Jet-Driven Cylindrical Cavity Oscillators

[+] Author and Article Information
M. E. Franke, G. Jones, W. A. Olsen

Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio

J. Dyn. Sys., Meas., Control 95(2), 125-131 (Jun 01, 1973) (7 pages) doi:10.1115/1.3426665 History: Received August 02, 1972; Online July 13, 2010


The effects of cavity diameter, jet-exit distance, and flow rate on the performance of a jet-driven cylindrical cavity oscillator are investigated experimentally in this study. The cavity oscillator is driven by an air jet that enters the cavity radially through a nozzle located on the periphery of the cavity. The air leaves the cavity perpendicularly to the entering flow through a tube that has its axis parallel to the axis of the cavity. The operating frequencies are found to agree with the eigenfrequencies of the cavity; however, the regions of operation at these frequencies are shown to depend on the flow rate and to exhibit characteristics similar to those of a multistage, jet-edge resonator. The results for several cavity diameters are correlated in terms of a dimensionless frequency and a cavity Reynolds number. Schlieren still photographs and high-speed motion pictures are used to observe the motions of the jet.

Copyright © 1973 by ASME
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