摘要
在一台4缸柴油机上研究预喷策略(预喷率和预喷间隔)对燃烧与排放特性的影响。研究结果表明:与单次喷射相比,采用预喷策略后,最大压力升高率和NO x排放降低,soot、THC和CO排放升高,热效率提高;增大预喷率,预喷放热率峰值、soot、THC和CO排放升高,NO x排放降低;增大预喷间隔,热效率和soot排放降低,最大压力升高率、THC和CO排放升高;改变预喷间隔对NO x排放无明显影响;在小负荷工况下,与单次喷射相比,采用大预喷率和小预喷间隔策略能同时实现柴油机较高热效率和较低NO x排放。
The effects of pilot injection strategies on combustion and emission were investigated on a 4-cylinder diesel engine,including pilot injection rate and pilot-main interval.The results show that the maximum pressure rise rate and NO x emissions decrease and the soot,THC and CO emissions increase after utilizing the pilot injection strategies.Increasing the pilot injection rate will lead to the increase of peak pilot injection heat release rate,soot,THC and CO emissions and the reduction of NO x emissions.Increasing the pilot-main interval will lead to the reduction of thermal efficiency and soot emission and the increase of maximum pressure rise rate,THC and CO emissions.Changing the pilot interval has little effect on NO x emissions.Compared with the single injection,the adoption of both large pilot injection rate and small pilot interval can achieve high thermal efficiency and low NO x emissions at the same time at low load.
作者
王辉
黄荣
郭晓宇
黄豪中
WANG Hui;HUANG Rong;GUO Xiaoyu;HUANG Haozhong(Guangxi Yuchai Machinery Co.,Ltd.,Yulin 537005,China;School of Mechanical Engineering,Guangxi University,Nanning 530004,China)
出处
《车用发动机》
北大核心
2020年第3期88-92,共5页
Vehicle Engine
基金
广西科技计划项目(桂科AC16380047,桂科攻1598007-45)。
关键词
柴油机
预喷
燃烧
排放
diesel engine
pilot injection
combustion
emission
