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首页> 外文会议>In: AIAA, Applied Aerodynamics Conference, 16th, Albuquerque, NM, June 15-18, 1998, Technical Papers (A98-32401 08-02), Reston, VA, American Institute of Aeronautics and Astronautics, 1998 >Investigation of unsteady behavior of separated flow in the boattail region of bulbous payload shroud
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Investigation of unsteady behavior of separated flow in the boattail region of bulbous payload shroud

机译：球形有效载荷围带尾部区域内分离流的非稳态行为研究

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The unsteady, compressible Reynolds-averaged Navier-Stokes equations are solved for a flow past a bulbous payload shroud at zero incidence. ^For a freestream Mach number of 0.95 and a Reynolds number of 16.40 x 10 exp 6/m, a time-dependent computation is performed using a finite-volume technique in conjunction with a multistage Runge-Kutta time-stepping scheme. ^Closure of these equations is achieved using the Baldwin-Lomax turbulence model. ^Comparisons are made with experimental results, such as schlieren pictures, position of terminal shock on forebody cylinder, and surface pressure distribution. ^They are found to be in good agreement. ^A separated flow on the boattail region is observed to be highly unsteady. ^The objective of this numerical simulation is to determine the characteristics of the fluctuating surface pressure distribution. ^Standard deviations, higher-order moments, histograms, and spectrum of pressure and sound pressure level of pressure fluctuations are analyzed in the separated region of the boattail. ^(Author)
机译：对于以零入射角通过球状有效载荷导流罩的流动，求解了不稳定的，可压缩的雷诺平均Navier-Stokes方程。 ^对于0.95的自由马赫数和16.40 x 10 exp 6 / m的雷诺数，使用有限体积技术结合多级Runge-Kutta时间步长方案进行与时间有关的计算。 ^使用Baldwin-Lomax湍流模型可以封闭这些方程式。 ^与实验结果进行比较，例如schlieren图片，前身圆柱体上的末端冲击位置以及表面压力分布。 ^他们被认为是非常一致的。 ^观察到船尾区域的分离流动非常不稳定。 ^此数值模拟的目的是确定波动的表面压力分布的特征。 ^在船尾的分离区域中分析了标准偏差，高阶矩，直方图和压力谱以及压力波动的声压级。 ^（作者）

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