Effects of Pilot Injection on Combustion Noise and Polutants Emisision in DI Diesel Engine with CRS
Common Rail System (CRS) is considered as one of the most potential fuel injection equipments for the future internal combustion engine industry. By CRS, the injection rate shape varying and multi-staged injection (like pilot injection) can be controlled flexibly. In order to study the effect of multi-injection (or split injection) modes on combustion noise and exhaust emission, experiments were carried out on a diesel engine with CRS. In addition, a soot model was presented in this work considering both chemical kinetics reaction and turbulent mixing motion of spray jet, namely H-ARR soot model. Through coupling the revised soot model into CFD code, the combustion process and pollutants emission formation were simulated on the test engine. In-cylinder pressure and heat release rate showed satisfactory agreement with measurements. The experimental data and simulated results demonstrate that, pilot injection is one of the most effective measures to reduce combustion noise. Furthermore, it was found a best split injection mode with appropriate pilot injection fuel quantity and optimum pilot-main injection interval could decrease NOx emission while not deteriorating PM emission too much. Meanwhile two concepts of active thermo- atmosphere (ATA) and passive inert-atmosphere (PIA) were put forward to analyze the effect of pilot injection mode on main injection combustion.
Shi Xiuyong Qiao Xinqi Li Guoxiang Huang Zhen
Shanghai Jiaotong University Shandong University
国际会议
天津
英文
1-10
2009-08-19（万方平台首次上网日期，不代表论文的发表时间）