Numerical simulation of impinging convexity on partition combustion system performance of diesel engines
1.School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Institute for Energy Research, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：In order to strengthen the utilization of jet kinetic energy, a partition combustion system with spray impinging convexity was proposed to improve the spatial distribution of spray for diesel engines. The in- cylinder spray, the mixture formation and the combustion process of partition combustion system were simulated by AVL FIRE software to analyze the influence of convexity impingement on the combustion and emission characteristics of the system. The results show that by the partition-structure, the average turbulent kinetic energy in the cylinder is improved， and the airflow into combustion chamber in compression process is strengthened. In the case of convexity impingement with no significant accumulation of oil beam, the increasing cone angle of convexity leads to the reduced peak of average turbulent kinetic energy in the cylinder and slows down the air flow out combustion chamber in expansion process, and the diffusion combustion becomes more obvious with lower soot emission.
2015, Vol. 36 
