subject:(Stratified Charge Combustion)

The Ohio State University

1. Janes, Nigel. SIMPLIFIED MODELING OF STRATIFIED-CHARGE COMBUSTION IN A CONSTANT VOLUME CHAMBER.

Degree: PhD, Mechanical Engineering, 2002, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1010419896

► The value of combustion models cannot be overstated. As a major component of engine models they are widely used as research tools in the continuing… (more)

Subjects/Keywords: Engineering, Mechanical; stratified-charge; stratified-charge model; stratified-charge combustion; stratified combustion model; stratified combustion; combustion modeling; simplified combustion modeling

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APA (6^th Edition):

Janes, N. (2002). SIMPLIFIED MODELING OF STRATIFIED-CHARGE COMBUSTION IN A CONSTANT VOLUME CHAMBER. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1010419896

Chicago Manual of Style (16^th Edition):

Janes, Nigel. “SIMPLIFIED MODELING OF STRATIFIED-CHARGE COMBUSTION IN A CONSTANT VOLUME CHAMBER.” 2002. Doctoral Dissertation, The Ohio State University. Accessed April 14, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1010419896.

MLA Handbook (7^th Edition):

Janes, Nigel. “SIMPLIFIED MODELING OF STRATIFIED-CHARGE COMBUSTION IN A CONSTANT VOLUME CHAMBER.” 2002. Web. 14 Apr 2021.

Vancouver:

Janes N. SIMPLIFIED MODELING OF STRATIFIED-CHARGE COMBUSTION IN A CONSTANT VOLUME CHAMBER. [Internet] [Doctoral dissertation]. The Ohio State University; 2002. [cited 2021 Apr 14]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1010419896.

Council of Science Editors:

Janes N. SIMPLIFIED MODELING OF STRATIFIED-CHARGE COMBUSTION IN A CONSTANT VOLUME CHAMBER. [Doctoral Dissertation]. The Ohio State University; 2002. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1010419896

Penn State University

2. Kazmouz, Samuel. Large-Eddy Simulations of Motored Flow and Combustion in a Stratified-Charge Direct-Injection Spark-Ignition Engine.

Degree: 2020, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/17568xuk13

► Stratified-charge, spray-guided, spark-ignition, direct-injection operation offers efficiency improvements to conventional engines used in light-duty vehicles. However, cycle-to-cycle variability (CCV) impedes extracting the full efficiency potential… (more)

▼ Stratified-charge, spray-guided, spark-ignition, direct-injection operation offers efficiency improvements to conventional engines used in light-duty vehicles. However, cycle-to-cycle variability (CCV) impedes extracting the full efficiency potential of such advanced engine operation modes. In this dissertation, multi-cycle motored and fired large-eddy simulation (LES) results of an optically-accessible single-cylinder four-valve direct-injection spark- ignition engine, called G4VDI, are presented and compared to experimental results. The main objective is to investigate the root causes of CCV in stratified-charge engines. For motored operation, four sets of 60 consecutive LES cycles, with different operating conditions, are compared with experiments. LES is able to capture the wave dynamics of the ports and the in-cylinder pressure with a difference of 0.12%-2.5%, compared to experimental results. The LES velocity fields are compared with particle-image velocimetry measurements at six cutting planes. Based on the local and volume-averaged structure and magnitude indexes, it is found that LES is able to reproduce key flow events and capture large-scale in-cylinder flow structures, especially in high tumble/swirl conditions. Using proper orthogonal decomposition, LES shows that high tumble/swirl conditions produce low CCV flow fields. CCV of in-cylinder pressure ranged between 0.13% and 0.23%. For fired operation, and using the thickened flame model (TFM), 20 consecutive LES cycles of a homogeneous-charge engine operation mode are presented followed by spray-characterization in four different ambient conditions. These results lay the foundation for two stratified-charge engine operation modes, in which 20 and 35 consecutive LES cycles are compared with experiments, respectively. TFM-LES is extended for partially premixed flames and is able to reproduce experimental in-cylinder pressure (0.5%-10%), cyclic variability (20.5%-22.7%) in global and local quantities, local fuel vapor distributions, and heat release curves for homogeneous and stratified burn. Tuning TFM to reduce the burn rate increases the tendency to produce misfires, as well as the levels of CCV. Correlation analysis done on the stratified-charge LES results suggests that the influence of the early burn on the subsequent flame development is more subtle for stratified combustion compared to homogeneous combustion, that is the local conditions at the spark plug when the flame starts propagating are more influential than the conditions at spark timing, and that the injection event creates velocity conditions which might be favorable or unfavorable for the combustion event. The main contributions of this dissertation are extending TFM to highly stratified spray combustion, showing that LES can reproduce experimentally measured flow and combustion behavior in a realistic engine, including CCV, and analyzing LES to provide new insight into CCV and misfires of stratified-charge engines. Advisors/Committee Members: Daniel Connell Haworth, Dissertation Advisor/Co-Advisor, Daniel Connell Haworth, Committee Chair/Co-Chair, Jacqueline Antonia O'Connor, Committee Member, Yuan Xuan, Committee Member, Sven Schmitz, Outside Member, Stephen R Turns, Special Member, Robert John Santoro, Special Member, Karen Ann Thole, Program Head/Chair.

