Aerothermodynamic comparison of two- and three-dimensional rarefied hypersonic cavity flows
Aerothermodynamic comparison of two- and three-dimensional rarefied hypersonic cavity flows
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DOI：
10.2514/1.a32746
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发表时间：
2014-10
影响因子：
1.6
通讯作者：
R. Palharini;T. Scanlon;J. Reese
中科院分区：
文献类型：
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作者：
R. Palharini;T. Scanlon;J. Reese
热防护系统是航天飞行器再入大气层任务的关键部件。通常，在热载荷计算中，分析假设车辆表面光滑。然而，由于制造公差、传感器安装、热保护板之间的空间以及不同材料之间的膨胀或烧蚀率差异，航空航天飞行器表面经常存在不连续或缺陷。在本工作中，对地球大气中80千米高度的二维和三维空腔的稀薄高超声速流动进行了数值研究。在过渡状态下，对Navier-Stokes方程的有效性有疑问的流动进行建模，使用了直接模拟蒙特卡罗方法。主要目标是评估由不同长深比定义的二维和三维腔的传热，压力和皮肤摩擦系数的敏感性。分析是……
The thermal protection system is a key element in atmospheric re-entry missions of aerospace vehicles. Usually, in the thermal load calculations, the analysis assumes that the vehicle has a smooth surface. However, discontinuities or imperfections are often present on the aerospace vehicle surfaces due to fabrication tolerances, sensor installations, spaces between the thermal protection plates, and differential expansion or ablation rates between non-similar materials. In the present work, rarefied hypersonic flows over two- and three-dimensional cavities at an altitude of 80 km in the Earth’s atmosphere are studied numerically. To model flows in the transitional regime, where the validity of the Navier–Stokes equations is questionable, the direct simulation Monte Carlo method has been used. The primary goal is to assess the sensitivity of heat transfer, pressure, and skin-friction coefficients for a family of two- and three-dimensional cavities defined by different length-to-depth ratios. The analysis s...