This paper examines the helicopter/ship dynamic interface by combining both experimental and numerical analysis. The flow field over the flight deck of a frigate model was mapped experimentally in a wind tunnel using both stationary and flying hot-film sensors. Using the velocity time-histories measured in the wind tunnel, a numerical representation of the airwake which shares the same spectral characteristics was generated. A blade-element model of the main rotor of a helicopter was then 'flown' in this numerical airwake to determine the steady and unsteady loads acting on the rotor. The results of a set of test simulations indicate: that an increase in unsteady rotor loads occurs when spatial cross-correlation functions are included in the generation of the numerical flow field; that the fluctuating vertical velocity has a greater effect on the unsteady rotor loads than the fluctuating horizontal velocity; that the spectra of unsteady forces and moments show similar broadband and resonant behaviour at different free-stream velocities.


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    Title :

    Analysis of rotor forces in a ship airwake


    Additional title:

    Eine Untersuchung der Belastungen die auf ein Hubschrauberrotorblatt einwirken, das sich im Nachstrom eines Schiffes befindet


    Contributors:
    Syms, G. (author) / Zan, S.J. (author)


    Publication date :

    1995


    Size :

    12 Seiten, 8 Bilder, 1 Tabelle, 13 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Analysis of Rotor Forces in a Ship Airwake

    Syms, G. / Zan, S. J. / Advisory Group for Aerospace Research and Development et al. | British Library Conference Proceedings | 1995


    Ship Airwake Effects of Helicopter Rotor Aerodynamic Loads

    Zhang, H. / Prasad, J. / Mavris, D. et al. | British Library Conference Proceedings | 1994


    Ship airwake effects on the helicopter rotor aerodynamic loads

    Zhang, Hong / Prasad, J. / Mavris, Dimitri | AIAA | 1994