Analysis of compressible light dynamic stall flow at transitional Reynolds numbers

R.D. Van Dyken, John A. Ekaterinaris, M.S. Chandrasekhara, M.F. Platzer

    Research output: Contribution to journalJournal articleResearch

    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 10(6) 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 how 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.
    Original languageEnglish
    JournalA I A A Journal
    Volume34
    Issue number7
    Pages (from-to)1420-1427
    ISSN0001-1452
    DOIs
    Publication statusPublished - 1996

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