Subjects/Keywords: Internal Combustion Engines; Large-Eddy Simulation; Cycle-to-Cycle Variations; Stratified-Charge Combustion; Gasoline-Direct-Injection Engine

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APA (6^th Edition):

Kazmouz, S. (2020). Large-Eddy Simulations of Motored Flow and Combustion in a Stratified-Charge Direct-Injection Spark-Ignition Engine. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/17568xuk13

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):

Kazmouz, Samuel. “Large-Eddy Simulations of Motored Flow and Combustion in a Stratified-Charge Direct-Injection Spark-Ignition Engine.” 2020. Thesis, Penn State University. Accessed April 14, 2021. https://submit-etda.libraries.psu.edu/catalog/17568xuk13.

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

MLA Handbook (7^th Edition):

Kazmouz, Samuel. “Large-Eddy Simulations of Motored Flow and Combustion in a Stratified-Charge Direct-Injection Spark-Ignition Engine.” 2020. Web. 14 Apr 2021.

Vancouver:

Kazmouz S. Large-Eddy Simulations of Motored Flow and Combustion in a Stratified-Charge Direct-Injection Spark-Ignition Engine. [Internet] [Thesis]. Penn State University; 2020. [cited 2021 Apr 14]. Available from: https://submit-etda.libraries.psu.edu/catalog/17568xuk13.

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

Council of Science Editors:

Kazmouz S. Large-Eddy Simulations of Motored Flow and Combustion in a Stratified-Charge Direct-Injection Spark-Ignition Engine. [Thesis]. Penn State University; 2020. Available from: https://submit-etda.libraries.psu.edu/catalog/17568xuk13

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

Université de Sherbrooke

3. Oh, David. Reduced convective combustion chamber wall heat transfer losses of hydrogen-fueled engines by a vortex-stratified combustion process: Réduction des pertes de chaleur par convection aux parois de la chambre de combustion des moteurs à hydrogène grâce à la combustion stratifiée par vortex.

Degree: 2019, Université de Sherbrooke

URL: http://hdl.handle.net/11143/14946

► Abstract: A vortex-stratified combustion process for hydrogen-fueled reciprocating internal combustion engines is introduced to increase the thermal efficiency by reducing the convective heat transfer losses… (more)

