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超高速流动是飞行器再入大气层时所面临的高速高温流动环境,膨胀管是少数几种能模拟超高速流动的地面设备之一。采用数值模拟方法对超高速试验进行辅助分析诊断,流动模拟时热化学反应模型的选择对流场特性影响较大,分别选择5组分、11组分热平衡及5组分热非平衡模型,对比研究3种不同热化学反应模型对双楔试验模型数值模拟结果的影响,以进一步评估超高速流动模拟时热化学反应模型的适用范围。结果表明,试验气流条件下5组分化学模型即可满足要求,加速气流条件则必须采取11组分化学模型,而对于流动中热非平衡效应显著时,热化学非平衡模型更为适用。
Ultra-high-speed flow is the high-temperature and high-temperature flow environment the aircraft encounters when it enters the atmosphere. Expansion tubes are one of the few ground-based devices that can simulate ultra-high-speed flow. The numerical simulation method is used to diagnose the ultra-high-speed test. The choice of the thermochemical reaction model has a great influence on the flow field characteristics. Five components, 11 components and 5 components of thermal unbalance model are selected respectively. The effects of three different thermo-chemical reaction models on the numerical simulation results of the double-wedge test model are studied to further evaluate the applicability of the thermochemical reaction model in ultra-high-speed flow simulation. The results show that the chemical composition of the five components can meet the requirements of the experimental flow conditions, the chemical composition of the 11 components must be taken to accelerate the flow conditions, and the thermochemical imbalance model is more suitable for the non-equilibrium heat flow.