基于响应面法的高强化柴油机燃烧系统多参数多目标优化匹配研究  

Multi-Parameter and Multi-Object Optimization on Combustion System of High Power Diesel Engine Based on Response Surface Method

作　　者：袁野[1] 李国岫[1] 虞育松[1] 赵鹏[1] 李洪萌[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《内燃机工程》2012年第5期24-30,共7页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(51076008);中央高校基本科研业务费专项资金资助项目(M11JB00300)

摘　　要：通过引入一种新的优化方法———响应面法,对高强化柴油机燃烧系统进行多参数多目标优化匹配研究。基于有限数量的CFD三维仿真结果,构建了以燃烧室喉口半径、涡流比和喷孔数为输入参数及功率和最高燃烧压力为输出结果的响应面函数,并通过其进行各参数对性能影响的显著性检验和降维分析。基于所得响应面函数进行多参数全局寻优,得到3种具有不同特点的优化方案并与原方案进行缸内微观过程的对比分析。研究结果表明:对于所研究的机型,在喷油压力及喷孔流通面积恒定的情况下,燃烧室喉口半径与喷孔数的匹配和燃烧室喉口半径与涡流比的匹配分别是对功率和最高燃烧压力的主要影响因素;随着喷孔数的增加,功率对涡流比和燃烧室喉口半径的敏感程度逐渐减小,最高燃烧压力对燃烧室喉口半径的敏感程度逐渐增加;在所得的3种优化方案中,10孔和8孔方案可分别单独显著改善功率和最高燃烧压力指标,9孔方案可同时小幅度改善功率和最高燃烧压力指标。Introduced a new optimization method--response surface method, multi-parameter and multi-object optimization on a diesel engine combustion system was conducted. On the basis of certain CFD 3-D simulation results, accurate response surface function with combustion chamber caliber, swirl ratio and nozzle hole number as input ,and with power and burst pressure as output was constructed, significance test and dimensionality reduction analysis of each parameter influence on the performance were conducted using it. By multi-parameter global optimization based on the response surface function, three different optimization schemes were acquired and compared to original scheme about the in-cylinder microcosmic processes. Results show that, for the engine studied, in the case of constant injection pressure and nozzle flow area, matches of combustion chamber caliber with nozzle hole number and swirl ratio were separately the major factors influencing power and burst pressure. With nozzle hole number increasing, sensitivity of the power to swirl ratio and combustion chamber caliber decreases, and sensitivity of the burst pressure to combustion chamber caliber increases. Among the three optimization schemes, 10-hole and 8-hole schemes can significantly improve power or burst pressure improve the both synchronously. indicators respectively, and 9-hole scheme can slightly

关 键 词：内燃机 柴油机 燃烧系统 优化匹配 响应面法 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]