▼ Abstract: A vortex-stratified combustion process for hydrogen-fueled reciprocating internal combustion engines is introduced to increase the thermal efficiency by reducing the convective heat transfer losses to the surrounding walls during combustion. This dissertation explains the theoretical background of this novel approach. It investigates the process experimentally in a fired, optically accessible, 2-stroke, hydrogen-fueled, direct-injected engine, presenting the schlieren observations, the results of zero-dimensional cylinder pressure indication and apparent heat release measurements comparing two combustion chamber designs – one that actualizes a homogeneous mixture without specific charge motion directionality representing current spark ignited engine practice and another with the here-introduced vortex-stratified approach. Then, a comparative, transient 2-D CFD analysis finds an approximately 50% reduction in the peak convective flux with the vortex-stratified process compared to the reference non-vortex design. The experimental observations and simulation results show that the reduced heat flux of the vortex-stratified approach is driven by the combination of two effects: (1) The first is finite-time diffusive mixing getting outpaced by the replenishment of pure air being introduced preferentially along the circumference of the combustion chamber due to the Coandă effect. This results in a distinct radial charge stratification during mixture preparation in the compression stroke with a fuel-concentrated center and essentially pure air at the periphery; (2) The second effect is the forced-segregation of different density reactants during the course of the combustion process caused by large body forces that result from the gravitational acceleration of the rapidly rotating charge, which inhibit combustion at the periphery and causes the propagating flame to curl away from the walls toward the center. Advisors/Committee Members: Plante, Jean-Sébastien (advisor).

Subjects/Keywords: Moteur à combustion interne; Hydrogène; Pertes de transfert de chaleur aux parois; Écoulement vortex; Charge stratifiée; Strioscopie; Internal combustion engine; Hydrogen; Wall heat transfer losses; Vortex flow; Stratified charge; Schlieren

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

APA (6^th Edition):

Oh, D. (2019). Reduced convective combustion chamber wall heat transfer losses of hydrogen-fueled engines by a vortex-stratified combustion process: Réduction des pertes de chaleur par convection aux parois de la chambre de combustion des moteurs à hydrogène grâce à la combustion stratifiée par vortex. (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://hdl.handle.net/11143/14946

Chicago Manual of Style (16^th Edition):

Oh, David. “Reduced convective combustion chamber wall heat transfer losses of hydrogen-fueled engines by a vortex-stratified combustion process: Réduction des pertes de chaleur par convection aux parois de la chambre de combustion des moteurs à hydrogène grâce à la combustion stratifiée par vortex.” 2019. Doctoral Dissertation, Université de Sherbrooke. Accessed April 14, 2021. http://hdl.handle.net/11143/14946.

MLA Handbook (7^th Edition):

Oh, David. “Reduced convective combustion chamber wall heat transfer losses of hydrogen-fueled engines by a vortex-stratified combustion process: Réduction des pertes de chaleur par convection aux parois de la chambre de combustion des moteurs à hydrogène grâce à la combustion stratifiée par vortex.” 2019. Web. 14 Apr 2021.

Vancouver:

Oh D. Reduced convective combustion chamber wall heat transfer losses of hydrogen-fueled engines by a vortex-stratified combustion process: Réduction des pertes de chaleur par convection aux parois de la chambre de combustion des moteurs à hydrogène grâce à la combustion stratifiée par vortex. [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2019. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/11143/14946.

Council of Science Editors:

Oh D. Reduced convective combustion chamber wall heat transfer losses of hydrogen-fueled engines by a vortex-stratified combustion process: Réduction des pertes de chaleur par convection aux parois de la chambre de combustion des moteurs à hydrogène grâce à la combustion stratifiée par vortex. [Doctoral Dissertation]. Université de Sherbrooke; 2019. Available from: http://hdl.handle.net/11143/14946

4. Lillo, Peter. Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine.

Degree: PhD, Mechanical Engineering, 2016, University of Michigan

URL: http://hdl.handle.net/2027.42/135897

► No technology can currently replace fossil fuel powered internal combustion engines as the primary source of transportation power. For better or worse, the next generation… (more)

