ A research team developed the
University of
Texas Fuel Economy Model to estimate the fuel consumption of both light-duty and heavy-duty vehicles operated on
Texas roads. One of the objectives of the model was to be as flexible as possible in order to be capable of simulating a variety of vehicles, payloads, and traffic conditions. For heavy-duty vehicles, there are no prescribed driving cycles, there are no coastdown coefficients available from the EPA, and we relied on experimental brake specific fuel consumption maps for a few heavy-duty diesel engines.
Heavy-duty vehicle drive cycles highly depend upon the vehicle load, the grade of the road, the engine size, and the traffic conditions. In order to capture real driving conditions 54 drive cycles with three different Class 8 trucks, three weight configurations, three traffic congestion levels, and two drivers are collected. Drive cycles obtained in this research include road grade and vehicle speed data with time.
Due to the lack of data from EPA for calculating the road load force for heavy-duty vehicles, coastdown tests were performed.
To generate generic fuel maps for the fuel economy model, a direct injection quasi-dimensional diesel engine model was developed based on in-cylinder images available in the literature. Sandia National Laboratory researchers obtained various images describing diesel spray evolution, spray mixing, premixed combustion, mixing controlled combustion, soot formation, and NOx formation via imaging technologies. Dec combined all of the available images to develop a conceptual diesel combustion model to describe diesel combustion from the start of injection up to the quasi-steady form of the jet. The end of injection behavior was left undescribed in this conceptual model because no clear image was available due to the chaotic behavior of diesel combustion. A conceptual end-of-injection diesel combustion behavior model was proposed to capture diesel combustion in its life span.
A full-cycle quasi-dimensional direct injection diesel engine model was developed that represents the physical models, utilizing the conceptual model developed from imaging experiments and available experiment-based spray models, of the in-cylinder processes. The compression, expansion, and gas exchange stages are modeled via zero-dimensional single zone calculations. A full cycle simulation is necessary in order to capture the initial conditions of the closed section of the cycle and predict the brake specific fuel consumption accurately.
Advisors/Committee Members: Matthews, Ronald D. (advisor), Hall, Matthew John (advisor), Ellzey, Janet L. (committee member), Ezekoye, Ofodike A. (committee member), Biros, George (committee member), Roberts, Charles E. (committee member).
Subjects/Keywords: Quasi-dimensional; Diesel; Engine; Heavy-duty; Direct injection; Numerical; Modeling; Combustion; Coastdown; Drive cycle; Fuel economy; Mathematical; Vehicle; Simulation; Class 8
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APA (6th Edition):
-1322-3556. (2018). Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/68397
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-1322-3556. “Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/68397.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-1322-3556. “Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling.” 2018. Web. 05 Mar 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/68397.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-1322-3556. Fuel economy predictions for heavy‐duty vehicles and quasi‐dimensional DI diesel engine numerical modeling. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/68397
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
6.
Campbell, Michael Cennen.
Lessons learned from the University of Texas at Austin's Project with Underserved Communities (PUC) program.
Degree: MSin Engineering, Civil Engineering, 2017, University of Texas – Austin
URL: http://hdl.handle.net/2152/62855
► This paper’s objective is to identify and document lessons learned and understand what factors make a PUC project successful in terms of benefit to project…
(more)
▼ This paper’s objective is to identify and document lessons learned and understand what factors make a PUC project successful in terms of benefit to project participants and the community served as well as what characteristics lead to project challenges. A lessons learned database was constructed to document the lessons learned from 11 different final PUC project repots. This database was then analyzed to examine trends among the lessons learned. Recommendations are made regarding the possible applications of the lessons learned database to the PUC program and other potential benefactors.
Advisors/Committee Members: O'Connor, James Thomas (advisor), Ellzey, Janet L. (committee member).
Subjects/Keywords: Lessons learned database; Service learning
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APA (6th Edition):
Campbell, M. C. (2017). Lessons learned from the University of Texas at Austin's Project with Underserved Communities (PUC) program. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/62855
Chicago Manual of Style (16th Edition):
Campbell, Michael Cennen. “Lessons learned from the University of Texas at Austin's Project with Underserved Communities (PUC) program.” 2017. Masters Thesis, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/62855.
MLA Handbook (7th Edition):
Campbell, Michael Cennen. “Lessons learned from the University of Texas at Austin's Project with Underserved Communities (PUC) program.” 2017. Web. 05 Mar 2021.
Vancouver:
Campbell MC. Lessons learned from the University of Texas at Austin's Project with Underserved Communities (PUC) program. [Internet] [Masters thesis]. University of Texas – Austin; 2017. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/62855.
Council of Science Editors:
Campbell MC. Lessons learned from the University of Texas at Austin's Project with Underserved Communities (PUC) program. [Masters Thesis]. University of Texas – Austin; 2017. Available from: http://hdl.handle.net/2152/62855
7.
Smith, Colin Healey.
Studies of rich and ultra-rich combustion for syngas production.
Degree: PhD, Mechanical Engineering, 2012, University of Texas – Austin
URL: http://hdl.handle.net/2152/19578
► Syngas is a mixture of hydrogen (H2), carbon monoxide (CO) and other species including nitrogen (N2), water (H2O), methane (CH4) and higher hydrocarbons. Syngas is…
(more)
▼ Syngas is a mixture of hydrogen (H2), carbon monoxide (CO) and other species including nitrogen (N2), water (H2O), methane (CH4) and higher hydrocarbons. Syngas is a highly desired product because it is very versatile. It can be used for combustion in turbines or engines, converted to H2 for use in fuel cells, turned into diesel or other high-molecular weight fuels by the Fischer-Tropsch process and used as a chemical feedstock. Syngas can be derived from hydrocarbons in the presence of oxidizer or water as in steam reforming. There are many demonstrated methods to produce syngas with or without water addition including catalytic methods, plasma reforming and combustion.
