The influence of forward flight on the noise generation from convergent-divergent (C-D) nozzle flows was determined experimentally. The experiments were performed in an anechoic chamber using a 2.03 cm diameter C-D nozzle with a design Mach number of 1.4 in a 25 cm diameter free jet flow. Far-field noise measurements and spectral analyses were carried out and visualization of the jet shock structure was made by a spark shadowgraph technique. Jet noise from supersonic C-D nozzle flows under forward flight was found to depend critically on the flight velocity and nozzle pressure ratio. Noise reduction up to 20 dB was observed in the rearward quadrant under flight; excess noise in the forward quadrant under flight resulted from relatively high frequency noise sources in the jet flow field. Screech tones, observed from overexpanded C-D nozzle flows, were suppressed during the simulated flight flow.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Flight effects on supersonic convergent-divergent nozzle jet noise


    Contributors:
    Wat, J. (author) / Sarohia, V. (author)

    Conference:

    Aeroacoustics Conference ; 1981 ; Palo Alto, CA


    Publication date :

    1981-10-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English


    Keywords :



    Computation of supersonic jet mixing noise for an axisymmetric convergent-divergent nozzle

    Khavaran, Abbas / Krejsa, Eugene A. / Kim, Chan M. | AIAA | 1994



    Convergent-divergent nozzle

    ZAHID HUSSAIN | European Patent Office | 2016

    Free access

    Design method of conformal supersonic-speed convergent-divergent nozzle

    FANG LIPEI / XIAO CE / LI ZHE et al. | European Patent Office | 2024

    Free access