A JT15D fan stage was acoustically tested in the NASA Lewis anechoic chamber as part of the joint Lewis-Langley Research Center investigation of flight simulation techniques and flight effects using the JT15D engine as a common test vehicle. Suspected rotor-downstream support strut interaction was confirmed through the use of simulated support struts which were tested at three axial rotor-strut spacings. Tests were also performed with the struts removed. Inlet boundary layer suction in conjunction with an inflow control device was also explored. The removal of the boundary layer reduced the fan fundamental tone levels suggesting that the mounting and mating of such a device to the nacelle requires careful attention. With the same inflow control device installed good acoustic agreement was shown between the engine on an outdoor test stand and the fan in the anechoic chamber.


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    Title :

    Tone generation by rotor-downstream strut interaction


    Contributors:

    Conference:

    American Institute of Aeronautics and Astronautics, Aeroacoustics Conference ; 1983 ; Atlanta, GA


    Publication date :

    1983-04-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




    Tone generation by rotor-downstream strut interaction

    Woodward, R. P. / Balombin, J. R. | NTRS | 1983


    Tone Generation by Rotor-Downstream Strut Interaction

    R. P. Woodward / J. R. Balombin | NTIS | 1983


    Tone generation by rotor-downstream strut interaction

    WOODWARD, R. / BALOMBIN, J. | AIAA | 1983


    Tone generation by rotor-downstream strut interaction

    Woodward, R. P. / Balombin, J. R. | NTRS | 1984


    Tone generation by rotor-downstream strut interaction

    WOODWARD, R. P. / BALOMBIN, J. R. | AIAA | 1984