"A Study on Effects of High Temperature Chemical Reactions on Shock Induced Aerodynamic Heating of Hypersonic Vehicle"

本研究的目的是研究高温对高超声速飞行器周围激波诱导的气动加热现象的影响。主要研究结果如下：1)研究了高温作用下振动能和平动能的作用。在内能振动中考虑了能量。对于温度模型，假设了振动的平衡条件。利用该模型对激波诱导的气动加热现象进行了数值模拟。对有无振动能的计算结果进行了比较。结果表明，有振动能的气动加热载荷远高于无振动能的气动加热载荷，振动能的高温效应对气动加热载荷的精确预测具有重要意义。2)考虑高温模型的离解反应。计算得到的含氧气体离解反应的激波反射图形与实验结果吻合较好。对于壁面的催化条件，考虑了完全催化壁面条件和完全非催化壁面条件，并对其进行了校核。全催化壁面的气动热负荷远高于非催化壁面。这意味着在(总加热负荷)=(气动加热负荷)+(化学反应附加加热负荷)的公式中，(化学反应附加加热负荷)有时会变得比(气动加热负荷)高。在计算中还考虑了空气(80%的氮气和20%的氧气)，并与实验取得了很好的一致。以上结果表明，高温效应对气动热负荷的预测是非常重要的。

The purpose of the present study is to study of high temperature effects on shock wave induced aerodynamic heating phenomena, which are observed around vehicles at hypersonic speed. The major results obtained in the present study is as follows :1) As high temperature effects the roles of vibration energy and translational energy are studied. In the internal energy vibrationa energy is considered. For the temperature model vibrationa equilibrium condition is assumed. Numerical simulation on shock wave induced aerodynamic heating phenomena with this model have been conducted. Calculated results with and without vibration energy have been compared. The results show the aerodynamic heating loads with vibrational energy is much higher than that without energy and high temperature effect of vibrational energy is very important for precise prediction of aerodynamic heating loads.2) As high temperature model dissociation reaction is considered. Calculated shock wave reflection patterns with dissociation reaction of oxygen gas show good agreement with experiments. Also for the catalytic condition of the wall both of fully catalytic and fully non-catalytic wall conditions have been considered and checked each other. Aerodynamic heating load with fully catalytic wall is much higher than that of non-catalytic wall. This means in the formula of (total heating loads) = (aerodynamic heating load) + (additional heating load due to chemical reactions), (additional heating load due to chemical reactions) sometimes becomes higher than (aerodynamic heating load).In the calculations air (80% nitrogen gas and 20% oxygen gas) is also used and good agreements with experiments have been obtained. Those above results show high temperature effects is very important for prediction of aerodynamic heating loads.