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首页> 外文会议>AIAA Aerospace Sciences Meeting;AIAA SciTech Forum >Impact of Non-Tangent-Slab Radiative Transport on Flowfield-Radiation Coupling
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Impact of Non-Tangent-Slab Radiative Transport on Flowfield-Radiation Coupling

机译：非正切平板辐射传输对流场-辐射耦合的影响

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摘要

For coupled flowfield-radiation simulations, required for Earth entry at velocities greater than 10 km/s, tangent-slab radiative transport is shown to sufficiently model the divergence of the radiative flux (this term couples the radiative energy to the flowfield energy equations). However, as shown in previous studies, the tangent-slab approximation does not sufficiently model the radiative flux reaching the surface (i.e., the radiative heating). These conclusions are reached through the development of a detailed ray-tracing approach capable of computing both the divergence of the radiative flux and the radiative heating. This approach is orders-of-magnitude more computationally expensive than the tangent-slab approximation. The ability of the tangent-slab approach to accurately model the divergence of the radiative flux, but not the radiative heating, is shown to be the result of a cancelation of errors during the angular integration. The current work shows that combining the tangent-slab approximation for the divergence of the radiative flux with the ray-tracing approach for the radiative heating (as a post-processing step) provides sufficiently accurate results, in an efficient manner, for coupled flowfield-radiation problems.
机译：对于以大于10 km / s的速度进入地球所需的耦合流场辐射模拟，已显示出切线平板辐射传输足以模拟辐射通量的发散（该术语将辐射能耦合到流场能量方程）。但是，如先前的研究所示，切线板近似不能充分地模拟到达表面的辐射通量（即辐射加热）。通过开发能够计算辐射通量和辐射热发散的详细射线追踪方法，可以得出这些结论。这种方法的计算量级要比切线平板近似值高出几个数量级。切线平板方法能够准确地模拟辐射通量的发散而不是辐射加热的能力，这是由于角度积分过程中的误差消除而产生的。当前的工作表明，将辐射通量的发散的切线近似值与辐射加热的射线追踪方法（作为后处理步骤）相结合，可以有效地为耦合流场提供足够准确的结果，辐射问题。

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