旋成体表面防热的发汗冷却控制及其数值模拟

研究高超声速旋成体表面防热的发汗冷却控制系统,除去得到与平面情形相当的临界发汗通量之外,还得出另一个较小的第二临界发汗通量.当发汗通量介于这两个临界发汗通量之间时,表面虽将出现烧蚀,但烧蚀会自动停止,留有剩余厚度.还进行了数值模拟,给出各种特性曲线;详细讨论了对热层表面烧蚀控制的三种方式:表面温度的控制、表面烧蚀量的控制和表面烧蚀开始时间的控制,给出控制变量选取的准则.

THE TRANSPIRATION COOLING CONTROL AND IT'S NUMERICAL SIMULATION OF SURFACE THERMAL PROTECTION FOR BODIES OF REVOLUTION

The transpiration cooling control system of surface thermal protection for bodies of revolution at hypersonic is studied. Not only the critical transpiration quantity equaling to plane case is obtained, but also another smaller second critical transpiration quantity is found. When the transpiration quantity is between of this two critical transpiration quantities, the ablation will appear on the shield surface, but the ablation will stop automatically, and a remainder thickness of shield will be kept at last. Numerical simulation is accomplished and yields all kinds of charactdstic curves. Three methods of ablation control for shield surface are discussed:the controls are for surface temperature, for ablation quantity and for ablation beginning time, the rules for selecting control variable are given.