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RESEARCH PAPERS

Measurements of Entrainment by Acoustically Pulsed Axisymmetric Air Jets

[+] Author and Article Information
P. J. Vermeulen, V. Ramesh, Wai Keung Yu

Department of Mechanical Engineering, The University of Calgary, Calgary, Alberta, Canada

J. Eng. Gas Turbines Power 108(3), 479-484 (Jul 01, 1986) (6 pages) doi:10.1115/1.3239933 History: Received January 17, 1986; Online October 15, 2009

Abstract

Direct measurements of entrainment by acoustically pulsed axisymmetric air jets flowing into surrounding air have been made for a range of orifice sizes, Strouhal numbers, and excitation powers. The entrainment was considerably increased, by up to 5.8 times at distances greater than 15 diameters axially downstream of the orifice exit plane. The entrainment of the excited jet varied linearly with downstream distance. The jet response varied nonlinearly with excitation strength, indicating that there may be a practical upper limit to the acoustic augmentation of entrainment. The response depends on Strouhal number and appears to be optimum at about 0.25.

Copyright © 1986 by ASME
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