Controlled Excitation of a Cold Turbulent Swirling Free Jet

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...

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Bibliographic Details
Published in:Journal of vibration and acoustics 1988-04, Vol.110 (2), p.234-237
Main Authors: Taghavi, R, Rice, E. J, Farokhi, S
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fluid dynamics
Fluid Mechanics And Heat Transfer
Fundamental areas of phenomenology (including applications)
Nonhomogeneous flows
Physics
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Summary: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.
ISSN:1048-9002
0739-3717
1528-8927
2161-9611
DOI:10.1115/1.3269504