S053044 Aerodynamics of a Circular Cylinder Supported by End Walls : Effects of Aspect Ratio and Laminar Boundary Layer

Abstract

The effects of laminar boundary layer thickness and aspect ratio on the aerodynamics of a circular cylinder supported by two large end-walls is studied by the measurements of surface pressure, turbulent intensity and velocity spectrum. As the results, it is found that the base pressure coefficient on the circular cylinder increases remarkably when laminar boundary layer is thick and aspect ratio is small. And, a new Strouhal number is observed in the wake region close to the end-wall where the contribution of Karman vortex decreases.