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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Examination of uniform momentum zones in hypersonic turbulent boundary layers

机译:APS-流体动力学APS部门第70届年会-事件-高超声速湍流边界层中均匀动量区域的检查

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The presence of uniform momentum zones (UMZs) separated by regions of high shear is now well-established in incompressible flows, with the mean number of such zones increasing in a log-linear fashion with Reynolds number. While known to be present in supersonic and hypersonic boundary layers, the properties of these UMZs and the appropriate Reynolds number for comparison with incompressible results have not previously been investigated. A large, previously published DNS database of hypersonic boundary layers is used in this investigation, with Mach numbers up to 12 and wall temperatures from cold to adiabatic, resulting in a wide range of outer layer Reynolds numbers. UMZs are examined using a range of parameters in both conventional inner and semi-local scalings, and Reynolds number trends examined.
机译:现在,在不可压缩的流动中已经很好地确定了由高剪切区域分隔的均匀动量区域(UMZ)的存在,这些区域的平均数量以雷诺数的对数线性方式增加。尽管已知在超音速和高超音速边界层中存在这些UMZ的特性以及用于与不可压缩结果进行比较的适当雷诺数,但之前尚未进行过研究。在这项研究中,使用了一个大型的,先前发布的高超声速边界层的DNS数据库,其马赫数高达12,壁温从冷到绝热,因此产生了广泛的外层雷诺数。使用常规内部和半局部缩放中的一系列参数来检查UMZ,并检查雷诺数趋势。

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