An engine arrangement for a supersonic cruise vehicle (SCV) has been developed that shows promise for jet noise reduction without the performance penalties associated with mechanical suppressors and engine oversizing. This arrangement, wherein two engines are placed on top of the wing directly above two similarly-mounted engines below the wing, can produce 3 to 5 dB less noise below the aircraft flight path than when four engines are installed under the wing. This noise reduction is due to acoustic shielding of the upper jets by the lower jets. Test data are reviewed to verify this acoustical shielding phenomenon, and detailed takeoff trajectories are calculated to show the effects of sideline and flyover noise levels on constraining maximum range SCV configurations. Engine placement variation and differential throttling, wherein thrust is unloaded from the lower engine and added to the upper engine, are to be explored as means for maximizing the shielding effect.


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    Title :

    Twin jet noise shielding for a supersonic cruise vehicle


    Contributors:

    Conference:

    American Institute of Aeronautics and Astronautics, Aeroacoustics Conference ; 1979 ; Seattle, WA


    Publication date :

    1979-03-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




    Twin-Jet Noise Shielding for a Supersonic Cruise Vehicle

    J. S. Clauss B. R. Wright / G. E. Bowie | AIAA | 1980


    Twin jet noise shielding for a supersonic cruise vehicle

    CLAUSS, JR., J. / WRIGHT, B. / BOWIE, G. | AIAA | 1979



    Supersonic Cruise Technology

    F. E. McLean | NTIS | 1985


    Supersonic cruise Technology

    MacLean, F. E. / USA, National Aeronautics and Space Administration | TIBKAT | 1985