▼ No technology can currently replace fossil fuel powered internal combustion engines as the primary source of transportation power. For better or worse, the next generation of automobiles will continue to be powered by combustion. As such, it is in our best interest to learn how to burn fuel in the smartest manner. There are many advanced combustion strategies that promise efficiency improvements over conventional strategies, most of which have failed to make it onto the road due to technical deficiencies. Many of these strategies, such as spray-guided stratified-charge combustion, rely upon the precise partial mixing of fuel with oxidizer inside the combustion chamber. Advanced computational tools are being developed to aid such challenging designs. However, a lack of understanding of in-cylinder flame physics and computational power limitations continues to hinder the predictive abilities of engine models. In this work, engine flame topological development is studied. Flame wrinkled-ness is both one of the most important and poorly understood engine combustion phenomena. Generally, a flame may wrinkle for two reasons: (i) its own naturally instabilities and/or (ii) through interaction with turbulent flow. The relative contribution of these two causes towards flame wrinkled-ness in the engine environment was unclear so targeted experiments were performed to provide some clarity. The development of flame wrinkled-ness within an optically accessible engine was measured with a combination of planar laser induced fluorescence and stereo particle image velocimetry under homogeneous-charge and stratified-charge conditions. From this, equivalence ratio, charge velocities, and flame wrinkled-ness were quantified and analyzed. For the iso-octane/toluene mixtures studied the flame wrinkling was insensitive to thermo-diffusive flame front instabilities. The relative contribution of wrinkles of various spatial scales towards overall flame wrinkled-ness was also measured. Homogeneous-charge flames generally had lower wrinkling factors than stratified-charge flames. Overall, flame wrinkled-ness increased with flame size under both modes of engine operation. Large flames demonstrated an ability to maintain more large scale wrinkles than small flames, which contributed to their overall higher levels of wrinkled-ness. Based on the observations, suggestions are provided for those who are developing advanced homogeneous and stratified-charge engine models. Advisors/Committee Members: Sick, Volker (committee member), Driscoll, James F (committee member), Boehman, Andre L (committee member), Martz, Jason Brian (committee member), Reuss, David L (committee member).

Subjects/Keywords: Internal Combustion Engine; Engine Flame Topology; Homogeneous Charge Combustion; Stratified Charge Combustion; Optical Diagnostics; Flame Wrinkling; Mechanical Engineering; Engineering

…219 Figure 6-1: Stratified-charge engine combustion images from 3 mm offset imaging plane… …226 Figure 6-2: Stratified-charge engine combustion images from 3 mm offset imaging plane… …227 Figure 6-3: Stratified-charge engine combustion images from 3 mm offset imaging plane… …228 Figure 6-4: Stratified-charge engine combustion images from 3 mm offset imaging plane… …229 xviii Figure 6-5: Stratified-charge engine combustion images from 3 mm offset imaging…

11 more images…

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

APA (6^th Edition):

Lillo, P. (2016). Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/135897

Chicago Manual of Style (16^th Edition):

Lillo, Peter. “Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine.” 2016. Doctoral Dissertation, University of Michigan. Accessed April 14, 2021. http://hdl.handle.net/2027.42/135897.

MLA Handbook (7^th Edition):

Lillo, Peter. “Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine.” 2016. Web. 14 Apr 2021.

Vancouver:

Lillo P. Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine. [Internet] [Doctoral dissertation]. University of Michigan; 2016. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/2027.42/135897.

Council of Science Editors:

Lillo P. Topological Development of Homogeneous-Charge and Stratified-Charge Flames in an Internal Combustion Engine. [Doctoral Dissertation]. University of Michigan; 2016. Available from: http://hdl.handle.net/2027.42/135897

5. ΘΕΟΔΩΡΑΚΑΚΟΣ, ΑΝΔΡΕΑΣ. ΑΡΙΘΜΗΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΩΝ ΦΑΣΕΩΝ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ ΣΕ ΠΑΛΙΝΔΡΟΜΙΚΕΣ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ.

Degree: 1998, Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA)

URL: http://hdl.handle.net/10442/hedi/9028

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ΣΤΗΝ ΠΑΡΟΥΣΑ ΕΡΓΑΣΙΑ ΕΠΙΔΙΩΚΕΤΑΙ Η ΠΡΟΣΟΜΟΙΩΣΗ ΤΗΣ ΡΟΗΣ ΣΕ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ (ΜΕΚ) ΒΑΣΙΖΟΜΕΝΟΙ ΣΕ ΜΕΘΟΔΟΛΟΓΙΕΣ ΠΟΥ ΕΧΟΥΝ ΑΝΑΠΤΥΧΘΕΙ ΣΤΑ ΠΛΑΙΣΙΑ ΤΗΣ ΥΠΟΛΟΓΙΣΤΙΚΗΣ ΡΕΥΣΤΟΜΗΧΑΝΙΚΗΣ. ΓΙΝΕΤΑΙ… (more)

