S0502-5-1 Effect of Interaction between Horseshoe Vortex and Co-rotating Longitudinal Vortices with Different Configuration

A horseshoe vortex is generated at a wing-body junction, and causes various engineering problems. Recent trend for the requirement of energy saving and high efficiency in the design of fluid machinery clearly shows an importance of the control of the horseshoe vortex. In this study, the effects of interaction of the horseshoe vortex with co-rotating longitudinal vortices introduced by the vortex generators on the vortex behavior, the total pressure and the drag force are investigated. The experiments are conducted under the different conditions about strength and spacing of longitudinal vortex pair. NACA 0024 airfoil is set at zero angle of attack. The momentum thickness Reynolds number of the turbulent boundary layer is 1700. Although the total pressure loss is increased by setting the vortex generators, the horseshoe vortex can be moved away from the blade in the narrow spacing of vortex pair and be decayed in the wide spacing by the vortex interaction. The drag force is decreased by selecting appropriate vortex configuration.