棱台式柔性外形气动力热环境仿真研究

文章利用修正后的计算流体动力学（CFD）模型，考虑变形影响，对比分析了可展开气动减速技术中3种典型气动外形的热流密度、气动压力和气动剪力分布规律。研究结果显示：传统回转体刚性外形的周向气动力热分布均匀，而棱台式外形在棱边处出现气动力热集中现象，且这种集中现象对于柔性外形更为明显；随着径向距离增加，3种外形的热流密度均逐步减小，而在过肩部处又陡然小幅上升；棱台式刚性外形与传统回转体刚性外形的气动压力分布规律一致，与棱台式柔性外形的气动剪力分布规律一致；棱台式刚性外形的气动力热特征整体上可以包络棱台式柔性外形的气动力热特征。

Simulation of aerodynamic force and heat flux distributions for prismatic flexible aeroshell

This paper compares and analyzes the distributions of the aerodynamic force and the heat flux for three kinds of aeroshells, by using a modified CFD model and taking into account the deformation effects. It is shown that the aerodynamic force and heat flux of the traditional rotary rigid aeroshell are in uniform distributions in the circumferential direction, while in the actual cases the aerodynamic force and heat concentrate at the edge of the prismatic aeroshell, especially for the prismatic flexible aeroshell. The heat flux for all kinds of aeroshells gradually decreases with the increase of the radial distance, with an abruptly rise at the shoulder edges. For the prismatic rigid aeroshell, a similar distribution of the aerodynamic pressure to that of the traditional rotary rigid aeroshell, and a similar distribution law of aerodynamic shear is found as that for the prismatic flexible aeroshell. In addition, the aerodynamic force and heat profiles for the prismatic rigid aeroshell can be the envelopes of those for the flexible counterpart.