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Characteristics of Turbulent Linear Shear Flow and the Effect of Velocity Gradient on the Flow around a Circular Cylinder

机译：湍流线性剪切流动特性及速度梯度对圆柱绕流的影响

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The experimental study described in this paper are designed to clarify the characteristics of turbulent linear shear flow and the effect of velocity gradient on the flow around a circular cylinder in the cross flow with four various velocity gradients at Reynolds numbers in the range of 2.67x10^3 to 1.07x10^4. A nearly two-dimensional turbulent linear shear flow is generated in the test-section of a wind tunnel by inserting a grid of parallel rods with various spacing. The grid design is based on the analysis by Owen-Zienkiewicz. In the ordinary turbulent flow Reynolds stress keeps nearly constant or decreases slightly with the distance from the grid. On the other hand in the turbulent shear flow that keeps almost constant or increases slightly. The increment becomes larger with the velocity gradient. The turbulence intensity, velocity gradient and the integral scale which characterizes the size of a eddy increase with Reynolds stress. Therefore Reynolds stress appears to play a
机译：本文所述的实验研究旨在阐明湍流线性剪切流的特性以及速度梯度对横流中圆柱流的影响，在雷诺数为2.67x10 ^的范围内有四个不同的速度梯度3至1.07x10 ^ 4。通过插入具有不同间距的平行杆网格，在风洞的测试区域中产生近乎二维的湍流线性剪切流。网格设计基于Owen-Zienkiewicz的分析。在普通的湍流中，雷诺应力几乎保持恒定，或者随着距网格的距离而略有减小。另一方面，在湍流中，剪切流几乎保持恒定或略有增加。增量随着速度梯度变大。湍流强度，速度梯度和积分尺度代表了随雷诺应力而增加的涡流大小。因此，雷诺应力似乎起到了

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