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首页> 外文期刊>Journal of Propulsion and Power >Simulation of Shock/Boundary-Layer Interactions with Bleed Using Immersed-Boundary Methods
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Simulation of Shock/Boundary-Layer Interactions with Bleed Using Immersed-Boundary Methods

机译：使用浸入边界方法模拟渗流与冲击/边界层的相互作用

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This work uses an immersed-boundary method to simulate the effects of arrays of discrete bleed holes inncontrolling shock-wave/turbulent-boundary-layer interactions. Both Reynolds-averaged Navier–Stokes and hybridnlarge-eddy/Reynolds-averaged Navier–Stokes turbulence closures are used with the immersed-boundary technique.nThe approach is validated by conducting simulations of Mach 2.5 flow over a perforated plate containing 18nindividual bleed holes. Computed values of discharge coefficient as a function of bleed plenum pressure arencompared to experimental data. Simulations of an impinging-oblique-shock/boundary-layer interaction at Machn2.45 with and without bleed control are also performed. For the studies with bleed, two different bleed rates arenemployed. The 68 hole bleed plate is rendered as an immersed object in the computational domain. Wall pressurenpredictions show that, in general, the large-eddy/Reynolds-averaged Navier–Stokes technique underestimates thenupstream extent of axial separation that occurs in the absence of bleed. Good agreement with pitot pressure surveysnthroughout the interaction region is obtained, however. Flow control at the maximum-bleed rate completely removesnthe separation region and induces local disturbances in the wall pressure distributions that are associated with thenexpansion of the boundary-layer fluid into the bleed port and its subsequent recompression. Computed pitot pressurendistributions are in good agreement with experiment for the cases with bleed. Swirl-strength probability densityndistributions are used to estimate the evolution of turbulent length scales throughout the interaction. These, alongnwith Reynolds-stress predictions, indicate that an effect of strong bleed rates is to accelerate the recovery of thenboundary layer toward a new equilibrium state downstream of the interaction region.
机译：这项工作使用沉浸边界方法来模拟离散泄放孔阵列在控制冲击波/湍流-边界层相互作用中的作用。雷诺平均的Navier-Stokes和混合大涡/雷诺平均的Navier-Stokes湍流闭塞都与沉浸边界技术一起使用。该方法通过对包含18个单个排泄孔的多孔板进行2.5马赫数流动的仿真得到了验证。排放系数作为放气压力的函数的计算值与实验数据相比没有。还进行了在有和没有出血控制的情况下，在Machn2.45上的撞击斜向冲击/边界层相互作用的仿真。对于有出血的研究，采用两种不同的出血率。 68孔放气板在计算域中被渲染为沉浸对象。壁面压力的预测表明，通常，大涡/雷诺平均Navier-Stokes技术低估了在没有渗漏的情况下轴向分离的上游程度。但是，在整个相互作用区域内皮托管压力测量都获得了很好的一致性。以最大排放速率进行流量控制会完全去除分离区域，并在壁压力分布中引起局部扰动，这些扰动与随后边界层流体膨胀进入排放口及其随后的再压缩有关。对于出血病例，计算的皮托管压力分布与实验吻合良好。旋流强度概率密度n分布用于估计整个相互作用过程中湍流尺度的演变。这些以及雷诺应力预测表明，强渗出率的作用是促进边界层向相互作用区域下游的新平衡态加速恢复。

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