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International Journal of Automotive Technology > Volume 2(3); 2001 > Article
International Journal of Automotive Technology 2001;2(3): 93-101.
ANALYSIS OF IN-CYLINDER FUEL-AIR MIXTURE DISTRIBUTION IN A HEAVY DUTY CNG ENGINE
K.Y. HUH1, SEOK Y. LEE1, Y. M. KIM2, J. H. LEE2
1Pohang University of Science and Technology
2Korea Institute of Machinery and Materials
ABSTRACT
Distribution of fuel-air mixture has a strong influence on performance and emissions of a compressed natural gas (CNG) engine. In this paper, parametric study is performed by KIVA-3V to investigate fuel-air mixture with respect to injection timing, cycle equivalence ratio and engine speed. With open-valve injection intensive mixing during intake and compression stroke results in stratification in the cylinder among the test cases at closed-valve injection. There is close similarity in the calculated distributions of the mixture in the cylinder with different cycle equivalence ratios and engine speeds. The results are compared against pressure traces and flame images obtained in a single cylinder engine converted from a 11L six-cylinder heavy duty diesel engine.
Key Words: CNG engine, Injection timing, Engine speed, Equivalence ratio
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