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Predicting blade vortex interaction, airloads and acoustics using the vorticity transport model

Kelly, Mary E. and Duraisamy, Karthikeyan and Brown, Richard (2008) Predicting blade vortex interaction, airloads and acoustics using the vorticity transport model. In: 9th American Helicopter Society Aeromechanics Specialists' Meeting, 2008-01-23 - 2008-01-25, San Francisco, California.

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    Abstract

    Interactions between the blades and vortical structures within the wake of a helicopter rotor are a significant source of impulsive loading and noise, particularly in descending flight. Advances in the prediction and understanding of such blade vortex interactions have been aided in recent years by the extensive experimental dataset made available through the HART test programme. Brown's Vorticity Transport Model was used to predict the rotor blade loading, the resultant wake system and the acoustic noise radiation for the HART II rotor. The vorticity conserving properties of the Vorticity Transport Model allow the detailed wake features that are associated with blade vortex interactions to be resolved. The experimental airload data, in particular the higher harmonic loading associated with blade vortex interactions, is matched well by the computations. The computed vorticity distribution in the wake also shows good correlation with the experimentally measured vortex positions. Including a representation of the fuselage within the computation yields marked improvement in the prediction of the vortex positions compared to similar calculations with an isolated rotor. An accoustic analysis, based on a Ffowcs-Williams Hawkings approach, is able to predict accurately the locations of the sound pressure maxima and the upstream attenuation of the sound radiated by the rotor. The principal discrepancies in airload, vortex position and acoustic prediction are confined almost exclusively to the rear of the advancing side of the rotor and, if errors in measuring the blade deflection can be discounted, may be due to minor inaccuracies in modelling the roll-up of the wake.

    Item type: Conference or Workshop Item (Paper)
    ID code: 27495
    Keywords: blade vortex interaction, vorticity transport model, HART test programme, acoustic noise radiation, rotor blade loading, accoustic analysis, Mechanical engineering and machinery, Motor vehicles. Aeronautics. Astronautics, Mechanical Engineering, Aerospace Engineering, Computational Mechanics, Modelling and Simulation
    Subjects: Technology > Mechanical engineering and machinery
    Technology > Motor vehicles. Aeronautics. Astronautics
    Department: Faculty of Engineering > Mechanical and Aerospace Engineering
    Related URLs:
    Depositing user: Ms Katrina May
    Date Deposited: 28 Sep 2010 10:49
    Last modified: 04 Jun 2014 02:31
    URI: http://strathprints.strath.ac.uk/id/eprint/27495

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