A new method of supersonic jet screech tone reduction is presented. The method utilizes a sound reflecting surface positioned upstream of the nozzle exit a distance of one-quarter wavelength of the fundamental screech tone. The reflector establishes a standing wave pattern of acoustic waves with a node at the nozzle exit plane. The pressure minimum at the exit halts the screech tone feedback mechanism. Experimental results indicate that the method eliminates supersonic jet screech as effectively as the currently accepted technique using an intrusive tab, but without distortion of the jet flow. The change in shock cell spacing, which occurs with an intrusive tab, does not occur when screech is cancelled with the new technique. The broadband shock-associated noise is also influenced much less when the jet screech tones are eliminated by the new method.


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    Title :

    Supersonic jet screech tone cancellation


    Additional title:

    Die Unterdrueckung des Ueberschallknalls bei Duesenflugzeugen


    Contributors:

    Published in:

    AIAA Journal ; 21 , 11 ; 1541-1545


    Publication date :

    1983


    Size :

    5 Seiten, 9 Bilder, 14 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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