DOI: 10.1615/TSFP5
THE EFFECTS OF LEADING AND TRAILING EDGE DETAILS ON THE FLOW AROUND ELONGATED BLUFF BODIES
摘要
The influence of leading and trailing edge geometry on the flows around four elongated cylinders was examined. In particular, the mean flow characteristics around the bodies (including the distance from the leading edge to the reattachment point, the boundary layers thickness at the the trailing edge, the speed-up at the leeward trailing edge) and in the wakes, particularly the details of the vortex streets, were examined. It was found that there is no simple scaling relationship linking the various vortex street parameters such as the spacing ratio, b/a, the vortex convection speeds, and vortex strengths so that there is no universal Strouhal number for these flows. It appears that the diffuse separated shear layers are the main cause of this lack of universality in vortex streets, so that each vortex street depends on the precise way it came to be formed.