Development of Phased Twin Flip-Flop Jets

[+] Author and Article Information
G. Raman

NYMA Inc., Experimental Fluid Dynamics Section, NASA Lewis Research Center Group, Brookpark, OH 44142

E. J. Rice

NASA Lewis Research Center, Cleveland, OH 44135

J. Vib. Acoust 116(3), 263-268 (Jul 01, 1994) (6 pages) doi:10.1115/1.2930423 History: Received October 01, 1993; Online June 17, 2008


The flip-flop nozzle is a device that can produce an oscillating jet flow without any moving parts. There is now a renewed interest in such nozzles due to their potential for use as excitation devices in practical applications. An experiment aimed at developing twin flip-flop jets that operate at prescribed frequencies and phase differences was performed. The phasing was achieved using two different nozzle interconnection schemes. In one configuration the two jets flapped in-phase and in another they flapped out-of-phase with respect to each other. In either configuration the frequencies of oscillation of both jets were equal. When one of the jets was run at a constant high velocity and the velocity of the second jet was increased gradually, the higher velocity jet determined the frequency of oscillation of both jets. The two flip-flop jet configurations described in this paper could be used to excite a primary jet flow in either an anti-symmetric (sinuous) or a symmetric (varicose) mode.

Copyright © 1994 by The American Society of Mechanical Engineers
Topics: Jets , Nozzles , Oscillations
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