长下坡工况中通风制动盘热性能的仿真分析

汽车在长下坡工况中,驾驶员需要通过轻踩刹车,使得汽车维持安全稳定的速度下坡,此时的制动盘处于拖磨的状态,温度会不断上升,极有可能产生制动热衰退的风险.为了研究在长下坡工况中制动盘的温升情况,本文基于fluent仿真软件,对几种不同的坡度、车速和车重的长下坡工况中的通风制动盘的热性能进行仿真分析,得出了制动盘在长下坡拖磨工况中的盘体温度场及温升曲线,确定了坡度、车速和车重增大均使制动盘温升速率增大,而车速增大会使制动盘对流换热加强,最终制动盘温升速率会随时间推移逐渐减小,对设计汽车长下坡工况中制动器性能有参考作用.

Simulation Analysis of Thermal Property of Vented Brake Disk during Long Downhill Condition

The driver has to keep braking during downhill condition to maintain the safe speed .The brake disc is being rubbed and the temperature will keep rising , likely to cause brake heat fade .To find out tempera-ture rising curve of brake disk during long downhill condition , the thermal properties of brake disk were simula-ted and analyzed under several different slopes , speeds and weights of the long downhill condition with fluent . Body temperature field and temperature rising curve of brake disk were estimated .It is sure that the temperature rising rate of brake disk increases if the slope , speed and vehicle weight increase , the speed increases the con-vection heat transfer enhancement of brake disk , and the temperature rising rate will decrease with time , which will be useful in designing automobile brake performance in long downhill condition .