高速列车制动盘表面对流换热系数的研究进展

The research progressof convective heat transfer coefficient on the surface of the high-speed train brake disc

随着列车运行速度的提高,动能急剧增加,制动时产生的热能也大大增加,巨大的制动热负荷使制动盘产生很大的温度梯度,因此,制动盘在表面的对流换热系数的大小,直接影响制动盘在制动过程中的散热程度。如果制动盘各表面散热不好,则容易发生制动失效和热裂纹等。因此,很多学者通过数值和实验的方法得到制动盘表面对流换热系数的规律。文章将详细介绍制动盘表面对流换热特性的研究现状,并对最新的研究现状作了分析。

With the increasing of the train speed, the kinetic energy of train increases sharply, the heat energy generated by breaking is also greatly increased,the huge heat load produced by breaking of the brake disc makes large temperature gradient, thus the convective heat transfer coefficient on the surface of the brake disc affects the degree of heat transfer directly in the process of braking.If the heat transfer on the surfaces of the brake disc is very weak, it leads to various thermal cracks, brake failure and so on. Therefore, many researchers get the law of the convective heat transfer coefficient on the brake disc surface through numerical and experimental methods. This paper will present the research status of convective heat transfer characteristics on the brake disc surface detailly and analyse the latest research status.