热负荷对柴油机结构强度及密封性能的影响  

Thermal load influence on stress intensity and sealing performance of diesel engine

作　　者：杨陈[1] 郝志勇[1] 陈馨蕊[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2010年第4期756-760,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50575203)

摘　　要：将有限元仿真技术应用到发动机稳态传热和热机耦合分析中,研究热负荷对柴油机各部件应力分布及密封性能的影响.建立1130型柴油机主要部件的有限元传热模型,施加合理的边界条件和载荷,计算得到各组件的温度场分布.借助有限元方法,分析在热应力工况下温度场对发动机密封性的影响.温度场使得缸盖螺栓张力和气缸垫片压力变大,有助于改善密封性.与机械载荷工况进行对比,在热机耦合工况下气缸套和气缸盖的应力明显变大,说明在气缸盖、气缸套的强度计算中不应忽视热负荷的作用.Finite element simulation technology was applied to the steady heat transfer and thermomechanical coupling analysis in order to investigate the influence of thermal load on stress intensity and sealing performance.An finite element heat transfer model of 1130 diesel engine assembly was set up,based on which the steady heat transfer analysis was performed subsequently by applying reasonable boundary conditions and loads.The influence on engine sealing performance due to thermal field under the thermal stress conditions was evaluated by using the finite element method.The results showed that the thermal load increases the bolt tensile force and the gasket pressure,which help to improve the sealing performance.Compared to the mechanical load case,the thermomechanical stress of the liner and the cylinder head is obviously increased,so the thermal load is not neglectable when calculating the stress intensity of the cylinder head and the cylinder liner.

关 键 词：柴油机 机体组件 有限元方法 热机耦合 稳态传热 

分 类 号：TK423.1[动力工程及工程热物理—动力机械及工程]