Numerical simulation on effects of spray angle in a swirl chamber combustion system of DI (direct injection) diesel engines

Shengli Wei, Kunpeng Ji, Xianyin Leng, Feihu Wang and Xin Liu

Energy, 2014, vol. 75, issue C, 289-294

Abstract: In order to make better air utilization in combustion chamber to improve the mixture quality, enhance combustion efficiency and reduce emissions, a new swirl chamber combustion system of DI (direct injection) diesel engines is proposed. The in-cylinder spray, mixture formation and combustion progresses are simulated and investigated at different nozzle angles with AVL-FIRE code. Results show that in the current combustion system, spray angle of 146° is the best on the aspect of mixture homogeneity among all the cases. NO mass fraction is the lowest at spray angle of 154°, while Soot mass fraction is the lowest at spray angle of 146°. At the initial stage of spray, the fuel/air equivalence ratio distribution was primarily controlled by the squish and swirl, while after ignition in expansion stroke, the combustion swirl and reverse squish had great impact on the in-cylinder temperature distribution. To sum up, the spray angle and air motion matching with the combustion chamber is a key factor on combustion process and emissions performance. Considering the emission performance, spray angle of 150° is a relatively better compromise in the new combustion system.

Keywords: DI (direct injection) diesel engines; Swirl chamber; Combustion system; Spray angle; Numerical simulation (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:75:y:2014:i:c:p:289-294

DOI: 10.1016/j.energy.2014.07.076

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