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首页> 外文期刊>Journal of Spacecraft and Rockets >Radiative Heating Uncertainty for Hyperbolic Earth Entry, Part 1:Flight Simulation Modeling and Uncertainty
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Radiative Heating Uncertainty for Hyperbolic Earth Entry, Part 1:Flight Simulation Modeling and Uncertainty

机译：双曲线地球进入的辐射加热不确定度，第1部分：飞行模拟和不确定度

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This paper investigates the shock-layer radiative heating uncertainty for hyperbolic Earth entry, with the main focus being a Mars return. A baseline simulation approach involving the Laura Navier-Stokes code with coupled ablation and radiation is presented, with the Hara radiation code being used for the radiation predictions. Flight cases representative of peak heating Mars or asteroid return are denned, and the strong influence of coupled ablation and radiation on their aerothermodynamic environments are shown. Structural uncertainties inherent in the baseline simulations are identified, with turbulence modeling, precursor absorption, grid convergence, and radiation transport uncertainties combining for a +34 and —24% structural uncertainty on the radiative heating. A parametric uncertainty analysis, which assumes interval uncertainties, is presented. This analysis accounts for uncertainties in the radiation models, as well as heat of formation uncertainties in the flowfield model. Discussions and references are provided to support the uncertainty range chosen for each parameter. A parametric uncertainty of +47 and —28% is computed for the stagnation-point radiative heating for the 15 km/s Mars-return case. A breakdown of the largest individual uncertainty contributors is presented, which includes C_3 Swings cross section, photoionization edge shift, and Opacity Project atomic lines. Combining the structural and parametric uncertainty components results in a total uncertainty of +81 and -52% for the Mars-return case.
机译：本文研究了双曲线地球进入的激波层辐射加热的不确定性，重点是火星返回。提出了一种基线仿真方法，该方法涉及劳拉Navier-Stokes码以及消融和辐射耦合，并将Hara辐射码用于辐射预测。确定了代表火星或小行星返回峰值加热的飞行情况，并显示了消融和辐射耦合对其空气热动力环境的强烈影响。通过湍流建模，前驱体吸收，网格收敛和辐射输运不确定性，将基线模拟中固有的结构不确定性确定为辐射加热的+ 34％和-24％的结构不确定性。提出了假设不确定性的参数不确定性分析。该分析考虑了辐射模型中的不确定性以及流场模型中地层热量的不确定性。提供讨论和参考以支持为每个参数选择的不确定性范围。对于15 km / s的火星返回情况，停滞点辐射加热的参数不确定度为+47和-28％。给出了最大的不确定因素的分解，其中包括C_3 Swings横截面，光电离边缘偏移和不透明性项目原子线。结合结构和参数不确定性成分，火星返回情况的总不确定性为+81和-52％。

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