Retreating side helicopter blades often experience stall when flying at high speeds or at high thrust. There are a number of consequences to stall which result in significant increases in blade stresses, vibration levels, pitch link loads and required shaft power. No real confidence exists today for the prediction of these effects on actual helicopter rotors since the models used in existing aeroelastic codes have usually been elaborated from simple 2D wind tunnel tests. A GARTEUR Action Group (Group for Aeronautical Research and Technology in EURope) has been assembled to evaluate the capabilities of the up-to-date dynamic stall models used in Europe for the prediction of rotor behavior in presence of stall, the work of which is reported here. Seven different stall models are described and then fitted to reproduce to experimental 2D hysteresis loops. A series of calculations is then carried out for a flight condition with a high load factor. The unsteady stall models used are finally evaluated against detailed measurements on a model rotor in a wind tunnel. Conclusions are drawn relative to the state-of-the-art of dynamic stall models, blade torsion and of rotor calculations in general.


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    Title :

    Stall effects and blade torsion - An evaluation of predictive tools


    Additional title:

    Strömungsabreißeffekte und Torsionsspannung - eine Bewertung von Vorhersagemodellen


    Contributors:
    Petot, D. (author) / Arnaud, G. (author) / Harrison, R. (author) / Stevens, J. (author) / Dieterich, O. (author) / Wall, B.G. van der (author) / Young, C. (author) / Szechenyi, E. (author)

    Published in:

    Publication date :

    1999


    Size :

    12 Seiten, 4 Bilder, 2 Tabellen, 16 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Stall effects and blade torsion - an evaluation of predictive tools

    Petot, D. / Arnaud, G. / Harrison, R. et al. | Tema Archive | 1997


    Stall Effects and Blade Torsion - An Evaluation of Predictive Tools

    Petot, D. / Szechenyi, E. / Arnaud, G. et al. | British Library Conference Proceedings | 1997


    HELICOPTER ROTOR BLADE STALL DETECTOR

    L VOV NIKOLAJ LEONIDOVICH / KHABAROV STANISLAV SERGEEVICH / NOSOV ANDREJ ANATOL EVICH et al. | European Patent Office | 2015

    Free access

    Blade Stall During Take-off

    Emerald Group Publishing | 1942