Simulation Study into Effect of Intake Air Oxygen Concentration on Combustion Process in Diesel Engine

doi:10.3969/j.issn.1000-1093.2014.07.001

Abstract

Abstract: In order to investigate the effect of intake air oxygen concentration on the combustion process in diesel engine, computation fluid dynamics (CFD) software FIRE is used to simulate the combustion process in terms of the ratio of oxygen and nitrogen in intake air. The results show that intake air oxygen concentration affects the quality of fuel-air mixture. With the decrease in intake air oxygen concentration, the rich fuel-air mixture increases, which leads to a decrease in heat release rate in the stage of diffusion combustion. The decrease in intake air oxygen concentration reduces the in-cylinder peak pressure and combustion temperature, and the quality of combustion becomes worse. The oxygen-enriched combustion leads to a remarkable increase in NOx emission and a decrease in soot emission; with a decrease in intake air oxygen concentration at part load, both NOx and soot emissions decrease.

Key words: power machinery engineering, diesel engine, intake air oxygen concentration, combustion process, emission

CLC Number:

TK421

MA Xiao-kang, ZHANG Fu-jun, HAN Kai, ZHANG Zhen-yu. Simulation Study into Effect of Intake Air Oxygen Concentration on Combustion Process in Diesel Engine[J]. Acta Armamentarii, 2014, 35(7): 945-952.

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