某发电机组用柴油机排气歧管热应力仿真与分析  

Simulation and analysis of exhaust manifold thermal-stress for diesel engine, genset

作　　者：王军 刘配勇 王兴国 Wang Jun;Liu Peiyong;Wang Xingguo(Jiangsu Kangwo Power Technology Co.,Ltd.,Jiangsu Kunshan 215300)

机构地区：[1]江苏康沃动力科技股份有限公司,江苏昆山215300

出　　处：《汽车实用技术》2018年第18期123-126,共4页Automobile Applied Technology

摘　　要：所研究的发电机组用柴油机属于重型大排量V型柴油机。由于对该平台的发动机进行了优化升级,发动机结构存在部分设计变更,为保证发动机运行的可靠性,需对排气歧管在高温热载荷下的强度进行验证分析。利用仿真技术对排气歧管进行了计算,其中涉及到了发动机性能、流动、传热以及热应力多个物理计算过程,最终得出了排气歧管热应力分布情况。通过评估,排气歧管大部分区域的热应力小于屈服极限,满足工程要求,但在加强筋区域存在局部应力集中现象,建议取消加强筋。The being studied diesel engine which used as genset in power stations is a heavy duty diesel engine with V shape and big displacement. Due to the optimization and upgrading of the engine, there’re some design changes in its structure. In order to ensure the reliability of the engine, the strength of the exhaust manifold should be verified and analyzed under the high temperature load. The simulation technology is used on the analysis of exhaust manifold,The simulation includes multiple physical processes, such as, engine performance, flow, heat transfer and stress-strain. Finally, the distribution of heat stress of exhaust manifold was obtained. Through evaluation, the thermal stress in most areas of the exhaust manifold is less than the yield limit and meets the engineering requirements. However, there exists local stress concentration in the reinforcing rib area, and it is suggested to be eliminated.

关 键 词：排气歧管 热应力 V型柴油机 

分 类 号：U467[机械工程—车辆工程]