Laser velocimetry measurements of oscillating airfoil dynamic stall flow fieldEnsemble-averaged two-component velocity measurements over an airfoil experiencing oscillatory dynamic stall under compressibility conditions were obtained. The measurements show the formation of a separation bubble over the airfoil that persists till angles of attack close to when the dynamic stall vortex forms and convects. The fluid attains mean velocities as large as 1.6 times the free stream velocity with instantaneous values of 1.8 times the free stream velocity. The airfoil motion induces these large velocities in regions that are far removed from the surface.
Document ID
19910059025
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chandrasekhara, M. S. (NASA Ames Research Center Moffett Field; U.S. Navy-NASA Joint Institute of Aeronautics, Monterey, CA, United States)
Ahmed, S. (MCAT Institute San Jose, CA, United States)