A reduced-order, unsteady aerodynamic model for deployable Gurney flaps is formulated based on indicial concepts. The model is developed in the time domain to ensure applicability to arbitrary deployments. It takes into account compressibility effects as well as the nonlinear aerodynamic effectiveness of Gurney flaps with respect to their height. The model can be used to predict the aerodynamics of Gurney flaps that are positioned either upstream or at the trailing edge of the airfoil. Upstream Gurney flaps have been shown to be more complex to model because of the formation and convection of lower-surface vortices following their deployment. These vortical disturbances can introduce nonharmonic components in the aerodynamic response, substantially affecting the loads and complicating the analysis. The adopted approach takes advantage of Duhamel’s superposition principles to model these vortex effects. A physics-based methodology is used to minimize the number of constants and improve generality. Both lift and pitching-moment coefficients can be obtained as outputs. The model indicial constants are extracted from computational-fluid-dynamics calculations obtained for a number of flow conditions and deployment schedules. The model is computationally inexpensive and should be adequate for use during preliminary design studies in various aerospace applications.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Unsteady Aerodynamic Model for Deployable Gurney Flaps Based on Indicial Concepts


    Contributors:

    Published in:

    Journal of Aircraft ; 54 , 4 ; 1375-1387


    Publication date :

    2017-07-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Aircraft longitudinal unsteady aerodynamic modeling using indicial function

    Zhou, Chijun / Zhu, Jihong / Lei, Humin | IEEE | 2016


    A Nonlinear Indicial Prediction Tool for Unsteady Aerodynamic Modeling

    Reisenthel, P. / Bettencourt, M. / Myatt, J. et al. | British Library Conference Proceedings | 1998


    A nonlinear indicial prediction tool for unsteady aerodynamic modeling

    Reisenthel, Patrick / Bettencourt, Matthew / Mayatt, James et al. | AIAA | 1998