The TURNS Navier-Stokes analysis was applied in hover to the Black Hawk and 3-to-1 tapered-tip model rotor to evaluate its ability for hover performance prediction. The analysis utilizes a low-dissipative third-order accurate upwinded scheme and a blade-to-blade periodic grid to capture the rotor wake. Calculations were made for two rotors over a wide range of thrust coefficients. The elastic twist and coning measured by experiment were included in the model. Comparisons with experimental torque and figure of merit were made, and the flowfield was examined in detail. The correlation with experimental figure of merit, using meshes with 380,000 to 950,000 grid points, was considered to be fair for design purposes. The discrepancies with experimental performance data are believed to be due to an inaccurate prediction of the tip-vortex position and strength, resulting in poor loading predictions over the outer span of the blade. The finest grid calculations improved the results, indicating that the results may be improved by more grid refinement and improved meshing. Continued research in the area of grid adaptation and higher-order schemes is necessary to improve the resolution of the tip vortex for the hovering rotor.


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    Title :

    Evaluation of a Navier-Stokes analysis method for hover performance prediction


    Additional title:

    Anwendung einer Navier-Stokes-Analysemethode zur Vorhersage des Gleitflugverhaltens eines Hubschraubers


    Contributors:
    Wake, B.E. (author) / Baeder, J.D. (author)

    Published in:

    Publication date :

    1996


    Size :

    11 Seiten, 17 Bilder, 23 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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