The goal of this study is to add to the understanding of non-catalytic conversion of hydrocarbon fuels to syngas, and this was accomplished through two investigations: the first on fuel conversion potential and the second on the effect of preheat temperature.
A primarily experimental investigation of the conversion of jet fuel and butanol to syngas was undertaken to understand the potential of these fuels for conversion. With these new data and previously-published experimental data, a comparison amongst a larger set of fuels for conversion was also conducted. Significant soot formation was observed in experiments with both fuels, but soot formation was so significant in the jet fuel experiments that it limited the range of experimental operating conditions. The comparison amongst fuels indicated that higher conversion rates are observed with smaller molecular weight fuels, generally. However, equilibrium calculations, which are often used to determine trends in fuel conversion, showed the opposite trend.
In order to investigate preheat temperature, which is one important aspect of non-catalytic conversion, experiments were undertaken with burner-stabilized flames that are effectively 1-D and steady-state. An extensive set of model calculations were compared to the obtained experimental data and was used to investigate the effect of preheat temperatures that were beyond what was achievable experimentally. Throughout the range of operating conditions that were tested experimentally, the computational model was excellent in its predictions. Experiments where the reactants were preheated showed a significant expansion of the stable operating range of the burner (increasing the equivalence ratio at which the flame blew off). However, increasing preheat temperature beyond what is required for stabilization did not improve syngas yields.
Advisors/Committee Members: Ellzey, Janet L. (advisor), Ezekoye, Ofodike A (committee member), Hidrovo, Carlos H (committee member), Berberoglu, Halil (committee member), Raja, Laxminarayan L (committee member).
Subjects/Keywords: Combustion; Syngas; Jet fuel; Butanol; Laminar flames; Preheated flames
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APA (6th Edition):
Smith, C. H. (2012). Studies of rich and ultra-rich combustion for syngas production. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/19578
Chicago Manual of Style (16th Edition):
Smith, Colin Healey. “Studies of rich and ultra-rich combustion for syngas production.” 2012. Doctoral Dissertation, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/19578.
MLA Handbook (7th Edition):
Smith, Colin Healey. “Studies of rich and ultra-rich combustion for syngas production.” 2012. Web. 05 Mar 2021.
Vancouver:
Smith CH. Studies of rich and ultra-rich combustion for syngas production. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2012. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/19578.
Council of Science Editors:
Smith CH. Studies of rich and ultra-rich combustion for syngas production. [Doctoral Dissertation]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/19578
8.
Byun, Jung Joo.
Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures.
Degree: PhD, Mechanical Engineering, 2011, University of Texas – Austin
URL: http://hdl.handle.net/2152/ETD-UT-2011-05-516
► Iso-octane, n-heptane, ethanol and their blends were tested in a constant volume combustion chamber to measure laminar burning velocities. The experimental apparatus was modified from…
(more)
▼ Iso-octane, n-heptane, ethanol and their blends were tested in a constant volume combustion chamber to measure laminar burning velocities. The experimental apparatus was modified from the previous version to an automatically-controlled system. Accuracy and speed of data acquisition were improved by this modification. The laminar burning velocity analysis code was also improved for minimized error and fast calculation. A large database of laminar burning velocities at elevated temperatures and pressures was established using this improved experimental apparatus and analysis code.
From this large database of laminar burning velocities, laminar flame speeds were extracted. Laminar flame speeds of iso-octane, n-heptane and blends were investigated and analysed to derive new correlations to predict laminar flame speeds of any blending ratio. Ethanol and ethanol blends with iso-octane and/or n-heptane were also examined to see the role of ethanol in the blends.
Generally, the results for iso-octane and n-heptane agree with published data. Additionally, blends of iso-octane and n-heptane exhibited flame speeds that followed linear blending relationships. A new flame speed model was successfully applied to these fuels. Ethanol and ethanol blends with iso-octane and/or n-heptane exhibited a strongly non-linear blending relationship and the new flame speed model was not applied to these fuels. It was shown that the addition of ethanol into iso-octane and/or n-heptane accelerated the flame speeds.
Advisors/Committee Members: Hall, M. J. (Matthew John) (advisor), Matthews, Ronald D. (advisor), Ellzey, Janet L. (committee member), Ezekoye, Ofodike A. (committee member), Roberts, Charles E. (committee member).
Subjects/Keywords: Laminar flame speed; Laminar burning velocity; Fuel blends; Iso-octane; n-heptane; Ethanol
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APA (6th Edition):
Byun, J. J. (2011). Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-05-516
Chicago Manual of Style (16th Edition):
Byun, Jung Joo. “Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures.” 2011. Doctoral Dissertation, University of Texas – Austin. Accessed March 05, 2021.
http://hdl.handle.net/2152/ETD-UT-2011-05-516.
MLA Handbook (7th Edition):
Byun, Jung Joo. “Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures.” 2011. Web. 05 Mar 2021.
Vancouver:
Byun JJ. Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2011. [cited 2021 Mar 05].
Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-516.
Council of Science Editors:
Byun JJ. Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures. [Doctoral Dissertation]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-05-516
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Open Access Theses and Dissertations
