Abstract
The effects of the shear level on the vortex shedding from a circular cylinder with its axis normal to the plane of the shear profile were investigated experimentally in the Reynolds number regime of 1.0×104 to 8.8×104. The experiments were conducted in a computer controlled multiple-fan wind tunnel, in which the velocity gradient of the linear shear flow could be altered easily. The normalized shear parameter, β, was varied from 0 to 0.3. It was found that the Strouhal number was not sensitive to the shear parameter, while the time-mean base pressure increased with the shear parameter and the root-mean-square magnitude of the base pressure fluctuations decreased with the shear parameter significantly.
