Structural optimization simulation of multi-point distributed guide-table combustion chamber
In this study,a new direct-injection diesel engine with a multi-point distributed guide-table combustion chamber was proposed to improve the fuel spray impingement and mixture formation inside the combustion chamber of a diesel engine.This new combustion chamber structure was parameterized,and a multi-parameter collaborative optimization was performed on seven design variables.Based on a medium-speed marine diesel engine with 230 mm cylinder diameter,the cylinder working process was simulated,obtaining 600 sample points from the design space using latin hypercube sampling.The impact of each design parameter on engine performance was analyzed according to the simulation results,and three new kinds of combustion chamber structures were obtained based on different optimization objectives.The simulation results showed that under 75%load conditions,compared with the original ω-type combustion chamber,the ISFC of the Type I combustion chamber was reduced by 1.83%,and soot emission was reduced by 86.83%;ISFC of the Type II combustion chamber was reduced by 0.97%,NOx emission was reduced by 7.44%,and soot emission was reduced by 68.26%;the NOx emission and soot emission of the Type III combustion chamber were reduced by 10.52%and 58.08%,respectively,while ISFC remained unchanged basically.
万方数据
维普
