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首页> 外文期刊>Physics of fluids >Investigation of unsteady, hypersonic, laminar separated flows over a double cone geometry using a kinetic approach
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Investigation of unsteady, hypersonic, laminar separated flows over a double cone geometry using a kinetic approach

机译：使用动力学方法对不稳定，高度，层状流动的流动流过双锥几何流动

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Shock-dominated hypersonic laminar flows over a double cone are investigated using time accurate direct simulation Monte Carlo combined with the residuals algorithm for unit Reynolds numbers gradually increasing from 9.35 x 104 to 3.74 x 10(5) m(-1) at a Mach number of about 16. The main flow features, such as the strong bow-shock, location of the separation shock, the triple point, and the entire laminar separated region, show a time-dependent behavior. Although the separation shock angle is found to be similar for all Re numbers, the effects of Reynolds number on the structure and extent of the separation region are profound. As the Reynolds number is increased, larger pressure values in the under-expanded jet region due to strong shock interactions form more prominent lambda-shocklets in the supersonic region between two contact surfaces. Likewise, the surface parameters, especially on the second cone surface, show a strong dependence on the Reynolds number, with skin friction, pressure, and surface heating rates increasing and velocity slip and temperature jump values decreasing for increasing Re number. A Kelvin-Helmholtz instability arising at the shear layer results in an unsteady flow for the highest Reynolds number. These findings suggest that consideration of experimental measurement times is important when it comes to determining the steady state surface parameters even for a relatively simple double cone geometry at moderately large Reynolds numbers. Published by AIP Publishing.
机译：使用时间准确的直接模拟蒙特卡罗对单位雷诺数的残留算法进行了逐步调整的冲击主导的高超声波流量，以便在马赫数以9.35×104至3.74 x 10（5）m（-1）逐渐增加大约16。主流特征，例如强弓震，分离冲击的位置，三重点和整个层状分离区域，显示出时间依赖的行为。尽管发现分离冲击角对于所有RE编号类似，但是雷诺数对分离区域的结构和范围的影响是深切的。随着雷诺数的增加，由于强冲击相互作用的强烈的冲击相互作用，下膨胀射流区域中的较大压力值在两个接触表面之间的超音区中形成更突出的λ-震动。同样地，表面参数，尤其是在第二锥形表面上，显示出对雷诺数的强依赖性，具有皮肤摩擦，压力和表面加热速率，增加和速度滑动和温度跳跃值随着增加的重量而降低。在剪切层产生的Kelvin-Helmholtz不稳定性导致最高雷诺数的不稳定流。这些研究结果表明，在确定稳态表面参数的情况下，考虑实验测量时间也很重要，即使在中等大的雷诺数的相对简单的双锥形几何形状中也是如此。通过AIP发布发布。

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