With multi-stream coannular nozzles, sometimes tones are generated that make the nozzle fail noise regulation criteria. A two-stream nozzle was studied experimentally in an attempt to identify the sources of such tones and explore remedies. With the given nozzle configuration, sharp tones occurred in a range of low jet Mach numbers (M (sub j)). The tones could be traced to a coupling of vortex shedding from the struts, that hold the nozzles and the center-body together, and various acoustic resonance modes of the ducts. A leading edge treatment of the struts is shown to suppress the vortex shedding and eliminate the tones.


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    Title :

    Tones Encountered with a Coannular Nozzle and a Method for their Suppression


    Contributors:

    Conference:

    American Institute of Aeronautics and Astronautics (AIAA) Aviation Forum 2017 Aeroacoustics Conference ; 2017 ; Denver, CO, United States


    Publication date :

    2017-06-05


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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