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在电弧风洞中开展材料特性考核试验时,一般根据部分相似模拟理论,通过模拟飞行条件的总焓和表面压力模拟气动热环境。分析了部分相似模拟的适用条件,并通过数值求解二维轴对称热化学非平衡粘性激波层方程,计算了两种不同尺度球头模型的流场特性,分析了试验状态对飞行条件热环境的模拟程度和对材料性能评价的影响。研究表明,对于热化学非平衡流场,特别是对于表面催化系数较低的热防护材料,采用部分相似模拟理论开展试验,气动热环境模拟程度下降,并且由于热焓比例偏小,对高温耐烧蚀材料的考核程度偏低。
In the test of material property in arc tunnel, the general thermal environment is simulated by simulating the total enthalpy and surface pressure of flight conditions according to the partial analogy theory. The applicable conditions of some similar simulations are analyzed. The two-dimensional axisymmetric thermochemical non-equilibrium viscous shock wave equations are numerically solved to calculate the flow field characteristics of two different spherical head models. The influence of experimental conditions on the thermal conditions of flight conditions The degree of simulation and the impact on material performance evaluation. The research shows that for the thermochemical non-equilibrium flow field, especially for the thermal protective material with lower surface catalytic coefficient, the experiment is carried out by using some similar simulation theories, the degree of aerodynamic thermal environment simulation is decreased, and due to the small proportion of enthalpy, Low degree of assessment of ablative materials.