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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Anisotropy measurements in the boundary layer over a flat plate with suction
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Anisotropy measurements in the boundary layer over a flat plate with suction

机译：用吸力测量平板边界层上的各向异性

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Laser Doppler velocity measurements are carried out in a turbulent boundary layer subjected to concentrated wall suction (through a porous strip). The measurements are taken over a longitudinal distance of 9 x the incoming boundary layer thickness ahead of the suction strip. The mean and rms velocity profiles are affected substantially by suction. Two-point measurements show that the streamwise and wall-normal autocorrelations of the streamwise velocity are reduced by suction. It is found that suction alters the redistribution of the turbulent kinetic energy k between its components. Relative to the no-suction case, the longitudinal Reynolds stress contributes more to k than the other two normal Reynolds stresses; in the outer region, its contribution is reduced which suggests structural changes in the boundary layer. This is observed in the anisotropy of the Reynolds stresses, which depart from the non-disturbed boundary layer. With suction, the anisotropy level in the near-wall region appears to be stronger than that of the undisturbed layer. It is argued that the mean shear induced by suction on the flow is responsible for the alteration of the anisotropy. The variation of the anisotropy of the layer will make the development of a turbulence model quite difficult for the flow behind suction. In that respect, a turbulence model will need to reproduce well the effects of suction on the boundary layer, if the model is to capture the effect of suction on the anisotropy of the Reynolds stresses. (C) 2009 Elsevier Inc. All rights reserved.
机译：激光多普勒速度测量在湍流边界层中进行，该边界层受到集中壁吸力（通过多孔带）。在吸条前面的9倍于进入边界层厚度的纵向距离上进行测量。平均速度和均方根速度曲线基本上受吸力影响。两点测量结果表明，吸力降低了水流速度的水流自相关和壁法向自相关。发现吸力改变了湍流动能k在其各分量之间的重新分布。相对于无吸力情况，纵向雷诺应力对k的贡献要大于其他两个法向雷诺应力。在外部区域，其贡献减小，这表明边界层的结构发生了变化。在雷诺应力的各向异性中可以观察到这一点，该各向异性偏离了未扰动的边界层。通过吸力，近壁区域的各向异性水平似乎强于未扰动层的各向异性水平。有人认为，由吸力引起的平均剪切力是造成各向异性变化的原因。层的各向异性的变化将使吸力后面的流动很难建立湍流模型。在这方面，如果湍流模型是要捕捉吸力对雷诺应力各向异性的影响，那么湍流模型将需要很好地再现吸力对边界层的影响。 （C）2009 Elsevier Inc.保留所有权利。

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