关键词: MPCCI, 对流换热, 流固热耦合, 台架试验, 通风盘

Abstract: The brake progress of automobile ventilated disc shows a significant phenomenon of fluid-solid-thermal physics field coupling. To enhance the calculation accuracy of brake temperature field and stress field, the tight coupling and loose coupling algorithms are integrated used. The synchronous iteration of ABAQUS (solid model) and FLUENT (fluid model) solver and the real-time sharing of coupling parameters are realized by MPCCI data exchange platform, which means complete coupling calculation of temperature field, stress field and air flow field, and Link3900 NVH bench test platform is used to verify the calculation results of temperature field. The moving region of the fluid model is treated by the slip mesh technique, and the turbulent model is selected by RNG k-epsilon model. The non-equilibrium wall method is used to solve the boundary layer, and the y+ value of the first layer grid node is near 30-60. In view of the structural characteristics of the end and rib of the ventilated disc, the nodal paths of different directions are set up, and the variation of temperature, stress and convection heat transfer coefficient along the different directions are obtained. The bench test results show that the transient temperature of the corresponding node have good matching with the experimental value, and the average deviation is less than 4%. The research program effectively ensures that the calculation accuracy and efficiency of the whole model, and provides an important basis for the optimal design of ventilated disc brake.

Key words: bench testing, convection heat transfer, fluid-solid-thermal field coupling, MPCCI, ventilated disc