Measurements of the Entrainment Coefficient of Acoustically Pulsed Axisymmetric Free Air Jets

[+] Author and Article Information
P. J. Vermeulen, P. Rainville, V. Ramesh

The University of Calgary, Department of Mechanical Engineering, Calgary, Alberta T2N 1N4 Canada

J. Eng. Gas Turbines Power 114(2), 409-415 (Apr 01, 1992) (7 pages) doi:10.1115/1.2906606 History: Received March 04, 1991; Online April 24, 2008


Novel direct measurements of the entrainment coefficient in the initial zone of a pulsating air jet have been successfully accomplished. A series of pulsating air jets flowing from different nozzle orifice sizes into surrounding air were investigated for the effects of jet axial length, excitation power, and Strouhal number. The entrainment coefficient of the excited jet varied strongly with axial distance downstream of the orifice exit plane and with pulsation strength. The acoustic drive considerably increased the entrainment coefficient by up to 4.6 times at 10 diameters downstream of the nozzle. There was only a tendency for the entrainment coefficient to increase with the Strouhal number and hence an optimum Strouhal number for jet response was not found.

Copyright © 1992 by The American Society of Mechanical Engineers
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