A method for predicting jet mixing and shock noise spectra from coannular plug nozzles operated in the inverted velocity profile mode is presented. The jet mixing noise prediction method is based on the physics of the flow and its noise radiating characteristics, modelling the source spectrum, eddy convection and fluid shrouding in a simplistic fashion. It uses an empirically derived coannular plug nozzle fluid shrouding model for the effects of the mean flow on the noise radiating eddies. Because of this technique of modelling, the method is capable of predicting the jet mixing noise radiating characteristics of coannular plug nozzles in flight without using the conventional velocity exponent method. The shock noise prediction procedure is an extension of the Fisher-Harper-Bourne method for conic nozzles, with a proper choice of the characteristic pressure ratio and turbulence convection velocity. The jet mixing and shock noise prediction routines together predict the noise radiating characteristics of coannular plug nozzles with good agreement over a range of operating conditions and varying geometric parameters. The method has the potential of being extended to suppressors of complex geometries. This work was done under NASA Lewis Research Center contract NAS3-20619. (Krautzig)


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    Titel :

    A unique coannular plug nozzle jet noise prediction procedure


    Weitere Titelangaben:

    Eine Vorhersagemethode fuer die Laermentwicklung des Ringstrahls einer kegelfoermigen Duese


    Beteiligte:
    Bhutiani, P.K. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1980


    Format / Umfang :

    10 Seiten, 13 Bilder, 22 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch