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通过提高回转通道内气体压力到500 kPa以上,显著扩展了实验参数范围.实验雷诺数Re和旋转数Ro范围分别为10000~70000和0~2.08,完全匹配了真实发动机的Re和Ro.在此基础上实验研究了高旋转数下方截面光滑U型通道的换热特性.结果表明,在高旋转数下,旋转效应对通道进口和转弯段局部换热的影响比进口效应和弯道效应显著;第1通道后缘面换热随旋转数的增大而增强,而中下游前缘面在超过临界旋转数后换热增强;高旋转数下第2通道下游后缘面的换热强于前缘面.
By increasing the gas pressure in the swirl channel to over 500 kPa, the range of experimental parameters is significantly expanded.The Reynolds number Re and the number of revolutions Ro range from 10000 to 70000 and from 0 to 2.08, respectively, which exactly match Re and Ro of the real engine The experimental results show that the effect of rotation on the local heat transfer at the entrance and corner of the channel is more significant than that of the inlet and the curve at high rotational speed. The heat transfer on the trailing edge of the first channel increases with the increase of the number of revolutions, while the heat transfer increases when the number of revolutions exceeds the critical number of revolutions. The heat transfer of the trailing edge of the second channel at high revolutions is stronger than that of the former Edge.