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首页> 外文期刊>Physics of fluids >On the unsteadiness of shock-laminar boundary layer interactions of hypersonic flows over a double cone
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On the unsteadiness of shock-laminar boundary layer interactions of hypersonic flows over a double cone

机译：关于双锥体超声波流量的抗冲击层边界层相互作用的不稳定

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Unsteadiness of axisymmetric shock-dominated hypersonic laminar separated flow over a double cone is studied for the first time using a combination of time accurate Direct Simulation Monte Carlo (DSMC) calculations, linear global instability analysis, and momentum potential theory (MPT). Close to steady state linear analysis reveals the spatial structure of the underlying temporally stable global modes. At all Reynolds numbers examined, the amplitude functions demonstrate the strong coupling between the separated flowregion at the cone junction with the entire shock system, including pressure and temperature waves generated behind the shock and spatially amplified Kelvin-Helmholtz waves. In addition, as the Reynolds number is increased, temporally damped harmonic shock oscillations and multiple-reflected lambda-shock patterns emerge in the eigenfunctions. Application of the MPT (valid for both linear and nonlinear signals) to the highest Reynolds number DSMC results shows that large acoustic and thermal potential variations exist in the vicinity of the separation shock, the lambda-shock patterns, and the shear layers. It is further shown that the motion of the bow shock system is highly affected by non-uniformities in the acoustic field. At the highest Reynolds number considered here, the unsteadiness is characterized by Strouhal numbers in the shear layer and bow-shock regions and is found to be in qualitative agreement with earlier experimental and numerical work. Published by AIP Publishing.
机译：忽快忽慢轴对称震荡为主的超音速层的分离使用的时间相结合精确的直接模拟蒙特卡洛（DSMC）计算流过双锥体进行了研究，第一次，线性全球不稳定的分析和动量位势理论（MPT）。接近稳态线性分析揭示标的时间上稳定的全局模式的空间结构。在所有雷诺数检查，振幅函数证明所分离的flowregion之间的强耦合在与整个冲击系统，包括压力和冲击后方产生温度波和空间扩增开尔文 - 亥姆霍兹波锥体交界处。另外，作为雷诺数增加时，在时间上衰减高次谐波震荡振荡和多重反射的λ激型态在本征函数出现。在MPT的应用（有效线性和非线性的信号）到最高雷诺数DSMC结果表明，在分离冲击，拉姆达冲击图案的附近存在大的声和热势变化，并且剪切层。它进一步表明，弓防震系统的运动被高度受到在声场非均匀性。在这里考虑的最高雷诺数，忽快忽慢在剪切层和弓激波区特点斯特劳哈尔数和被发现在早期的实验和数值计算定性一致。通过AIP发布发布。

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