Vortex Structure Comparison Between a Novel Reduced Tip Vortex Rotary Blade and a Traditional Blade

The flow of a novel 18-inch rotor designed to reduce tip vortex strength was analyzed. The rotor was observed using stereo particle image velocimetry (PIV). During data acquisition, the rotor maintained a steady number of rotations per minute (RPM). Data were obtained as instantaneous snapshots and phase locked averages at several distinct phase angles. Non-local vortex identification methods were employed to characterize the vortices generated. Results were compared to those of a traditional power-optimized rotor to assess the effectiveness of the reduced vortex design. Significant differences in flow and vortex structure were observed between the two rotors.