Thermal dissipation analysis of carbon ceramic brake discs in complex environments under high-speed trains
Thermal impact on both the brake discs and the their surrounding environment exists due to the rapidly increased tempera-ture of the carbon ceramic brake discs when braking under high-speed. Aiming at the problem of heat dissipation of carbon ceramic brake discs under high speed braking conditions,a heat dissipation model of carbon ceramic brake discs that incorporated the complex environment beneath the train was established via thermo-fluid-solid coupling simulation method. The model was used to analyze the thermal load capacity of the carbon ceramic discs under emergency and routine braking conditions,as well as the impact of the temperature rise of the carbon ceramic brake discs on the surrounding environment. The research findings indicate that under emer-gency and routine braking conditions with an initial braking speed of 400 km/h,the disc surface maximum temperature exceeded 740 ℃,with a higher rate of temperature increase observed under emergency braking conditions. Thermal conduction occurred between the friction surface and the cooling ribs of the brake disc,resulting in a petal-like temperature distribution on the brake disc's friction surface. A significant temperature elevation of the air inside the brake disc during braking and a substantial temperature change in the air domain directly above the brake disc after braking were observed.
万方数据
维普
