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以OREX(orbital reentry experiment vehicle)的飞行试验数据和相关的CFD数值模拟结果为基础,采用传热理论及相关公式,分析计算了OREX再入大气层过程中的轨迹,驻点处热流密度非平衡假设和平衡假设下的换热问题.所计算的轨迹、热流密度非平衡假设下计算的驻点温度和热流密度值同试验数据及相关的CFD数值结果取得了很好的一致,相应的计算方法可作为航天器驻点热力分析的通式.然而在平衡假设条件下,尽管计算所得到的驻点热流密度与之前的CFD数值结果差别不大,但这种情况下计算得到的温度与试验数据不符,这应归结于计算的热流密度结果对驻点处温度变化的不敏感.比较非平衡假设和平衡假设下的换热计算结果表明,对于航天器再入过程中的热力探讨不能仅仅满足于热流密度分析,对温度的考察或许更重要.
Based on the flight test data and related CFD numerical simulation results of OREX (orbital reentry experiment vehicle), the heat transfer theory and related formulas were used to analyze the trajectory of OREX re-entry into the atmosphere and the heat flux imbalance at the stagnation point And the heat transfer under the assumption of equilibrium.The calculated stagnation temperature and heat flux density under the non-equilibrium heat flux calculation are in good agreement with the experimental data and the related CFD numerical results, and the corresponding calculation methods As a general formula for the thermal analysis of a spacecraft stationary site.However, under the equilibrium assumption, although the calculated stagnation heat flux density is not much different from the previous CFD numerical results, the calculated temperature in this case does not accord with the experimental data , Which should be attributed to the fact that the calculated heat flux density results are insensitive to the temperature change at the stagnation point.Comparing the results of the heat transfer calculation under the non-equilibrium assumption and the equilibrium assumption, we can find that the thermal discussion in the reentry process of the spacecraft can not only satisfy the heat flow Density analysis, the temperature of the investigation may be more important.