THE EVOLUTION OF STARTING VORTEX AND SECONDARY SEPARATION ON AN ELLIPTIC CYLINDER

摘要

Flow visualization was used to investigate experimentally the evolution process fromsymmetrical shedding to staggered shedding of the starting vortex and the phenomenon of secondaryseparation on an elliptic cylinder at moderate Reynolds numbers.The vortex structure of the flowseparation was studied.The temporal variation of separation angle and length of wake vortex weregiven.The photographs and experimental results provided basis for further investigation of the complicatedfeature of the starting process of unsteady separated flows around an elliptic cylinder.