Effect of side walls of wind-tunnel on turbulent wake behind two-dimensional bluff body

This paper presents an experimental investigation of the effects of side walls of a wind-tunnel on the turbulent wake behind a two-dimensional flat plate. The drag of a flat plate, the frequency of vortices shedding, the dimension of the vortex street, the velocity and static pressure in the wake and the turbulence of wake behind a flat plate were measured for various distances between side walls of a wind-tunnel. It is found that the drag coefficient of a flat plate increases, while the wake region is reduced, and the turbulence of the wake increases as the width of flat plate increases. The blockage effect of side walls may be ignored when the ratio of (width of bluff body)/(distance between side walls) is less than 0.05.