平面壁上の円形断面をもつ鈍い物体まわりの流れ

抄録

This paper describes an experimental study of the flow past blunt obstacle placed on a plane boundary. The experiment was carried out in an N.P.L. blow-down type wind-tunnel having a working section of 400mm×400mm×2, 000mm in size at the REYNOLDS number 4.74×104. The surface-pressure distributions on a sphere, hemisphere cylinder and circular cylinder were measured and the drag and lift coefficients were determined by integration of the surface pressure. The vortices generated in the flow-field around an obstacle have also been observed. Since a hemisphere cylinder is seen to be a hybrid of a sphere and a circular cylinder, the results for hemisphere-cylinder were compared with those for a sphere and a circular cylinder.