The aeroelastic response of wind turbines is often simulated in the time domain by using indicial response techniques. Unsteady aerodynamics in attached flow are usually based on Jones's approximation of the flat plate indicial response, although the response for finite-thickness airfoils differs from the flat plate one. The indicial lift response of finite-thickness airfoils is simulated with a panel code, and an empirical relation is outlined connecting the airfoil indicial response to its geometric characteristics. The effects of different indicial approximations are evaluated on a 2D profile undergoing harmonic pitching motion in the attached flow region; the resulting lift forces are compared with computational fluid dynamics (CFD) simulations. The relevance for aeroelastic simulations of a wind turbine is also evaluated, and the effects are quantified in terms of variations of equivalent fatigue loads, ultimate loads, and stability limits. The agreement with CFD computations of a 2D profile in harmonic motion is improved by the indicial function accounting for the finite-thickness of the airfoil. Concerning the full wind turbine aeroelastic behavior, the differences between simulations on the basis of Jones's and finite-thickness indicial response functions are rather small; Jones's flat-plate approximation results in only slightly larger fatigue and ultimate loads, and lower stability limits.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Indicial lift response function: an empirical relation for finite-thickness airfoils, and effects on aeroelastic simulations


    Contributors:

    Published in:

    Wind Energy ; 16 , 5 ; 681-693


    Publication date :

    2013


    Size :

    13 Seiten




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    INDICIAL RESPONSE FUNCTION FOR FINITE-THICKNESS AIRFOILS, A SEMI-EMPIRICAL APPROACH

    Gaunaa, M. / Bergami, L. / Heinz, J. et al. | British Library Conference Proceedings | 2011


    Indicial Response Function for Finite-Thickness Airfoils, A Semi-Empirical Approach

    Gaunaa, Mac / Bergami, Leonardo / Heinz, Joachim | AIAA | 2011


    Unsteady Aeroelastic Simulations for Airfoils

    Guilmineau, E. / Queutey, P. | British Library Online Contents | 1997


    Aeroelastic Indicial Response Reduced-Order Modeling for Flexible Flight Vehicles

    Hiller, Brett R. / Frink, Neal T. / Silva, Walter A. et al. | AIAA | 2019


    Aeroelastic Indicial Response Reduced-Order Modeling for Flexible Flight Vehicles

    Hiller, Brett / Frink, Neal T. / Silva, Walter A. et al. | NTRS | 2019