GEOMETRIC ROUGHNESS EFFECTS ON THE AERODYNAMIC CHARACTERISTICS OF A SPINNING CYLINDER IN CROSSFLOW

摘要

An experimental study is presented, assessingthe effect of different configurations of relativelylarge scale geometric surface roughness on theaerodynamic performance of a spinningcylinder in crossflow. The characteristics of thebaseline smooth surface spinning cylinder weremeasured and analyzed using computationalfluid dynamics, before the roughnessconfigurations were experimentally assessed.Spanwise ribs, crossing the entire length ofthe cylinder with no gaps, have been found to besignificantly more effective in augmentingspinning cylinder lift, with higher lift to dragratio, than employing streamwise ribs or largescale geometric roughness elements – in thiscase diamond protuberances.