EFFECTS OF INJECTION STRATEGY ON D.I. DIESEL ENGINE COMBUSTION  

作　　者：ZI Xinyun JIANG Dahai DENG Chenglin OUYANG Minggao YANG Fuyuan 

机构地区：[1]Department of Automotive Engineering, Tianjin Traffic Institute, Tianjin 300161, China [2]Department of Automotive Engineering, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Journal of Mechanical Engineering》2007年第3期71-74,共4页中国机械工程学报（英文版）

基　　金：This project is supported by National Natural Science Foundation of China(No. 50676107);State Key Laboratory of Automotive Safety and Energyof China (No. KF2006-07).

摘　　要：Experiments are conducted to develop an understanding of how split injections can affect the combustion and emission characteristics of a D.I. diesel engine with a common-rail injection system. The ratio of the amount of fuel injected between two injection pulses and the injection interval is varied keeping the injected fuel quantity constant. Results show that under the 70D90-10 injection pattern, the engine achieves the lower NOx-smoke emissions and BSFC compared with the single injection pattern. The heat release rate and the temperature show that the split injections increase the initial premixed burn and retards the diffusion burn. With the balance of these two effects, the maximum in-cylinder temperature decreases while the 50% heat release point is held at almost the same crank angle. Therefore, both NOx emission and BSFC are improved while keeping the smoke emission at the same level.Experiments are conducted to develop an understanding of how split injections can affect the combustion and emission characteristics of a D.I. diesel engine with a common-rail injection system. The ratio of the amount of fuel injected between two injection pulses and the injection interval is varied keeping the injected fuel quantity constant. Results show that under the 70D90-10 injection pattern, the engine achieves the lower NOx-smoke emissions and BSFC compared with the single injection pattern. The heat release rate and the temperature show that the split injections increase the initial premixed burn and retards the diffusion burn. With the balance of these two effects, the maximum in-cylinder temperature decreases while the 50% heat release point is held at almost the same crank angle. Therefore, both NOx emission and BSFC are improved while keeping the smoke emission at the same level.

关 键 词：Diesel engine High pressure common rail Split injections EMISSION 

分 类 号：TK4[动力工程及工程热物理—动力机械及工程]