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通过数值分析研究了化学非平衡效应对气动加热问题的影响。分别以量热完全气体、单组分热完全气体和5组分化学非平衡气体为气体模型,计算了圆柱钝头的绕流流场和壁面热流密度分布,比较并分析了高温化学非平衡效应对流场特性,尤其是气动加热特性的影响。结果分析表明,高温化学非平衡效应可使激波层变薄,激波层内温度大幅下降,从而会严重影响气动热环境特性,是影响高超声速飞行器热防护设计的重要因素。
The effect of chemical unbalance effect on the problem of aerodynamic heating was studied by numerical analysis. The distributions of the flow around the cylinder and the heat flux on the wall of the cylinder are calculated respectively by the calorimetric complete gas, the one-component hot complete gas and the five-component chemical non-equilibrium gas as the gas model respectively. The chemical unbalance effect Effect on flow field characteristics, especially aerodynamic heating characteristics. The results show that the chemical non-equilibrium effect of high temperature can make the shock layer thinner and the temperature in the shock layer drop significantly, which will seriously affect the aerodynamic characteristics of the thermal environment, which is an important factor affecting the thermal protection design of the hypersonic vehicle.