直線せん断流の性質および円柱まわりの流れに及ぼす速度こう配の影響

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  • Characteristics of Turbulent Linear Shear Flow and the Effect of Velocity Gradient on the Flow around a Circular Cylinder
  • チョクセン センダンリュウ ノ セイシツ オヨビ エンチュウ マワリ ノ ナガ

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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

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