Title

Screech tone noise and mode switching in supersonic swirling jets

Authors

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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