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

[+] Author Affiliations
P. J. Vermeulen, P. Rainville, V. Ramesh

The University of Calgary, Calgary, AB, Canada

Paper No. 91-GT-235, pp. V003T06A021; 8 pages
doi:10.1115/91-GT-235
From:
  • ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Orlando, Florida, USA, June 3–6, 1991
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7900-9
  • Copyright © 1991 by ASME

abstract

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 © 1991 by ASME
Topics: Acoustics , Air jets
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