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ΣΤΗΝ ΠΑΡΟΥΣΑ ΕΡΓΑΣΙΑ ΕΠΙΔΙΩΚΕΤΑΙ Η ΠΡΟΣΟΜΟΙΩΣΗ ΤΗΣ ΡΟΗΣ ΣΕ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ (ΜΕΚ) ΒΑΣΙΖΟΜΕΝΟΙ ΣΕ ΜΕΘΟΔΟΛΟΓΙΕΣ ΠΟΥ ΕΧΟΥΝ ΑΝΑΠΤΥΧΘΕΙ ΣΤΑ ΠΛΑΙΣΙΑ ΤΗΣ ΥΠΟΛΟΓΙΣΤΙΚΗΣ ΡΕΥΣΤΟΜΗΧΑΝΙΚΗΣ. ΓΙΝΕΤΑΙ Ο ΠΛΗΡΗΣ ΜΕΤΑΣΧΗΜΑΤΙΣΜΟΣ ΤΩΝ ΕΞΙΣΩΣΕΩΝ NAVIER - STOKES ΣΕ ΓΕΝΙΚΕΥΜΕΝΟ ΚΑΜΠΥΛΟΓΡΑΜΜΟ ΣΥΣΤΗΜΑ. ΑΚΟΛΟΥΘΩΣ ΠΑΡΟΥΣΙΑΖΟΝΤΑΙ ΤΑ ΑΠΟΤΕΛΕΣΜΑΤΑ ΑΠΟ ΤΗΝ ΠΡΟΣΟΜΟΙΩΣΗ ΤΗΣ ΜΟΝΙΜΗΣ ΡΟΗΣ ΣΕ ΓΕΩΜΕΤΡΙΑ ΚΥΛΙΝΔΡΟΚΕΦΑΛΗΣ DIESEL ΚΙΝΗΤΗΡΑ ΜΕ ΕΛΙΚΟΕΙΔΗ ΑΥΛΟ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΕΠΙΠΕΔΗ ΚΥΛΙΝΔΡΟΚΕΦΑΛΗ ΟΠΩΣ ΕΠΙΣΗΣ ΚΑΙ Η ΜΗ ΜΟΝΙΜΗ ΡΟΗ ΜΕΣΑ ΣΕ ΚΥΛΙΝΔΡΟ ΜΗΧΑΝΗΣ DIESEL ΜΕ ΜΙΑ ΒΑΛΒΙΔΑΕΙΣΑΓΩΓΗΣ, ΕΠΙΠΕΔΗ ΚΥΛΙΝΔΡΟΚΕΦΑΛΗ ΚΑΙ ΘΑΛΑΜΟ ΚΑΥΣΗΣ ΔΙΑΜΟΡΦΩΜΕΝΟ ΣΤΟ ΕΜΒΟΛΟ.ΣΤΗΝ ΣΥΝΕΧΕΙΑ ΠΑΡΟΥΣΙΑΖΟΝΤΑΙ ΤΑ ΑΠΟΤΕΛΕΣΜΑΤΑ ΤΗΣ ΜΟΝΙΜΗΣ ΚΑΙ ΜΗ ΜΟΝΙΜΗΣ ΡΟΗΣ(ΦΑΣΕΙΣ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ) ΣΕ ΚΙΝΗΤΗΡΑ ΒΕΝΖΙΝΗΣ ΣΥΓΧΡΟΝΗΣ ΣΧΕΔΙΑΣΗΣ ΜΕ ΚΥΛΙΝΔΡΟΚΕΦΑΛΗ ΤΕΣΣΑΡΩΝ ΒΑΛΒΙΔΩΝ. ΓΙΑ ΑΥΤΗ ΤΗΝ ΠΕΡΙΠΤΩΣΗ ΠΡΟΣΟΜΟΙΩΝΕΤΑΙ ΚΑΙ Η ΕΓΧΥΣΗ ΚΑΥΣΙΜΟΥ ΣΤΟΝ ΑΥΛΟ ΕΙΣΑΓΩΓΗΣ, ΟΠΩΣ ΕΠΙΣΗΣ ΚΑΙ ΤΟ ΠΕΔΙΟ ΣΥΓΚΕΝΤΡΩΣΕΩΝ ΤΟΥ ΑΕΡΟΠΟΙΗΜΕΝΟΥ ΚΑΥΣΙΜΟΥ ΜΕΣΑ ΣΤΟΝ ΚΥΛΙΝΔΡΟ. ΑΠΟ ΤΙΣ 2 ΠΡΩΤΕΣ ΓΕΩΜΕΤΡΙΕΣ ΠΟΥΕΛΕΓΧΘΗΚΑΝ ΠΡΟΚΥΠΤΟΥΝ ΧΡΗΣΙΜΑ ΣΥΜΠΕΡΑΣΜΑΤΑ ΓΙΑ ΤΟ ΠΕΔΙΟ ΡΟΗΣ, ΕΝΩ ΕΠΙΣΗΣ ΓΙΝΕΤΑΙ ΚΑΙ ΣΥΓΚΡΙΣΗ ΤΩΝ ΠΡΟΛΕΞΕΩΝ ΜΕ ΠΕΙΡΑΜΑΤΙΚΕΣ ΜΕΤΡΗΣΕΙΣ. ΑΠΟ ΤΗΝ ΠΡΟΣΟΜΟΙΩΣΗ ΤΩΝ ΦΑΣΕΩΝ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ ΣΕ ΣΥΓΧΡΟΝΟ ΚΙΝΗΤΗΡΑ ΒΕΝΖΙΝΗΣ ΠΡΟΚΥΠΤΟΥΝΧΡΗΣΙΜΑ ΣΥΜΠΕΡΑΣΜΑΤΑ ΤΟΣΟ ΓΙΑ ΤΟ ΠΕΔΙΟ ΡΟΗΣ ΜΕΣΑ ΣΤΟΝ ΚΥΛΙΝΔΡΟ ΟΣΟ ΚΑΙ ΓΙΑ ΤΗΝ ΕΓΧΥΣΗ ΚΑΥΣΙΜΟΥ ΣΤΟΝ ΑΥΛΟ ΕΙΣΑΓΩΓΗΣ. ΤΕΛΟΣ ΓΙΝΕΤΑΙ ΜΙΑ (ΠΕΡΙΚΟΠΗ ΠΕΡΙΛΗΨΗΣ)

