旋转U型通道流动与换热特性的数值研究

发布时间：2018-10-04 19:00

【摘要】：应用k-ωSST(shear stress transport)湍流模型,计算分析旋转U型通道在不同进口雷诺数(10 000~60 000)和高旋转数(0~2.013)范围内的流动与换热特性.结果表明:在静止和旋转状态下,进口雷诺数越大,努塞尔数越大.相比于同一工况下的静止状态,旋转显著增强了径向外流直通道的换热强度,径向内流直通道换热强度增大不明显.旋转数对U型通道换热的影响主要通过改变哥氏力和浮升力的大小.受哥氏力的影响,径向外流直通道后缘面换热增强,前缘面换热减弱.浮升力诱发了近壁面的流动分离,使得径向外流直通道前缘面不同位置处的换热强度随旋转数的增加而先减小后增大,计算得到的临界旋转数变化规律与实验测量结果保持一致,即无量纲距离参数与临界旋转数的乘积为定值.
[Abstract]:By using k- 蠅 SST (shear stress transport) turbulence model, the flow and heat transfer characteristics of rotating U-shaped channels at different inlet Reynolds numbers (10 000 ~ 60 000) and high rotation numbers (0 ~ 2. 013) are calculated and analyzed. The results show that the larger the inlet Reynolds number is, the larger the Nusselle number is in the static and rotating states. Compared with the stationary state in the same working condition, rotation significantly enhanced the heat transfer intensity of the radial outflow straight channel, but the heat transfer intensity of the radial inward flow straight channel was not obvious. The effect of rotation number on the heat transfer of U-channel is mainly by changing the magnitude of Coriolis force and floating lift. Under the influence of Coriolis force, the heat transfer at the rear edge of the radial outflow straight channel is enhanced, but the heat transfer on the front edge is weakened. Floating lift induces flow separation near the wall, which makes the heat transfer intensity decrease first and then increase with the increase of rotation number. The calculated law of critical rotation number is consistent with the experimental results, that is, the product of the dimensionless distance parameter and the critical rotation number is a definite value.
【作者单位】：北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室;
【分类号】：V231.1

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