Effects of dynamic stall and three-dimensional wake on the stability of an isolated hingeless rotor are investigated. The investigation is based on the correlation with measured lag regressive-mode damping levels of a soft-inplane, three-blade rotor operated untrimmed. The correlation covers a broad range of data, from near-zero thrust conditions in hover to high-thrust and highly stalled conditions in forward flight with advance ratio as high as 0.55 and shaft angle as high as 20 deg. The ONERA dynamic stall models of lift, drag and pitching moment and a finite-state three-dimensional wake model are used. The root-flexure-blade assembly of the experimental rotor is modeled by an offset-hinged rigid flap-lag model and by three elastic blade models, which differ in modeling the root flexure. The periodic forced response and the Floquet transition matrix about that response are obtained by periodic shotting; the damping levels are generated from a full Floquet eigenanalysis that includes all the structural and aerodynamic states. The correlation demonstrates the need to include dynamic stall and three-dimensional wake in lag-damping predictions.


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    Title :

    Effects of dynamic stall and three-dimensional wake on aeroelastic stability of isolated hingeless rotors with experimental correlation


    Additional title:

    Die Auswirkungen eines dynamischen Strömungsabrisses und dreidimensionaler Rotorströmung auf die aeroelastische Stabilität von isoliert, gelenkfreien Hubschrauberrotoren mit experimenteller Korrelation


    Contributors:


    Publication date :

    1994


    Size :

    15 Seiten, 16 Bilder, 13 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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