A Study of Dynamic Stall Using Real Time Interferometry
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Dynamic stall over an oscillating airfoil in compressible flow was studied using a real-tine interferometry technique. Instantaneous flow field data was obtained for various unsteady as well as steady flow conditions. The details of the dynamic stall vortex, including its formation and development have been revealed by the interferograms, resulting in the first documentation of the complete dynamic stall flow field under compressible flow conditions. Comparison of steady flow interferograms with those taken in unsteady flow reveal significant delay in development of leading edge suction peaks in the unsteady case. The interferograms permit detailed analysis of the leading edge pressure field; as many as 13 pressure values have been obtained around the leading edge in the first 1% of the airfoil chord. The results offer significant new insight into the character of the dynamic stall vortex, and the stall delay that is observed during dynamic notions.
29th Aerospace Sciences Meeting January 7-10, 1991/Reno, Nevada
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Grohsmeyer, Steven P. (Monterey, California: Naval Postgraduate School, 1990-09);The dynamic stall of rapidly pitching and oscillating airfoils is investigated by the numerical solution of the full compressible unsteady two- dimensional Navier-Stokes equations using an alternating-direction-implicit ...
Chandrasekhara, M.S.; Platzer, M.F. (1992-11);The research was carried out in the Compressible Dynamic Stall Facility, CDSF, at the Fluid Mechanics Laboratory (FML) of NASA Ames Research Center. The facility can produce realistic nondimensional pitch rates experienced ...
Grohsmeyer, Steven P.; Ekaterinaris, John A.; Platzer, Max F. (1991-06);The dynamic stall of pitching airfoils is investigated by the numerical solution of the full compressible unsteady two-dimensional Navier-Stokes equations using an alternating-direction-implicit scheme. The flow is ...