IN THE PRESENT WORK THE SIMULATION OF THE FLOW INSIDE A RECIPROCATING INTERNAL COMBUSTION ENGINES (ICE) BASED ON THE METHODOLOGIES OF COMPUTATIONAL FLUID MECHANICS IS ATTEMPTED. THE NAVIER - STOKES EQUATIONS ARE PRESENTED AND THE FULL TRANSFORMATION OF THE GOVERNING EQUATIONS IN A GENERALIZED CULVILINEAR COORDINATE SYSTEM IS ANALYZED. THE FLOW FIELD UNDER STEADY CONDITIONS INSIDE A DIESEL ENGINE CYLINDER HEAD EQUIPPED WITH A SWIRL GENERATING HELICOIDAL INLET PORT, AS WELL AS THE TIME DEPENDENT FLOW FIELD INSIDE THE CYLINDER OF A DIESEL ENGINE, WITH ONE INLET VALVE, FLAT CYLINDER HEAD AND A CUP SHAPE COMBUSTION CHAMBER SHAPED INSIDE THE PISTON BOWL ARE NUMERICALLY SIMULATED. THE NEXT CASE EXAMINED CONCERNS THE NUMERICAL SIMULATION OF THE STEADY AND TIME DEPENDANT (COVERING THE INDUCTION AND COMPRESSION STROKES) FLOW FIELD INSIDE THE CYLINDEROF A MODERN DESING, HIGH SPEED GASOLINE ENGINE EQUIPPED WITH 4 VALVES CYLINDER HEAD. FOR THIS CASE THE FUEL SPRAY PORT INJECTION AND THE ATOMIZED FUEL CONCENTRATION FIELD IS ALSO SIMULATED INSIDE THE CYLINDER. FROM THE FIRST 2 CASES INVESTIGATED USEFUL RESULTS ARE DRAWN WHILE A COMPARISON OF THE PREDICTIONS AGAINST EXPERIMENTAL MEASUREMENTS TAKES PLACE. FROM THE SIMULATION OF THE INDUCTION AND COMPRESSION STROKES IN A MODERN DESIGN GASOLINE ENGINE USEFUL RESULTS CONCERNING BOTH THE FLOW FIELD INSIDE THE CYLINDER AND THE FUEL PORT INJECTION (ABSTRACT TRUNCATED)

