不同排气系统三通结构流动规律的试验和计算研究  

Experimental and Computational Studies on Three-Way Pipe Design in Different Exhaust Systems

作　　者：尹鸿儒 崔毅[1] 石磊[1] 邓康耀[1] 程江华[2] 刘胜[2] 

机构地区：[1]上海交通大学内燃机研究所,上海200240 [2]中国北方发动机研究所,大同037036

出　　处：《内燃机工程》2014年第4期66-72,共7页Chinese Internal Combustion Engine Engineering

基　　金：国防基础科研计划资助项目(B0920110003)

摘　　要：针对发动机排气系统三通模型,通过高马赫数下的稳态吹风试验验证了FLUENT模拟计算模型的精度,结果表明模拟与试验吻合较好,精度较高。通过三维计算,分析了模件式脉冲转换器(MPC)和模件式多功能脉冲转换器(MMPC)两种排气系统的三通结构在不同工况下的流场和流动损失规律。计算结果表明:在扫气工况下,MPC系统的可用能损失比MMPC系统小很多,在排气工况下,MMPC系统的可用能损失比MPC系统小;两种系统排气支管间的排气压力波传递情况,表明总管质量流量越大,压力波动对相邻支管的干扰越大,在相同的工况下,MPC系统的支管压力变化对相邻支管的影响要比MMPC系统大,即MMPC系统抗扫气干扰能力更强。Steady flow tests at high Mach number were made to verify accuracy of the FLUENT simulation on exhaust system three-way pipe design. Results show that the calculation and experiment results agreed well each other. 3D calculation of flow field and flow loss in different conditions for MPC and MMPC systems show that in scavenging condition, the flow loss of MPC system is much less than MMPC system, while in exhaust condition result is just opposite. Analysis of exhaust pressure wave propagation in branch pipes reveals that the larger the main pipe mass flow, the greater the pressure wave influence on adjacent branch pipes. In the same condition,the variation of MPC system branch pipe pressure has more influence on adjacent pipes than MMPC system,i, e. MMPC system has stronger ability against the scavenging interference.

关 键 词：内燃机 柴油机 排气系统 模件式脉冲转换器 模件式多功能脉冲转换器 

分 类 号：TK423[动力工程及工程热物理—动力机械及工程]