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SUMMARY:Modelling reverse flow dynamic stall on high advance ratio rotors 
 - Anya Jones\, University of Maryland
DTSTART:20180601T120000Z
DTEND:20180601T130000Z
UID:TALK106642@talks.cam.ac.uk
CONTACT:Charlotte Coles
DESCRIPTION:A Mach-scaled slowed rotor was tested at high advance ratios a
 nd time-resolved particle image velocimetry was used to characterize the f
 low field around a blade element in the reverse flow region. Four dominant
  flow structures were observed: the reverse flow starting vortex\, the blu
 nt 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. T
 his affects the strength\, trajectory\, and predicted vortex-induced pitch
 ing moment of the reverse flow dynamic stall vortex. The results of this c
 haracterization and sensitivity study are compared to canonical models of 
 flow reversal and separation. The three-dimensional rotor flows are found 
 to have many similarities to canonical two-dimensional models.
LOCATION: Cambridge University Engineering Department\, LR5
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