【摘要】 汽车发动机经常在非稳态的过渡工况下工作 ,即启动、暖机、突加和突减工况。本文对车用风冷发动机汽缸盖的非稳态温度进行了实测 ,分析了启动、突加和突减三种过渡工况下汽缸盖温度的变化规律。实测结果表明 :汽缸盖内、外表面的温度变化规律有很大差别 ,启动工况对热负荷可靠性影响最大。同时 ,实测结果也为汽缸盖温度场、热应力计算提供了真实可靠的边界条件更多还原

【Abstract】 The automobile engine is usually worked under non steady state of transient operating conditions,i.e. starting, warming ,suddenly loading and unloading.This paper measured the non steady state temperature field of cylinder head in an air cooled engine.It analysed the temperature variation under transient operating conditions of engine.The results indicated that there is a great difference between the temperatures in inner and outer surface of cylinder head.The starting operation condition had a most important effect on reliability under thermal load.At the same time, the reliable boundary conditions can be provided by calculating the temperature and stress fields.更多还原