LDV Measurements in Dynamically Separated Flows
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Authors
Chandrasekhara, M.S.
R.D.Van Dyken
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Abstract
Two component, phase averaged mean velocity data have been obtained with an LDV system, on the upper
surface, near the leading edge of an oscillating airfoil undergoing compressible dynamic stall. In particular, the
effect of oscillation amplitude has been studied. The results show that at an oscillation amplitude of 10 degrees, a
separation bubble forms, that eventually bursts on the ripstroke, well beyond the static stall angle. At 2 degrees
amplitude, the bubble forms on the upstroke, but dynamic stall occurs on the downstroke. The results reveal new
flow physics and the data sets serve as valuable quantitative information for validation of unsteady flow codes at
transitional Reynolds numbers. The maximum velocity seen in the flow is about 1.6 times the free stream value and
it occurs slightly downstream of the suction peak location. Some of the measurement difficulties are also discussed.
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(Proc. of the Fifth International Conference on Laser Anemometry - Advances and Applications), Aug.1993, SPIE Vol. 2052, pp. 305-312.
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U.S. Army Research Office under grants MIPR-114-91 and MIPR-130-92
U.S. Air Force of Scientific Research MIPR-92-0004
U.S. Air Force of Scientific Research MIPR-92-0004
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U.S. Army Research Office under grants MIPR-114-91 and MIPR-130-92
U.S. Air Force of Scientific Research MIPR-92-0004
U.S. Air Force of Scientific Research MIPR-92-0004
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M.S.Chandrasekhara and R.D.VanDyken, ﾓLDV Measurements in Dynamically Separated Flowsﾔ, (Proc. of the Fifth International Conference on Laser Anemometry - Advances and Applications), Aug.1993, SPIE Vol. 2052, pp. 305-312.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.