射流冲击对旋转圆盘换热特性的影响

Effects of Jet Impingement on Heat Transfer Characteristics of Rotating Disk

摘要: 为揭示射流冲击对旋转圆盘换热特性的影响，基于K-Epsilon湍流及可实现的K-Epsilon模型，利用STAR-CCM+对不同喷嘴孔径、射流雷诺数、旋转雷诺数、冲击距离、喷射角度、喷射位置等因素作用下的旋转圆盘换热进行了研究，并与实验对比验证了仿真方法。研究表明：射流雷诺数增大，圆盘换热增强；换热面积较大时，宜采用孔径大的射流；射流距离与喷嘴孔径之比存在最佳值;在高旋转雷诺数时，换热系数增幅较缓；存在最佳喷射角度及位置使圆盘平均温度为最小。

Abstract: To investigate the effect of the jet impingement on the heat transfer characteristics of rotating disk, the heat transfer of rotating disk under different nozzle aperture, jet Reynolds number, disk Reynolds number, impact distance, injection angle and injection position was studied by using STAR-CCM+ software based on K-Epsilon turbulence and achievable K-Epsilon model. The simulation method was verified by comparing with experimental results. The results show that as the Reynolds number of the jet increases, the heat transfer increases. When the heat transfer area is large, the jet with a large aperture should be adopted. The ratio between injection dis-tance and nozzle aperture has the best value. When the disk Reynolds number is high, the heat transfer coefficient increases slowly; there is the best injection angle and injection position to make the average temperature of disk be the minimum.