吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (3): 797-805.doi: 10.13229/j.cnki.jdxbgxb201503017

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Simulation study of lean combustion characteristic of direct injection CNG engine

HUANG Ya, LIN Xue-dong, LI De-gang, GU Jing-jing, HOU Yu-jing   

  1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022,China
  • Received:2014-05-26 Online:2015-05-01 Published:2015-05-01

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Abstract: This paper is focused on the effects of different injection and spark modes on the in-cylinder equivalence ratio, temperature field as well as the NO formation. The simulation process is based on the experiment on a direct injection Compressed Natural Gas (CNG) engine, which was observed with optical device. Results show that the in-cylinder equivalence ratio distribution, which can be controlled by the injection mode, is the key factor for lean combustion control. Moreover, the equivalence ratio distribution directly impacts the flame propagation and temperature field. The spark mode mainly influences the in-cylinder temperature filed, so that influences the NO formation. The higher the gradient of equivalence ratio distribution, the faster the flame propagation and the more stable the lean combustion. The double spark mode can effectively control the flame propagation speed.

Key words: power machinery engineering, DI-CNG engine, lean combustion, injection mode, spark mode, flame propagation mechanism, NOx formation

CLC Number: 

  • TK411
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