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Interfaces and internal layers in a turbulent boundary layer

机译：湍流边界层中的界面和内部层

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摘要

New experimental research is presented on the characteristics of interfaces and internal shear layers that are present in a turbulent boundary layer (TBL). The turbulenton-turbulent (T/NT) interface at the outer boundary of the TBL shows the presence of a finite jump in streamwise velocity and is characterised by a thin shear layer. It appears that similar layers of high shear occur also within the TBL which separate regions of almost uniform momentum. It turns out that they exhibit similar characteristics as the external T/NT interface. Furthermore, the spatial growth rate of the TBL, that is derived from theoretical analysis, can be correctly predicted from a momentum balance near the external T/NT interface. Similarly, the entrainment velocities for the average internal layers have been determined. Results indicate that internal layers move slower in the vicinity of the wall, whereas they move faster than the large scale boundary layer growth rate in the outer region of the TBL. It is believed that shear layers bound large scale flow regions of approximately uniform momentum. Hence, the entrainment velocities of these internal layers may be interpreted as growth rates of the large scale motions in a TBL. (C) 2015 AIP Publishing LLC.
机译：提出了关于湍流边界层（TBL）中存在的界面和内部剪切层特征的新实验研究。 TBL外边界处的湍流/非湍流（T / NT）界面显示出在流向速度中存在有限的跳跃，并以薄剪切层为特征。似乎在TBL内也出现了类似的高剪切层，它们将动量几乎相同的区域分开。事实证明，它们表现出与外部T / NT接口类似的特性。此外，可以从外部T / NT界面附近的动量平衡正确地预测从理论分析得出的TBL的空间增长率。类似地，已经确定了平均内层的夹带速度。结果表明，内层在壁附近的移动速度较慢，而它们的移动速度比TBL外部区域中大规模边界层的生长速度快。可以相信，剪切层限制了大约均匀动量的大规模流动区域。因此，这些内部层的夹带速度可以解释为TBL中大规模运动的增长率。 （C）2015 AIP Publishing LLC。

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