间冷回热循环发动机间冷器流动换热性能试验

Heat transfer performance of intercooler for an intercooled and recuperated cycle engine

试验获取了各个状态下间冷器试验件冷气、热气通道进出口气流的总温、总压等参数,进而获得间冷器的流动阻力特性和换热特性。评估了间冷器流动换热性能,并与理论计算结果进行对比分析。结果显示:热气通道流体压力损失系数理论计算值与试验值吻合良好;冷气通道压力损失系数随冷气雷诺数的增加逐渐降低,理论计算值低于试验值;随着冷气流量的增大,间冷器换热效率先降低,当间冷器冷气通道流量大于热气通道流量时,换热效率开始逐渐升高;换热效率理论设计值与试验值误差较小,换热效率随着热气冷气温比的增大先略有升高,随后基本保持不变。

The states of intercooler inlet and outlet air condition for cold and hot sides,including total temperature、total pressure were obtained through experiment to get the intercooler flow resistance and heat transfer characteristics.The heat transfer performance was evaluated and compared with theoretical calculation results.It shows that hot side loss coefficient of theoretical calculation results are in good agreement with test results;the cold side loss coefficient gradually decreases with the increase of Reynolds number,and the theoretical calculation value is lower than the tests value.With the increase of mass flow in cold side,the heat transfer efficiency of intercooler reduces firstly,when the mass flow of cold side is more than that of hot side,the heat transfer efficiency begins to rise.The error between the theoretical valve and tests value is small,and the heat transfer efficiency slightly increases with the ratio of hot and cold air temperature increase,then the efficiency basically remains unchanged.