Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:中南大学学报 自然科学版

Volume:50

Issue:7

Page Number:1729-1735

ISSN No.:1672-7207

Abstract:In order to solve the problem of phasing control for premixed charge compression ignition in diesel engines, the combustion mode of high temperature gas jet controlled compression ignition(JCCI) was employed. It triggers the spontaneous combustion of the pre-mixture in the critical conditions in the cylinder by jetting a certain amount of high temperature gas. The 3D CFD model coupled with the reduced chemical kinetics was developed to investigate the ignition and combustion processes of the high temperature gas JCCI combustion mode, and the effects of jet temperature at 700, 800, 900 and 1 000 K on combustion and emission characteristics were analyzed. The results show that the auto-ignition of the pre-mixture in the cylinder can be triggered by jetting a certain amount of high temperature gas near the top dead center. With the increase of jet temperature, the high temperature reaction starts earlier, and the peak of heat release rate increases. CA50 is advanced, and the burning duration is shortened. Besides, the NOx emission increases, and the CO emission decreases, while the soot emission is almost zero. ? 2019, Central South University Press. All right reserved.

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