Event Date/Time
Location
Bowen Hall Rm 222
Series/Event Type
Experiments were performed on a Mach-scaled slowed rotor at high advance ratios along with several more canonical models of this complex flow. Time-resolved particle image velocimetry was used to characterize the flow field around a blade element in the reverse flow region of the rotor and at the mid-span of the non-rotating experiments. On the rotor, four dominant flow structures were observed: the reverse flow starting vortex, the blunt trailing edge wake sheet, the reverse flow dynamic stall vortex, and the tip vortex. As advance ratio increases, the duration of reduced time that the blade element spends in the reverse flow region also increases. This affects the strength, trajectory, and predicted vortex-induced pitching moment of the reverse flow dynamic stall vortex. The results of this characterization and sensitivity study are found to have many similarities to canonical two-dimensional models.