This paper presents a computational study of unsteady transonic effects on a pitching supercritical laminar airfoil using high-order implicit large-eddy simulation. A CAST10-2 airfoil operating at a chord-based Reynolds number of R e c = 2 × 10 6 , a transonic freestream Mach number of M = 0.73 , and a small nominal angle of attack of α o = 0.9 deg was subjected to forced pitching oscillations about the quarter-chord with a small amplitude of | Δ α | = 0.72 deg and reduced frequencies of k = 0.175 , 0.23, and 0.285. Complex interactions between flow separation, the motion of multiple shocks, and excursions of transitional flow were elucidated and compared against inviscid simulations. The boundary layer was found to be highly sensitive to pitch frequency, due in large part to the effects of frequency on shock motion. C M was found to be indirectly affected by the impact of shock motion on the boundary-layer state. Aerodynamic damping diminished with increasing oscillation frequency until becoming negative at k = 0.285 , indicating potential for aeroelastic instability.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Unsteady Flow Transition Effects on a Pitching Transonic Laminar Airfoil 


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 61 , 3 ; 1048-1060


    Erscheinungsdatum :

    2022-12-26


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Unsteady Flow Transition Effects on a Transonic Laminar Airfoil

    Barnes, Caleb J. / Visbal, Miguel R. | AIAA | 2022




    First Results of Lifetime-Based Unsteady PSP Measurement on a Pitching Airfoil in Transonic Flow

    Sugioka, Yosuke / Nakakita, Kazuyuki / Saitoh, Kenichi et al. | AIAA | 2018


    Computation of transonic viscous flow around a pitching airfoil

    Dai, J. / Liu, Q. | British Library Online Contents | 1996