The analysis of the risk from re-entry objects has become an important topic. Concerning the uncertainties and different flow regimes, the object-oriented tools have been developed and used for various re-entry mission scenarios because of the simplified computation process and low calculation burden, which allow a probabilistic analysis. In this study, the heat flux correlations that are used in the object-oriented tools are investigated and compared to better understand the heat flux predictions with respect to re-entry survivability. Often these tools calculate the continuum stagnation-point heat flux using the correlation formulae of Lees and Fay–Riddell, which usually assume local thermo-chemical equilibrium with a fully-catalytic wall condition in the shock layer. Based on this observation, heat flux measurements were conducted in a hypersonic wind tunnel, and validated with the theory of Fay–Riddell considering the equivalent velocity gradient. For the comparison, in total, 11 different heat flux correlations were examined. It is shown that, based on the formula of Fay–Riddell, the differences in the final integrated heat flux were less than 16% which led to a large discrepancy in the survivability estimations for the cases of small spheres made of aluminum. This shows the importance of considering the heat flux correlation as well as the velocity gradient effect for such re-entry analysis.

再入物体的风险分析已成为一个重要的课题。针对不确定性和不同的流态，面向对象的工具已经被开发并用于各种再入任务场景，因为它简化了计算过程，计算负担低，可以进行概率分析。在这项研究中，研究并比较了面向对象工具中使用的热通量相​​关性，以更好地了解关于再入生存性的热通量预测。通常，这些工具使用 Lees 和 Fay-Riddell 的相关公式计算连续滞点热通量，这些公式通常假设局部热化学平衡与激波层中的完全催化壁条件。基于这一观察，热通量测量在高超声速风洞中进行，并在考虑等效速度梯度的情况下使用 Fay-Riddell 理论进行验证。为了进行比较，总共检查了 11 种不同的热通量相​​关性。结果表明，根据 Fay-Riddell 公式，最终综合热通量的差异小于 16%，这导致铝制成的小球体情况下的生存率估计存在较大差异。这表明考虑热通量相关性以及此类再入分析的速度梯度效应的重要性。最终积分热通量的差异小于 16%，这导致铝制成的小球体情况下的生存能力估计存在很大差异。这表明考虑热通量相关性以及此类再入分析的速度梯度效应的重要性。最终综合热通量的差异小于 16%，这导致铝制成的小球体情况下的生存能力估计存在很大差异。这表明考虑热通量相关性以及此类再入分析的速度梯度效应的重要性。