关键词: 流固耦合；传热系数；热应力；热应变

Abstract: This paper validates the thermal strength due to the structure change of a diesel engine cylinder head. First, using GT-Suite analyzes the 1D thermal analysis to get temperature and heat transfer coefficient on the boundary of fuel-side, intake and exhaust port. Secondly, using Star CCM+ analyzes the cooling appearance to get the temperature of solid and fluid field, the heat transfer coefficient on water jacket surface. Finally, analyzes the thermal stress and strain, of which the cylinder head temperature field is the thermal load. The results shows the cylinder head, especially the nose bridge, meet the structure design requirements. This simple and efficient method computes the temperature and heat transfer coefficient to analyze the thermal strength, for which not only to evade the inaccuracy of empirical value, but also reduce the simulation intensity to support the design reference and complete the analysis of object.

Key words: fluid-solid coupling; heat transfer coefficient; thermal stress; thermal strain