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Acoustic waves generated by vortex shedding


Nomoto, Hideki (1980) Acoustic waves generated by vortex shedding. Engineer's thesis, California Institute of Technology. doi:10.7907/ghk0-az55.


An internal flow self-sustained oscillation system, which consists of a two-dimensional duct and a pair of baffles inside, is investigated experimentally. This system produces a high amplitude pure tone when certain flow and geometrical conditions are satisfied. The frequency of this generated tone seems to be determined by the longitudinal acoustic modes of the duct, while the dependence of pure tone production on flow and geometrical conditions seems to be related to the interaction between vortex shedding and acoustic feed back mechanism.

Some features on self-sustained oscillation systems are reviewed briefly and Rossiter's idea on the cavity tone system is applied for interpretation of the mechanism of the pure tone production.

Flow visualization shows stable vortical structure of the flow between the baffles when a pure tone is produced.

Item Type:Thesis (Engineer's thesis)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Culick, Fred E. C.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 May 1980
Record Number:CaltechETD:etd-12282005-110713
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5154
Deposited By: Imported from ETD-db
Deposited On:29 Dec 2005
Last Modified:16 Apr 2021 22:57

Thesis Files

PDF (Nomoto_h_1980.pdf) - Final Version
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