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Type of Document	Engineer's Thesis
Author	Nomoto, Hideki
URN	etd-12282005-110713
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-12282005-110713
Title	Acoustic waves generated by vortex shedding
Degree	Engineer's Degree
Option	Aeronautics
Advisory Committee	Advisor Name Title Fred Culick Committee Chair
Keywords	none
Date of Defense	1980-05-01
Availability	restricted
Abstract 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.
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