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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.
The finite element simulation technology is applied to the steady-state heat transfer and thermo-mechanical coupling analysis of the engine to study the influence of heat load on the stress distribution and sealing performance of the diesel engine parts.A finite element heat transfer model of the main components of the 1130 diesel engine is established, Conditions and loads, the temperature field distribution of each component is calculated.The influence of temperature field on engine sealing under thermal stress conditions is analyzed by means of finite element method.Temperature field makes cylinder head bolt tension and cylinder gasket pressure greater Which will help to improve the sealing performance.Compared with the mechanical load condition, the stresses of the cylinder liner and the cylinder head obviously increase under the condition of thermo-mechanical coupling, which shows that the role of thermal load should not be ignored in the calculation of the cylinder head and cylinder liner strength.