摘要
为了降低柴油机气缸盖的热负荷,以重载柴油机气缸盖为研究对象,进行了缸盖底部温度测量实验,并建立了发动机一维工作过程计算与缸盖内三维流动、传热与应力的多场耦合仿真模型,在此基础上提出了优化鼻梁区冷却通道尺寸并削薄缸盖底板的优化设计措施.结果表明:改进措施使该气缸盖的最高工作温度由336.3℃降低为325.7℃,最大热机耦合应力由498 MPa降低为491 MPa,有效降低了气缸盖的热负荷.
Temperature of the cylinder head bottom in diesel engines was measured to study how reducing the thermal load of the cylinder head.Multi-field coupled simulations of 1D engine thermodynamics simulation in conjunction with 3D flow,heat transfer and stress simulation in the cylinder head were performed on a heavy duty diesel engine.An improved structure of the cylinder head containing the optimization of the dimensions of the valve bridge passages and the thinning of the cylinder head bottom plate was proposed.The results show that the maximum temperature and the maximum thermal-mechanism coupling stress have been reduced,which lead to decreasing the thermal load of the cylinder head.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第8期10-13,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家高技术研究发展计划资助项目(2008AA11A121)
关键词
重载柴油机
气缸盖
热负荷
温度测量
耦合仿真
heavy duty diesel engine
cylinder head
thermal load
temperature measurement
coupled simulation