Subjects/Keywords: Compression strokes; Computational fluid dynamics; FLUID FLOW; FUEL INJECTION; Induction; Internal combustion engines; Numerical simulation; STRATIFIED CHARGE; Αριθμητική προσομιίωση; ΜΗΧΑΝΗ ΕΞΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ; ΡΟΗ ΑΕΡΙΟΥ; ΣΤΡΩΜΑΤΙΚΗ ΓΟΜΩΣΗ; Υπολογιστική ρευστομηχανική; Ψεκασμός καυσίμων

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APA (6^th Edition):

ΘΕΟΔΩΡΑΚΑΚΟΣ, �. (1998). ΑΡΙΘΜΗΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΩΝ ΦΑΣΕΩΝ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ ΣΕ ΠΑΛΙΝΔΡΟΜΙΚΕΣ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ. (Thesis). Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA). Retrieved from http://hdl.handle.net/10442/hedi/9028

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):

ΘΕΟΔΩΡΑΚΑΚΟΣ, ΑΝΔΡΕΑΣ. “ΑΡΙΘΜΗΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΩΝ ΦΑΣΕΩΝ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ ΣΕ ΠΑΛΙΝΔΡΟΜΙΚΕΣ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ.” 1998. Thesis, Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA). Accessed April 14, 2021. http://hdl.handle.net/10442/hedi/9028.

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

MLA Handbook (7^th Edition):

ΘΕΟΔΩΡΑΚΑΚΟΣ, ΑΝΔΡΕΑΣ. “ΑΡΙΘΜΗΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΩΝ ΦΑΣΕΩΝ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ ΣΕ ΠΑΛΙΝΔΡΟΜΙΚΕΣ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ.” 1998. Web. 14 Apr 2021.

Vancouver:

ΘΕΟΔΩΡΑΚΑΚΟΣ �. ΑΡΙΘΜΗΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΩΝ ΦΑΣΕΩΝ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ ΣΕ ΠΑΛΙΝΔΡΟΜΙΚΕΣ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ. [Internet] [Thesis]. Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA); 1998. [cited 2021 Apr 14]. Available from: http://hdl.handle.net/10442/hedi/9028.

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

Council of Science Editors:

ΘΕΟΔΩΡΑΚΑΚΟΣ �. ΑΡΙΘΜΗΤΙΚΗ ΔΙΕΡΕΥΝΗΣΗ ΤΩΝ ΦΑΣΕΩΝ ΕΙΣΑΓΩΓΗΣ ΚΑΙ ΣΥΜΠΙΕΣΗΣ ΣΕ ΠΑΛΙΝΔΡΟΜΙΚΕΣ ΜΗΧΑΝΕΣ ΕΣΩΤΕΡΙΚΗΣ ΚΑΥΣΗΣ. [Thesis]. Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); National Technical University of Athens (NTUA); 1998. Available from: http://hdl.handle.net/10442/hedi/9028

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

6. Votaw, Zachary Steven. Computational Study on Micro-Pilot Flame Ignition Strategy for a Direct Injection Stratified Charge Rotary Engine.

