Analysis of Compressible Light Dynamic Stall Flow at Transitional Reynolds Numbers
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Authors
Van Dyken, R.D.
Ekaterinaris, J.A.
Chandrasekhara, M.S.
Platzer, M.F.
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Abstract
Numerical and experimental results of steady and light dynamic stall flow over an oscillating NACA 0012 airfoil at
a freestream Mach number of 0.3 and Reynolds number of 0.54 x 10⁶ are compared. The experimental observation
that dynamic stall is induced from the bursting of a laminar separation bubble points to the role of transition in
influencing the flow development. Its modeling, including the changes in transition onset location and transition
length with increase in airfoil angle of attack, is critical for computing the dynamic stall flow properly. In this study,
the transition onset point is specified suitably and a simple transition length model is incorporated to determine
the extent of the laminar separation bubble. The thin-layer approximations of compressible, Reynolds-averaged,
Navier-Stokes equations are used for the numerical solution, with an implicit, upwind-biased, third-order-accurate
scheme for the numerical integration. Remarkably good agreement with experiments is obtained in steady flow
for the pressure and velocity distributions near the leading edge. Oscillatory airfoil flow results compare favorably
on the upstroke, but on the downstroke, the computations do not predict the light stall and vorticity shedding that
were observed experimentally.
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The article of record as published may be found at http://dx.doi.org/10.2514/3.13248
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U.S. Naval Air Warfare Center, Weapons Division, China Lake, CA
U.S. Army Research Office, Durham, NC, ARO-MIPR-125-93
U.S. Army Research Office, Durham, NC, ARO-MIPR-125-93
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U.S. Naval Air Warfare Center, Weapons Division, China Lake, CA
U.S. Army Research Office, Durham, NC, ARO-MIPR-125-93
U.S. Army Research Office, Durham, NC, ARO-MIPR-125-93
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R.D.Van Dyken, J.A.Ekaterinaris, M.S.Chandrasekhara, and M.F.Platzer, ﾓAnalysis of Compressible Light Dynamic Stall Flow at Transitional Reynolds Numbersﾔ, (AIAA Paper 94-2255), AIAA Journal, Vol. 34, No. 7, Jul. 1996, pp. 1420-1427.
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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.