Fuel and air mixing characteristics of wall-flow-guided combustion systems under a low excess air ratio condition in direct injection diesel engines

Li XiangRong, Zhao WeiHua, Gao HaoBu and Liu FuShui

Energy, 2019, vol. 175, issue C, 554-566

Abstract: In this study, wall-flow-guided combustion systems (WFGCS) were analyzed with the view to improve air use efficiency, fuel economy and emission performance in direct injection (DI) diesel engines. The results of previous study show that WFGCS facilitate favorable combustion and emission performance at low excess air coefficients. To quantitatively analyze the fuel/air mixing characteristics of WFGCS under a low excess air ratio, a computational fluid dynamics (CFD) simulation method was used to measure the spray concentration distribution in a double-swirl combustion system (DSCS), lateral-swirl combustion system (LSCS) and ω combustion system (OMECS). The results show that with an excess air ratio of 1.5, WFGCS reduce the proportion of the rich mixture with an equivalence ratio between 2 and 4 and increase the combustible mixture with an equivalence ratio between 1 and 2, which is conducive to improving the combustion and emission characteristics of DI diesel engines. Therefore, WFGCS have broad application prospects in refining the fuel/air mixture and improving the air use efficiency in the combustion chamber of DI diesel engines.

Keywords: DI diesel engines; Wall-flow-guided combustion systems; Low excess air ratio; Fuel and air mixing characteristics (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:175:y:2019:i:c:p:554-566

DOI: 10.1016/j.energy.2019.03.120

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