The unsteady flowfield of a propfan operation at takeoff conditions with angular inflow is examined by solving the three-dimensional Euler equations. The operating conditions considered are: Mach no. = 0.31, advance ratio = 1.6, and inflow angle to the propfan = 8.3 deg. The predicted results clearly show the cyclic variations of the blade power and thrust coefficients due to angular inflow. The flow changes from blade passage to passage are illustrated in terms of static pressure contours. The predicted blade surface pressure waveforms were compared with flight measurements. The predictions at the inboard radial station, r/R = 0.68, show reasonable agreement with flight data. At the outboard radial station, r/R = 0.95, where the interactions of the tip vortex, the tip-region flow and the blade wake appear to result in a complex nonlinear measured response. The prediction shows poor agreement.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Unsteady flowfield of a propfan at takeoff conditions


    Contributors:

    Conference:

    International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines and Propellers ; 1991 ; Notre Dame, IN, United States


    Publication date :

    1991-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Unsteady Flowfield Simulation of Ducted PropFan Configurations

    J. Mark Janus / Howard Z. Horstman / David L. Whitfield | AIAA | 1999





    Unsteady blade pressures on a propfan at takeoff - Euler analysis and flight data

    NALLASAMY, M. / NASA, Lewis Research Center / Cleveland, OH | AIAA | 1993