The spanwise non-uniformity of nominally two-dimensional turbulent boundary layer : 2nd Report Wall shear stress and flow field
The spanwise non-uniformity of nominally two-dimensional turbulent boundary layer : 2nd Report Wall shear stress and flow field
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标称二维湍流边界层的翼展方向不均匀性：第二报告壁剪切应力和流场
DOI：
10.1299/jsme1958.18.673
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
H. Honda
中科院分区：
文献类型：
--
作者：
Y. Furuya;I. Nakamura;H. Osaka;H. Honda
在某些情况下，即使从实际观点看外部条件是充分二维的，紊流边界层中的速度分布也显示出明显的展向不均匀性。在前一篇文章中，作者从两种平板上流向速度、湍流边界层湍流强度和壁面剪应力的空间分布的实验结果中，详细地描述了展向非均匀性的特征。本文通过对湍流边界层中流向的测量，研究了流向涡的尺度和产生机理。制作了一个浮动单元式装置，并利用该装置测量了局部壁面剪应力。并与Clauser图和普雷斯顿管法等方法的结果进行了比较。从结果可以推断，即使在这种情况下，平均速度的空间变化非常大，壁面剪应力的平均值也可以由二维方程表示。利用这些实验结果阐明了这种湍流边界层空间变化的机制。
In some cases the velocity distribution in a turbulent boundary layer shows remarkable spanwise non-uniformity even though the outer condition is is sufficiently two-dimensional from a practical point of view. In the previous paper, the authors described the characteristics of the spanwise non-uniformity in detail, from the experimental results of the spatial distributions of the streamwise velocity, turbulent intensity in the turbulent boundary layer and wall shear stress on two types of flat plates. In this report, the scale and mechanism of the streamwise vortices are investigated by the measurements of the flow direction in the turbulent boundary layer. A floating element type device is made and the local wall shear stress is measured by this apparatus. The values of wall shear stress obtained by this method are compared with the values obtained by other methods such as Clauser chart and the Preston tube method. From the result, it is inferred that the mean value of wall shear stress can be expressed by a two-dimensional equation even though the spatial variations of the mean velocity are remarkably large as in this case. The mechanism of the spatial variation of this turbulent boundary layer is clarified by using these experimental results.