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Heat Transfer and Boundary-Layer Stability Analysis of Subscale BOLT and the Fin Cone

机译：次尺度BOLT和翅片锥的传热及边界层稳定性分析

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This paper analyzes two different hypersonic geometries: a subscale model of the BOLT geometry, and a modular fin cone. Each of these geometries presents its own challenges in creating laminar basic states. The subscale BOLT geometry possesses spanwise body curvature as well as a highly swept leading edge, and the fin cone has interacting shocks and a set of vortices. On the subscale BOLT geometry, heat flux at the wall is examined and compared to DNS as well as experiments. In addition, the linear parabolized stability equations are used to probe the flow for relevant instabilities. The 2nd mode, stationary crossflow, and traveling crossflow are all found to be present on the top surface of BOLT. The 2nd mode does not reach high levels of amplification, but both of the crossflow instabilities reach meaningful levels of amplification. A detailed heat flux examination is undertaken on the fin cone across a range of basic states that each vary a different aspect of this modular geometry. In each case, both a large portion of the cone surface as well as the fin itself are examined from a heat flux point of view. Looking at the different geometric variations, a number of heating trends are uncovered. Some trends vary linearly between each case and other trends behave very differently between each case. Finally, as a result of these investigations, several additional points are discussed that warrant future examinations of their own.
机译：本文分析了两种不同的高超音速几何形状：BOLT几何形状的子尺度模型和模块化翅片锥体。这些几何形状中的每一个在创建层状基本状态时都面临着自己的挑战。次刻度的BOLT几何形状具有翼展方向的身体曲率以及高度扫掠的前缘，并且鳍锥具有相互作用的冲击和一组涡旋。在BOLT几何尺寸以下，检查壁的热通量，并将其与DNS以及实验进行比较。此外，线性抛物线稳定性方程用于探测流量的相关不稳定性。发现第二模式，固定错流和行进错流都存在于螺栓的顶表面上。第二模式没有达到高水平的放大，但是两种错流不稳定性都达到了有意义的放大水平。在翅片锥体上，通过一系列基本状态进行详细的热通量检查，每种基本状态都会改变此模块化几何结构的不同方面。在每种情况下，从热通量的角度检查锥体表面的大部分以及鳍片本身。观察不同的几何变化，发现了许多加热趋势。在每种情况下，某些趋势线性变化，而在其他情况下，其他趋势则表现出很大差异。最后，作为这些调查的结果，讨论了另外一些要点，这些要点有待日后进行检查。

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