Skin-friction measurements in a turbulent boundary layer under the influence of free-stream turbulence

Skin-friction measurements in a turbulent boundary layer under the influence of free-stream turbulence
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自由流湍流影响下湍流边界层的表面摩擦测量

DOI:
10.1007/s00348-017-2397-8
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发表时间:
2017
影响因子:
2.4
通讯作者:
Esteban L
Esteban L
中科院分区:
工程技术3区
文献类型:
--
作者:
Esteban L

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本文研究了由主动网格产生的自由流湍流(FST)对零压力梯度湍流边界层表面摩擦的影响。壁面剪应力的测量采用油膜干涉法。此外,还利用热线风速仪获得了沿流速度的壁法向分布。这使得可以从平均轮廓中推导出表面摩擦力。对于每个测试用例,这两种方法都显示出惊人的一致性。虽然表面阻力随FST的增加而增加,但随雷诺数的变化趋势与未加FST的情况相似。此外,一旦考虑了摩擦速度的变化,对数区域及其以下的自相似(即壁面定律)似乎对所有所研究的FST情况都成立。
This experimental investigation deals with the influence of free-stream turbulence (FST) produced by an active grid on the skin friction of a zero-pressure-gradient turbulent boundary layer. Wall shear stress is obtained by oil-film interferometry. In addition, hot-wire anemometry was performed to obtain wall-normal profiles of streamwise velocity. This enables the skin friction to be deduced from the mean profile. Both methods show remarkable agreement for every test case. Although skin friction is shown to increase with FST, the trend with Reynolds number is found to be similar to cases without FST. Furthermore, once the change in the friction velocity is accounted for, the self-similarity of the logarithmic region and below (i.e. law of the wall) appears to hold for all FST cases investigated.
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