基于数值模拟的排气歧管优化策略  

Optimization Strategy of Exhaust Manifold Based on Numerical Simulation

作　　者：陈征[1] 张波[2] 尧命发[1] 张雷[2] 曾德林[2] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]广西玉柴机器股份有限公司技术中心,玉林537005

出　　处：《内燃机工程》2009年第3期51-56,共6页Chinese Internal Combustion Engine Engineering

摘　　要：在台架试验的基础上,采用一维发动机工作过程计算和三维CFD模拟技术研究了4缸柴油发动机各缸排气温度差异的影响因素。模拟结果表明:台架试验测量的各缸排温差异是受各缸工作过程、测量点位置和排气歧管结构的综合影响,其中排气歧管结构是主要的影响因素。排温测量点位置越接近排气门,越能反映缸内的热负荷状况。基于数值模拟结果,优化了原发动机排气歧管,并提出了排气歧管优化策略。On the basis of engine bench test, 1D engine cycle simulation and 3D computational fluid dynamics（CFD） technology were adopted on a four cylinder diesel engine to investigate the effecting factors resulting in different exhaust gas temperature in each cylinder. The simulated results show that the exhaust temperature difference is caused by combined effects of the working process in each cylinder, the sensor position and exhaust manifold design, among which exhaust manifold design is the most important factor. The closer to the exhaust valve the sensor position is, the more exact the measured value is, which will represent the real thermal loading condition in the cylinder. Based on the simulated results, the original exhaust manifold was optimized. A strategy for exhaust manifold optimization was proposed.

关 键 词：内燃机 数值模拟 排气温度 排气歧管 优化策略 

分 类 号：TK421.3[动力工程及工程热物理—动力机械及工程]