高旋转数下45°斜肋回转通道平均换热特性研究

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为了更加深入地研究涡轮叶片回转通道的换热特性,研究了高旋转数下带45°斜肋回转通道的平均换热特性。在通道进口雷诺数从10000~70000,旋转数从0~2.07的范围内,实验研究了旋转状态下,方形截面带45°斜肋U型通道径向出流与径向入流两个流程四个侧面在0°,22.5°和45°三个安装角下的平均换热系数。研究结果表明:45°斜肋增强了通道换热,减弱了旋转对换热的影响;由于浮升力作用在肋间二次流上,导致通道内外侧出现临界回流现象;转角减弱了第一通道旋转对换热的影响,增强了第二通道旋转对换热的影响,其影响在低旋转数下并不显著,在高旋转数下开始变得明显。 In order to study the heat transfer characteristics of turbine blade rotating channel more deeply, the average heat transfer characteristics of the rotating channel with 45 ° inclined rib at high rotation speed were studied. In the channel inlet Reynolds number from 10000 to 70000, the number of revolutions from 0 to 2.07, the experimental study of the rotating state, the square section with 45 ° inclined U-shaped channel radial outflow and radial inflow of two processes four Side of the 0 °, 22.5 ° and 45 ° three installation angle of the average heat transfer coefficient. The results show that the 45 ° inclined rib enhances the channel heat transfer and weakens the effect of rotation on the heat transfer. Due to the floating force acting on the intercostal secondary flow, a critical backflow phenomenon occurs inside and outside the channel. The effect of rotation on heat transfer enhances the effect of rotation of the second channel on heat transfer, the effect of which is not significant at low spin speeds and becomes noticeable at high spin speeds.
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