Helicopter rotor blades frequently encounter dynamic stall during normal flight conditions, limiting the applicability of classical thin airfoil theory at large angles of attack. Also, it is evident that because of the largely different conditions on the advancing and retreating sides of the rotor, future rotorcraft may incorporate dynamically morphing airfoils (trailing-edge flaps, dynamic camber, dynamic droop, etc.). Reduced-order aerodynamic models are needed for preliminary design and flight simulation. A unified model for predicting the airloads on a morphing airfoil in dynamic stall is presented, consisting of three components. First, a linear airloads theory allows for arbitrary airfoil deformations consistent with a morphing airfoil. Second, to capture the effects of the wake, the airloads theory is coupled to an induced flow model. Third, the overshoot and time delay associated with dynamic stall are modeled by a second-order dynamic filter, along the lines of the ONERA dynamic stall model. This paper presents a unified airloads model that allows arbitrary airfoil morphing with dynamic stall. Correlations to experimental data validate the theory.


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    Titel :

    Unified airloads model for morphing airfoils in dynamic stall


    Weitere Titelangaben:

    Vereinigtes Luftlastmodell für formadaptive Flügelblätter mit dynamischem Überziehen


    Beteiligte:


    Erscheinungsdatum :

    2010


    Format / Umfang :

    24 Seiten, 41 Bilder, 1 Tabelle, 23 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Unified Airloads Model for Morphing Airfoils in Dynamic Stall

    Ahaus, L.A. / Peters, D.A. / AHS International | British Library Conference Proceedings | 2010


    Simplified Analysis of Sectional Airloads on Morphing Airfoils

    Ahaus, L.A. / Kahler, A.J. / Peters, D.A. et al. | British Library Conference Proceedings | 2010


    A state-space airloads theory for flexible airfoils

    Peters, David A. / Hsieh, Mong-Che A. / Torrero, Almudena | Tema Archiv | 2006


    A State-Space Airloads Theory for Flexible Airfoils

    Peters, D. / Hsieh, M.-C. A. / Torrero, A. et al. | British Library Conference Proceedings | 2006


    A State-Space Airloads Theory for Flexible Airfoils

    Peters, David A. | Online Contents | 2007