Geometric features of the flame propagation process for an SI engine having dual-ignition system

Bilgin, Atilla

doi:10.1002/er.832

Cited by 26 publications

(13 citation statements)

References 14 publications

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“…Laminar burning velocity is important, because not only it is related to feedback of the flame and combustion, but also it plays an important role in stability of the flame in the combustion, and it is considered to be a criterion for providing the details of the reaction mechanism. Fast burning causes decrease in combustion duration, increase in thermal efficiency and decrease in fuel consumption [5].…”

Section: Introductionmentioning

confidence: 99%

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Zahedi

Yousefi

2014

J Mech Sci Technol

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To cite this version:Peyman Zahedi, Kianoosh Yousefi. Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures. AbstractIn this research we have studied the effects of increasing pressure and adding carbon dioxide, hydrogen and nitrogen to Methane-air mixture on premixed laminar burning velocity and NO formation in experimentally and numerically methods. Equivalence ratio was considered within 0.7 to 1.3 for initial pressure between 0.1 to 0.5 MPa and initial temperature was separately considered 298 K. Mole fractions of carbon dioxide, hydrogen and nitrogen were regarded in mixture from 0 to 0.2. Heat flux method was used for measurement of burning velocities of Methane-air mixtures diluted with CO2 and N2. Experimental results were compared to the calculations using a detailed chemical kinetic scheme (GRI-MECH 3.0). At first, the results in atmosphere pressure for Methane-air mixture were calculated and it was compared with the results of literature. Results were in good agreement with published data in the literature. Afterwards, by adding carbon dioxide and nitrogen to Methane-air mixture, we witnessed that laminar burning velocity was decreased, whereas by increasing hydrogen, the laminar burning velocity was increased. Finally, the results showed that by increasing the pressure, the premixed laminar burning velocity decreased for all mixtures and NO formation indicates considerable increase, whereas the laminar flame thickness decreases.

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Section: Introductionmentioning

confidence: 99%

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Zahedi

Yousefi

2014

J Mech Sci Technol

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“…BA motorlar için geliştirilen sanki-boyutlu termodinamik çevrim modelindeki çeşitli çevrim parametrelerini hesaplanmasında alev cephesinin geometrik özellikleri kilit rol oynamaktadır [31][32][33]. Alev cephesinin geometrik özellikleri kütlesel yanma oranının ve yanma odasından olan ısı kaybının hesaplanmasında kullanılmaktadır.…”

Section: Geometrik Model (Geometrical Model)unclassified

Farkli Buji̇ Sayilari Ve Konumularina Sahi̇p Buji̇ Ateşlemeli̇ Bi̇r Motorda Ateşleme Avansinin Motor Performans Parametreleri̇ Üzeri̇ndeki̇ Etki̇si̇

Altın¹,

Bilgin

2016

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETBu çalışmanın amacı, çift bujili buji ateşlemeli (BA) bir motorda ateşleme avansının motor performans parametreleri üzerindeki etkisini incelemektir. Çalışmada sanki-boyutlu termodinamik çevrim modeli kullanılmıştır. Simülasyondaki alev yayılması süreci katı model programı kullanılarak modellenmiştir. Ateşleme avansı başta olmak üzere, ekivalans oranı () ve bujilerin silindir kafasındaki üç farklı konumu çalışmanın inceleme parametrelerini oluşturmaktadır. Elde edilen sonuçlardan, merkezde tek bujiye sahip geometrinin genellikle en iyi motor performans karakteristiklerine sahip olduğu, simetrik çift buji kullanılmasının yanmayı hızlandırması sonucu merkezde tek bujili geometrinin karakteristiklerine yakın değerler verdiği belirlenmiştir. Kenarda tek buji olarak adlandırılan geometri ise buji konumundan dolayı alev yolunun uzaması sonucu en kötü motor performans karakteristikleri vermiştir.Anahtar Kelimler: Çift bujili buji ateşlemeli motor, sanki-boyutlu termodinamik çevrim modeli, motor performansı, ateşleme avansı THE EFFECT OF SPARK ADVANCE ON ENGINE PERFORMANCE CHARACTERISTICS IN A SPARK IGNITION ENGINE HAVING VARIOUS SPARK PLUG NUMBERS AND LOCATIONS ABSTRACTThe aim of this study is to investigate the effect of spark advance on engine performance parameters in a twin spark SI engine. Quasi-dimensional thermodynamic engine cycle model has been used in the study. Flame propagation process in the simulation has been modeled by solid model software. Equivalence ratio (), three various locations of the spark plug(s) on cylinder head, and mainly spark advance has been operating parameters of the study. It has been determined that the geometry having centrally located spark plug(s) gives the best combustion and performance characteristics from the results of the study. Using of twin spark plugs gives closer combustion and performance characteristics due to increasing combustion speed. The mid-radius located single spark geometry gives the worst characteristics since it has the longest flame travelling length.

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“…The geometric features of the flame front in figure 1 have been determined for any flame radius from the following mathematical relations (Blizard & Keck 1974;Keck 1982;Bilgin 2002):…”

Section: (C ) Geometric Sub-modelmentioning

confidence: 99%

“…Under this assumption, the enflamed volume V f , flame surface area A f and heat transfer surface area A w have been computed, depending on the instantaneous enflamed volume V f and chamber height h, by using an iterative method. The values of V f and h have been determined from the thermodynamic cycle model as follows: The geometric features of the flame front in figure 1 have been determined for any flame radius from the following mathematical relations (Blizard & Keck 1974;Keck 1982;Bilgin 2002):…”

Section: (C ) Geometric Sub-modelmentioning

confidence: 99%

Mathematical analysis of spark ignition engine operation via the combination of the first and second laws of thermodynamics

Sezer

Bilgin

2008

Proc. R. Soc. A.

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This study aims at the theoretical exergetic evaluation of spark ignition engine operation. For this purpose, a two-zone quasi-dimensional cycle model was installed, not considering the complex calculation of fluid motions. The cycle simulation consists of compression, combustion and expansion processes. The combustion phase is simulated as a turbulent flame propagation process. Intake and exhaust processes are also computed by a simple approximation method. The results of the model were compared with experimental data to demonstrate the validation of the model. Principles of the second law are applied to the model to perform the exergy (or availability) analysis. In the exergy analysis, the effects of various operational parameters, i.e. fuel-air equivalence ratio, engine speed and spark timing on exergetic terms have been investigated. The results of exergy analysis show that variations of operational parameters examined have considerably affected the exergy transfers, irreversibilities and efficiencies. For instance, an increase in equivalence ratio causes an increase in irreversibilities, while it decreases the first and also the second law efficiencies. The irreversibilities have minimum values for the specified engine speed and optimum spark timing, while the first and second law efficiencies reach a maximum at the same engine speed and optimum spark timing.

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Geometric features of the flame propagation process for an SI engine having dual-ignition system

Cited by 26 publications

References 14 publications

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Farkli Buji̇ Sayilari Ve Konumularina Sahi̇p Buji̇ Ateşlemeli̇ Bi̇r Motorda Ateşleme Avansinin Motor Performans Parametreleri̇ Üzeri̇ndeki̇ Etki̇si̇

Mathematical analysis of spark ignition engine operation via the combination of the first and second laws of thermodynamics

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