Screech tone noise and mode switching in supersonic swirling jets

    Authors

    Y. K. Yu; R. H. Chen;L. Chew

    Comments

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    Abbreviated Journal Title

    Aiaa J.

    Keywords

    ENHANCEMENT; STABILITY; BLOWOUT; FLAMES; FIELD; FLOW; Engineering, Aerospace

    Abstract

    An experimental study of mode switching phenomena of supersonic jets with swirl is reported. A convergent nozzle with four tangential inlets was used. The pressure ratio corresponds to a fully expanded Mach number up to 1.80. Schlieren visualization of shock structures and pressure measurements indicated effects of swirl, such as flow recirculation. Screech tone frequencies and phase information were measured for both nonswirling and strongly swirling jets. Results suggest existence of quasiperiodic shock structure in strongly swirling jets in spite of swirl generated recirculation. However, pressure fields are quite different between swirling and nonswirling jets. Both helical and toroidal screech tones were found to exist in strongly swirling jets. Strouhal numbers of the swirling jet screech tones are compared with published theory for nonswirling jets.

    Journal Title

    Aiaa Journal

    Volume

    36

    Issue/Number

    11

    Publication Date

    1-1-1998

    Document Type

    Article

    Language

    English

    First Page

    1968

    Last Page

    1974

    WOS Identifier

    WOS:000077014000004

    ISSN

    0001-1452

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