轴向通流旋转盘腔流动换热稳态实验与数值模拟

通过开展稳态实验及数值模拟探究了轴向通流旋转盘腔的流动结构与换热特性。通过改变流量系数、旋转雷诺数等参数，探究不同工况下旋转盘两侧及盘罩内侧壁面温度和努塞尔数的径向分布规律。结果表明:在轮缘加热的状态下，旋转盘两侧温度径向分布均呈凹函数形态，且旋转盘迎风面换热强度普遍高于背风面；后轴颈盘罩向两端旋转盘导热，其壁面温度径向分布呈"中间高、两侧低"的状态；随着轴向流量系数的增大，盘腔内部气体对流加剧，径向臂及涡对结构更加明显，旋转盘及轴颈表面换热效果增强；旋转盘腔内的流动换热特性受强迫对流和类Rayleigh-Benard对流2种机理的共同影响。 

Steady-state experiment and numerical simulation on flow and heat transfer of a rotating cavity with axial flow

The steady-state experiment and numerical simulation were carried out to investigate the flow structure and heat transfer characteristics in the rotating cavity with axial flow. By changing the axial flow coefficient, rotating Reynolds number, etc., the radial distribution of temperature and Nusselt number on both sides of the disk and the inner side of the disk cone under different working conditions was explored. The results show that: the radial distribution of temperature on both sides of the disk is concave, and the heat transfer intensity on the upwind side of the disk is generally higher than that on the leeward side. The cone disk conducts heat conduction to the disks on both ends, and the radial distribution of the wall surface temperature is high in the middle and low on both sides. With the increase of the axial flow coefficient, the gas convection inside the disk cavity was intensified, the radial arm and vortex pair became explicit, and the heat transfer effect on the surface of the rotating disk and the cone disk was enhanced. The flow heat transfer characteristics in the cavity of the rotating disk are influenced by forced convection and Rayleigh-Benard like convection.