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RESEARCH PAPERS: Noise Control and Acoustics

Controlled Excitation of a Cold Turbulent Swirling Free Jet

[+] Author and Article Information
R. Taghavi

Center for Research Inc., The University of Kansas, Lawrence, KS

E. J. Rice

Aerodynamics Branch, NASA Lewis Research Center, Cleveland, OH

S. Farokhi

Aerospace Engineering Department, The University of Kansas, Lawrence, KS

J. Vib., Acoust., Stress, and Reliab 110(2), 234-237 (Apr 01, 1988) (4 pages) doi:10.1115/1.3269504 History: Received September 18, 1987; Online November 23, 2009

Abstract

Experimental results from acoustic excitation of a cold free turbulent jet with and without swirl are presented. A flow with a swirl number of 0.35 (i.e., moderate swirl) is excited internally by plane acoustic waves at a constant sound pressure level and at various frequencies. It is observed that the cold swirling jet is excitable by plane waves, and that the instability waves grow about 50 percent less in peak r.m.s. amplitude, and saturate further upstream compared to corresponding waves in a jet without swirl having the same axial mass flux. The preferred Strouhal number based on the mass-averaged axial velocity and nozzle exit diameter for both swirling and nonswirling flows is 0.4. So far no change in the mean velocity components of the swirling jet is observed as a result of excitation.

Copyright © 1988 by ASME
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