Modification of the large-scale features of high Reynolds number wall turbulence by passive surface obtrusions
Modification of the large-scale features of high Reynolds number wall turbulence by passive surface obtrusions
复制标题
通过被动表面遮挡来修改高雷诺数壁湍流的大尺度特征
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. S. Chong
中科院分区：
文献类型：
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作者：
J. Monty;J. Allen;K. Lien;M. S. Chong
新墨西哥州立大学的高雷诺数边界层风洞设施配备了规则分布的盲文表面。该表面的盲文点在流向方向上紧密排列，而在翼展方向上间隔稀疏。这种新颖的表面对流动产生了意想不到的影响：壁湍流的超大规模特征（长度约为边界层厚度的六倍）的能量显着减弱，甚至进入对数区域。据作者所知，这是第一个报告粗壁湍流边界层中“上部结构”修改的实验研究。结果产生了这样的可能性：在高雷诺数下通过非常小的被动表面粗糙度进行流量控制是可能的，而不会出现迄今为止预期的令人望而却步的阻力损失。还发现了在粗糙度元素之间的展向空间中不受抑制地存在近壁循环的证据，这是光滑壁湍流研究人员所熟知的。
A high Reynolds number boundary-layer wind-tunnel facility at New Mexico State University was fitted with a regularly distributed braille surface. The surface was such that braille dots were closely packed in the streamwise direction and sparsely spaced in the spanwise direction. This novel surface had an unexpected influence on the flow: the energy of the very large-scale features of wall turbulence (approximately six-times the boundary-layer thickness in length) became significantly attenuated, even into the logarithmic region. To the author’s knowledge, this is the first experimental study to report a modification of ‘superstructures’ in a rough-wall turbulent boundary layer. The result gives rise to the possibility that flow control through very small, passive surface roughness may be possible at high Reynolds numbers, without the prohibitive drag penalty anticipated heretofore. Evidence was also found for the uninhibited existence of the near-wall cycle, well known to smooth-wall-turbulence researchers, in the spanwise space between roughness elements.
影响因子：
2.4
作者：
M. Amir;I. Castro
通讯作者：
M. Amir;I. Castro
影响因子：
3.7
作者：
I. Castro
通讯作者：
I. Castro