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定常激波反射分为规则反射和马赫反射,在不同条件下2种反射结构之间会相互转变。高超声速流动中的激波反射问题常面临高温气体效应,随着温度逐渐升高,最先出现的是空气分子振动激发。通过理论分析和定量计算,研究了振动激发对激波反射及其转变规律的影响。首先给出考虑振动激发的空气热力学模型,并分析其与量热完全气体的差异以及对激波关系的影响;接着分析在规则反射和马赫反射中,振动激发对激波反射流场的影响规律;最后讨论振动激发对激波反射转变2个准则点的影响。研究结果表明,振动激发使激波极线的整体轮廓变大,且这种差异在经过一次激波反射之后被明显放大,会对激波反射的流场产生重大影响;对于激波反射的转变,振动激发使转变的2个准则点都变大,且对规则反射向马赫反射转变的脱体准则影响更大。
The regular shock reflections are divided into regular reflection and Mach reflection, and under different conditions, two kinds of reflection structures will change each other. The shock wave reflection problem in hypersonic flow often faces the effect of high temperature gas. As the temperature gradually rises, the first one is the vibrational excitation of air molecules. Through theoretical analysis and quantitative calculation, the influence of vibration excitation on shock reflection and its transformation is studied. Firstly, the air thermodynamic model considering vibration excitation is given, and the difference between it and complete calorimetry gas and its influence on the shock wave are analyzed. Then, the regularity of the influence of vibration excitation on the reflection flow field of shock wave is analyzed. Finally, the influence of vibration excitation on two criteria points of shock reflection transition is discussed. The results show that vibration excitations make the overall outline of the shock polar line larger, and this difference is significantly magnified after a shock wave reflection, which will have a significant impact on the flow field of the shock wave reflection; for shock reflection transition Vibrational excitation makes the two criterion points of the transformation larger, and has a greater influence on the prolapse criterion of the rule reflection to Mach transformation.