Study on the design and matching of injection parameters of high pressure common rail diesel engine

被引：0
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作者：
Liu, Jixin [1 ]
Han, Shuangfeng [1 ]
Hu, Fengju [1 ]
Liu, Runqiang [1 ]
机构：
[1] Institute of Intelligence & Manufacture, Qingdao Huanghai University, China
来源：
UPB Scientific Bulletin, Series D: Mechanical Engineering | 2020年 / 83卷 / 02期
关键词：
This article aims to explore the matching performance of the injection parameters of the high-pressure common rail diesel engine. A three-dimensional CFD simulation model of the working process in the diesel engine cylinder is established using AVL_ FIRE software. The influence of structural parameters; including the number of injection holes; the diameter of injection holes; the injection pressure; the angle of injection cone and the extending height of nozzle on the matching of oil-gas-chamber in cylinder are analyzed. By comparing the two initial vortex ratio schemes of 0.4 and 0.85; the spray atomization effect of the 6-hole injector is the best when the initial vortex ratio is 0.4; and the spray atomization effect of the 5-hole injector is the best when the initial vortex ratio is 0.85.The results show that the selection of the number and the diameter of the injection holes has an important influence on the mixture quality of the oil-gas in the cylinder and the spatial distribution of the mixed gas. The increase in the number of injection holes and the decrease in the diameter of the injection holes are beneficial to the fuel vaporization and atomization before combustion. It is a positive correlation between the injection pressure; the angle of injection cone and the air utilization. There is a positive correlation between the injection pressure and the air utilization; and a positive correlation trend is evident from the initial stage. The instantaneous heat release rate of the crankshaft increases with the increase of the crank angle; and the maximum instantaneous heat release rate shows a positive correlation with the injection pressure. The increase of fuel injection pressure is helpful for fuel atomization and the after combustion period. The higher injection pressure is conducive to the enhancement of air utilization ratio. There is a positive correlation between the cone angle and the air utilization rate. However; when the cone angle of fuel injection increases to a certain value; the change of air utilization rate is not obvious and basically stabilizes. There is a significant negative correlation between the protruding height and air utilization. © 2020; Politechnica University of Bucharest. All rights reserved;
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页码：119 / 136
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