A free jet is utilized to investigate the changes in the noise received from supersonic jets in high speed subsonic flight. Flight Mach numbers to 0.9 are simulated for supersonic jets with fully expanded Mach numbers between 1 and 2. Plume pressure measurements show only minor changes in the shock structure of off-design jets up to a Mach number of 0.6. Correspondingly, far-field noise measurements indicate little change to the broadband shock noise emitted at right angles to the jet. However, measurements within the free jet show that convection effects on the noise are substantial, and that the point source convective amplification that is proportional to the fourth power of the Doppler factor may apply for broadband shock noise in flight. Measurements of jet mixing noise for an on-design supersonic jet show that the current predictions of mixing noise in flight can be extended to flight Mach numbers of at least 0.5.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Simulated high speed flight effects on supersonic jet noise


    Contributors:

    Conference:

    AIAA, Aeroacoustics Conference ; 1993 ; Long Beach, CA, United States


    Publication date :

    1993-10-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Simulated High Speed Flight Effects On Supersonic Jet Noise

    Norum, T. D. / Brown, M. C. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 1993


    Simulated high speed flight effects on supersonic jet noise

    Norum, Thomas / Brown, Martha | AIAA | 1993


    Simulated Flight Effects on Supersonic Jet Noise from Round Nozzles

    Schlinker, Robert / Simonich, John / Reba, Ramons | AIAA | 2010


    Supersonic Jet Exhaust Noise at High Subsonic Flight Speed

    T. D. Norum / D. P. Garber / R. A. Golub et al. | NTIS | 2004