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首页> 外文期刊>Flow, turbulence and combustion >Experimental Investigation of the Log-Law for an Adverse Pressure Gradient Turbulent Boundary Layer Flow at Re_θ = 10000
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Experimental Investigation of the Log-Law for an Adverse Pressure Gradient Turbulent Boundary Layer Flow at Re_θ = 10000

机译：Re_θ= 10000的逆压力梯度湍流边界层流的对数律的实验研究

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摘要

We present an experimental investigation of a turbulent boundary layer flow at a significant adverse pressure gradient at Reynolds number Re_θ = 10000 using large field PIV. The testcase is designed to start from a zero pressure gradient flow at Re_θ = 8000 with a distinct log-law region following a slowly rising adverse pressure gradient. This allows to reveal a breakdown of the log-law under the effect of the adverse pressure gradient. The region described by the log-law is progressively reduced in terms of y~+ and then joins into a modified log-law which gives a good fit to the data up to at least y/δ_(99) ≈ 0.2. The scaling in the overlap region is demonstrated using the mean velocity slope diagnostic function, enabled due to the high quality of the PIV data. Locally, the velocity profile is measured down to the wall using long- rangemicroscopic PIV with particle tracking velocimetry to determine the wall shear stress directly in the adverse pressure gradient region.
机译：我们目前使用大视野PIV在雷诺数Re_θ= 10000的显着不利压力梯度下对湍流边界层流动进行实验研究。测试用例设计为从Re_θ= 8000处的零压力梯度流开始，在缓慢上升的不利压力梯度之后具有明显的对数律区域。这允许揭示在不利压力梯度的作用下对数定律的分解。对数定律描述的区域在y〜+上逐渐减小，然后加入修改的对数定律，该定律对数据的拟合度至少为y /δ_（99）≈0.2。由于PIV数据的高质量，使用平均速度斜率诊断功能演示了重叠区域的缩放。在局部，使用带有粒子跟踪测速仪的远程显微PIV可以测量到壁的速度分布，从而直接确定逆压梯度区域中的壁切应力。

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