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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effect of the wall temperature on Mach stem transformation in pseudo-steady shock wave reflections
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Effect of the wall temperature on Mach stem transformation in pseudo-steady shock wave reflections

机译：壁温对拟稳态冲击波反射中马赫杆变形的影响

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Pseudo-steady shock wave reflections on a compression ramp are recognized as a significant phenomenon in the shock dynamics field. Several investigations have been performed on this phenomenon by shock tube experiments, combined with numerical and theoretical analyses. In addition to the availability of numerous reliable and accurate data on shock reflection patterns in the form of regular reflection, double-Mach reflection, transitional-Mach reflection, and single-Mach reflection, several transitional criteria such as detachment criterion and mechanical-equilibrium criterion are also established. However, none of the research focuses on the influence of the wall temperature on Mach stem transformation in pseudo-steady shock wave reflections. In order to articulate the role played by the wall temperature, a two-dimensional numerical simulation is performed by resolving the unsteady Reynolds-averaged Navier-Stokes equations to investigate the transformation of the Mach stem. Shear-stress transport K-ω turbulence model and third-order Monotonic Upwind Scheme for Conservation Laws scheme are explored to accurately capture various shock structures. Numerical results are initially validated with experimental data in the open literature and it is evident that there is an excellent match between the present simulation and the actual structure. Subsequently, the grid resolution and time step independence analyses are considered to better resolve the shock reflection configuration. Large-scale negative and positive heat fluxes are imposed on the ramp wall, which can simulate the cooling and heating ramps respectively. A new Mach stem transformation that illustrates significant differences in physical structure evolutions caused by the variation of the wall temperature is numerically captured for the first time. The mechanism of wall temperature effects on the transformation of the Mach stem is clearly expounded with the purpose of profound understanding for pseudo-steady shock wave reflections.
机译：压缩斜坡上的伪稳态冲击波反射被认为是冲击动力学领域中的重要现象。通过冲击管实验，结合数值和理论分析，已经对该现象进行了一些研究。除了可以以常规反射，双马赫反射，过渡马赫反射和单马赫反射的形式获得大量关于冲击反射模式的可靠且准确的数据外，还可以使用多种过渡标准，例如脱离标准和机械平衡标准。也建立了。但是，没有研究集中在伪稳态冲击波反射中壁温对马赫杆变形的影响。为了清楚说明壁温所起的作用，通过求解非稳态的雷诺平均Navier-Stokes方程进行二维数值模拟，以研究马赫杆的变形。探索了剪切应力输运K-ω湍流模型和三阶单调守恒律迎风方案，以精确捕获各种激波结构。数值结果最初使用公开文献中的实验数据进行了验证，很明显，当前的模拟与实际结构之间存在很好的匹配。随后，考虑了网格分辨率和时间步长独立性分析，以更好地解决冲击反射构造。大型负热通量施加在坡道壁上，可以分别模拟冷却和加热坡道。首次以数字方式捕获了新的马赫杆变换，该变换说明了壁温变化引起的物理结构演变的显着差异。为了深入理解伪稳态冲击波反射，明确阐明了壁温对马赫杆变形的影响机理。

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