Degree: MSEgr, Mechanical Engineering, 2012, Wright State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1347895074

► The Office of Security of Defense's Assured Fuels Initiative has recently been pressing for a single fuel battle space. This endeavor requires modifying many of… (more)

▼ The Office of Security of Defense's Assured Fuels Initiative has recently been pressing for a single fuel battle space. This endeavor requires modifying many of the vehicle power plants currently in operation throughout the Armed Forces. The RQ-7 Shadow, an unmanned aerial vehicle (UAV) utilized by the Marine Corp and Army for reconnaissance purposes, is powered by UEL's AR741 rotary engine and functions on aviation fuel. One effort underway has been focused on developing this rotary engine system to operate on heavy fuels using direct injection technology and charge stratification. Although the rotary engine has many advantages over standard reciprocating engines, providing a reliable ignition source for the stratified charge within the sweeping combustion chamber presents challenges. This work made effort to compensate for those challenges by utilizing a pilot flame ignition system. The system incorporated a micro-diesel injector and spark plug recessed within an ignition cavity along the housing of the rotary engine. The pilot flame ignition approach was thoroughly evaluated by conducting a parametric study using computational methods to simulate the combustion process. Gambit meshing software was used to build the 3D rotary engine mesh. ANSYS Fluent was used to formulate and apply the various numerical models describing the combustion phenomena. And lastly, JMP software was used to perform a response surface analysis in effort to determine the optimal parameter values for the ignition system. The goal of the parametric study was to maximize power output and likewise minimize specific fuel consumption. A total of thirty one cases were performed to complete the study. For the rotary engine operating at 6000rpm an optimal solution was successfully realized within the design space. The rotary engine model generated 5.313 horsepower (HP) for the complete cycle of one chamber. The overall equivalency ratio allocated in the combustion chamber for the simulations was 0.55. This resulted in a specific fuel consumption of 0.395 lb/hp-h. The study not only provided evidence to confirm the profitable use of a pilot flame ignition system applied to the direct injection stratified charge rotary engine (DISCRE), but also provided multiple insights on the design and operation of such a system. Advisors/Committee Members: Dong, Haibo (Advisor).

Subjects/Keywords: Mechanical Engineering; CFD; Rotary Engine; Wankel Engine; Stratified Charge; Direct Injection; Pilot Flame Ignition; Multi-fuel; Parameter Optimization; Combustion Simulation; Computational Fluid Dynamics

…combustion, spray, and flow properties in a 700cc stratified-charge rotary engine. The rotary… …Direct-injection spark-ignition Liquid density DISC Direct-injection stratified-charge Gas… …density PFI C10H22 ̇ Port fuel injection P DISCRE Direct-injection stratified-charge N… …charge d Orifice diameter SC Stratified-charge P1 Injection pressure TDC Top dead… …of direct-injection stratified-charge 5 (DISC) technology. Conveniently, this…

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

APA (6^th Edition):

Votaw, Z. S. (2012). Computational Study on Micro-Pilot Flame Ignition Strategy for a Direct Injection Stratified Charge Rotary Engine. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1347895074

Chicago Manual of Style (16^th Edition):

Votaw, Zachary Steven. “Computational Study on Micro-Pilot Flame Ignition Strategy for a Direct Injection Stratified Charge Rotary Engine.” 2012. Masters Thesis, Wright State University. Accessed April 14, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347895074.

MLA Handbook (7^th Edition):

Votaw, Zachary Steven. “Computational Study on Micro-Pilot Flame Ignition Strategy for a Direct Injection Stratified Charge Rotary Engine.” 2012. Web. 14 Apr 2021.

Vancouver:

Votaw ZS. Computational Study on Micro-Pilot Flame Ignition Strategy for a Direct Injection Stratified Charge Rotary Engine. [Internet] [Masters thesis]. Wright State University; 2012. [cited 2021 Apr 14]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1347895074.

Council of Science Editors:

Votaw ZS. Computational Study on Micro-Pilot Flame Ignition Strategy for a Direct Injection Stratified Charge Rotary Engine. [Masters Thesis]. Wright State University; 2012. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1347895074

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