Simulation of combustion in spark-ignition engine fuelled with natural gas-hydrogen blends combined with EGR
Received date: 10 Nov 2008
Accepted date: 06 Jan 2009
Published date: 05 Jun 2009
Copyright
A numerical simulation of the influence of different hydrogen fractions, excess air ratios and EGR mass fractions in a spark-ignition engine was conducted. Good agreement between the calculated and measured in-cylinder pressure traces as well as pollutant formation trends was obtained. The simulation results show that NO concentration has an exponential relationship with temperature and increases sharply as hydrogen is added. EGR introduction strongly influences the gas temperature and NO concentration in the cylinder. The difference in temperature will lead to even greater difference in NO concentration. Thus, EGR can effectively decrease NO concentration. NO concentration reaches its peak value at the excess air ratio of 1.1 regardless of EGR mass fraction. The study shows that natural gas-hydrogen blend combined with EGR can realize a stable combustion and low NO emission in a spark-ignition engine.
Key words: natural gas; hydrogen; NO; exhaust gas recirculation; numerical simulation
Jie WANG , Zuohua HUANG , Bing LIU , Xibin WANG . Simulation of combustion in spark-ignition engine fuelled with natural gas-hydrogen blends combined with EGR[J]. Frontiers in Energy, 0 , 3(2) : 204 -211 . DOI: 10.1007/s11708-009-0026-9
CNG | compressed natural gas |
EGR | exhaust gas recirculation |
TDC | top dead center |
BDC | bottom dead center |
ATDC | after top dead center |
BTDC | before top dead center |
WOT | wide open throttle |
λ | excess air ratio |
n | engine speed |
φ(H2) | hydrogen mass fraction |
φ | crank angle |
φig | ignition time by crank angle scale |
T | mean cylinder temperature |
p | mean cylinder pressure |
1 |
Huang Zuohua, Wang Jinhua, Huang Yinyu. Research summary of hydrogen utilization on internal combustion engine. China Science and Technology Thesis Online, 2006-08-10, http://www.paper.edu.cn (in Chinese)
|
2 |
Karim G A, Wierzba I, Al-Alousi Y. Methane-hydrogen mixtures as fuels. International Journal of Hydrogen Energy, 1996, 21(7): 625-631
|
3 |
Bauer C G, Forest T W. Effect of hydrogen addition on performance of methane fueled vehicles, Part I: Effect on S.I. engine performance. International Journal of Hydrogen Energy, 2001, 26(1): 55-70
|
4 |
Shodo T, Shimamura K, Nakajima Y. Combustion and emissions in a methane stratified charge engine with hydrogen pre-mixing. JSAE Review, 2000, 21(1): 3-7
|
5 |
Sierens R, Rosseel E. Variable composition hydrogen/natural gas mixtures for increased engine efficiency and decreased emissions. Transactions of the ASME, Journal of Engineering for Gas Turbines and Power, 2000, 122(1): 135-140
|
6 |
Abd-Alla G H. Using exhaust gas recirculation in internal combustion engines: A Review. Energy Convers Manage, 2002, 43(8): 1027-1042
|
7 |
Tao Wenquan. Numerical Heat Transfer. Xi’an: Xi’an Jiaotong University Press, 2001, 432-478
|
8 |
Tao Daxue, Kong Qiyi, Li Zhiming,
|
9 |
Gmbh L. AVL Manual CFD Solver V8.3. 2004, (2): 16
|
10 |
Xia Xinglan, Li Detao, Dong Gang,
|
11 |
Shi Chuntao, Qin De, Tang Qi,
|
12 |
Jiang Deming, Chen Changyou, Yang Jialin,
|
13 |
Gmbh L. AVL Manual CFD Solver v8.3, 2004, (3): 30-41
|
14 |
Li Zhiqiang, Wei Fei, Zhou Lixing. Progress in numerical simulation of turbulent reacting rate of NO Formation in Turbulent Combustion. Journal of Combustion Science and Technology, 2004, 10(5): 273-774 (in Chinese)
|
15 |
Akansu S O, Dulger A, Kahraman N,
|
16 |
Heywood J B. Internal Combustion Engine Fundamentals. New York: McGraw-Hill, 1998
|
17 |
Liu Bing, Huang Zuohua, Zeng Ke,
|
/
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