Research on method to promote performance of multiple injections diesel engine
Xiaorong Wang1, Chenpeng Liu, Bo Liu2, Wenxian Tang1, Jian Zhang1
1Institute of mechanical engineering,JiangSu University of Science and Technology,Zhenjiang 212003,China
2Hudong Heavy Machinery Co.,Ltd,Shanghai 200129,China
Based on certain type of two-stroke, low-speed diesel engine for marine propulsion, we, in our research project, developed a 3-D model of in-cylinder combustion processes in a diesel engine. Thus, we were able to compare simulated in-cylinder pressure against the experimental pressure under single injection with a maximum error tolerance of 0.36%, the results of which imply that the two are basically consistent. Subsequently, based on the same injection timing, a comparison was made between the performance of a diesel engine using single injection and one using dual injection. The results indicate that the additional injection can lower NOxby58.9% and soot by 30.1%. Moreover, the piston's workload is reduced by 10.1%. Through calibrating injection quality centre, adjusting injection timing of secondary injection reasonably, we gained the method improving performance of combustion and secondary injection diesel engine. By verifying, the method can promote working ability of secondary injection diesel engine effectively. After adjusting injection timing, working ability of secondary injection is as well as it of single injection, but emissions reduce sharply, thereinto, NOx reduced 12.7%, soot reduced 41.1%.