分离流中旋涡运动的热行为及其控制的数值模拟

以压缩拐角流动为例，对分离流中旋涡运动的热行为及其控制进行了数值模拟研究。研究结果表明，光滑表面上流动的分离特性及其热行为受到壁面温度的极大影响，提高壁面温度可以使分离点前移，再附点后移，分离范围扩大，涡心提高，而再附点附近及峰值热流则经历了一个先上升后下降的非单调变化过程；分离区和现附点附近的温度型与附着流差别明显，具有很高的峰值和很靠近物面的峰值点，从而造成高热流。而且温度梯度随壁温的不敏感性

Numerical Study of Thermodynamic Features and Their Control in Separated Flows

In this paper the thermodynamic features and their control in separated flows are studied with numerical method. The numerical study shows that, the separation and thermodynamic features are greatly affected by the body wall temperature, with increasing of wall temperature, separation point moves upstream and reattachment point moves downstream, separation region extends and center of vortex raises, the heating flux near reattachement point and its peak value increases first and then decreases. The temperature profiles at separated and near reattachment points region are remarkaldy different with that of attached flow, and have very high peak and the peak point very near the wall, therefore make the heating flux very high. Also the temperature gradients are not sensitive to wall temperature, perhaps this is the main reason for nonmonotonous changing of heating flux peak.