某乘用车制动盘冷却特性的研究

Brake Disc Cooling Characteristics of a Passenger Car

摘要:

基于某SUV的整车环境，利用数值计算和热环境风洞（CWT）试验的方法，探索了重复制动工况下制动盘的温升和冷却过程，分析了制动盘冷却过程中的散热方式以及冷却特性.结果表明,计算流体力学（CFD）得到的温升和冷却特性曲线与试验结果的一致性较好；对流散热是影响制动盘冷却性能的主导因素；制动盘的温度随冷却时间呈指数关系下降，冷却系数随汽车来流速度呈幂律关系增长.

Abstract:

A computational fluid dynamics (CFD) simulation was performed on a brake disc of an SUV during the repetitive braking and cooling process. The temperature rising and drop procedure were numerically investigated compared with the climatic wind tunnel (CWT) test, and the brake cooling characteristics was specifically analyzed based on the heat transfer theory. The results show that the CFD simulation and the experiments are in good agreement. The convection heat transfer acts as a key factor for the cooling performance of the brake. The temperature drop for brake disc exhibits an exponential function of the cooling time, while the cooling coefficient shows a power law increase with the oncoming velocity of the vehicle.