强化缸盖鼻梁区传热的水腔表面结构设计研究

In view of the serious heat load in the bridge zone of the cylinder head of a high reinforced diesel engine, 8 different special structural surfaces were established to strengthen its heat transfer capacity in the cooling water jacket of the region. The simulation analysis of flow and heat transfer in the simplified channel of 8 different structural surfaces was carried out by using Euler multiphase flow and wall boiling heat transfer model. A flow boiling experimental platform was also designed to verify the reliability of the simulation. On this basis, the degree of disruption of the surface flow of various structures and the influence on the heat transfer coefficient were studied. Finally, a comprehensive evaluation of the heat transfer capacity of the various structures was performed. The results show that the special surface structure has different influence on the turbulence intensity and the surface heat transfer coefficient, in which the surface of the column structure and the surface of the two type groove ribs are 4.9 times higher than that of the turbulence intensity. The enhancement of heat transfer coefficient of the fork-row column structure and the surface of the vertical rib structure are increased by 65.9% and 57.4%, respectively. And in the comprehensive evaluation of heat transfer ability, the above three structures can reduce about 23℃ of the maximum temperature of the fire surface.