Aerodynamic forces acting on three circular cylinders having different diameters closely arranged in line.

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  • 近接異径３本円柱に働く流体力

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In order to predict the aerodynamic forces acting on the H-II Rocket under development in Japan in a strong wind, experimental studies were carried out. A one-hundredth test model of the actual object is composed of a main circular cylinder and two subcylinders closely arranged in line. The pressure distributions around the cylinders and the Strouhal number behind the cylinder were measured for various attack angles α in the range of the subcritical Reynolds numbers. At α=22° and 33°, the drag and lift coefficients of the main cylinder and the individual subcylinders have either a maxima or minima. These phenomena are closely related to the reattachment of the separated shear layer on the downstream cylinder.

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