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Ejector Pumping Enhancement Through Pulsing Primary Flow

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

University of Calgary, Calgary, AB, Canada

D. N. Miller, P. J. Yagle, E. E. Bender

Lockheed Martin Aeronautics Company, Fort Worth, TX

Paper No. GT2002-30007, pp. 57-65; 9 pages
doi:10.1115/GT2002-30007
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 1: Turbo Expo 2002
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3606-1 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

Computational Fluid Dynamics analysis for a novel pulsed-ejector showed that the pumping effectiveness (ratio of secondary (entrainment) to primary mass flow rate) was significantly increased relative to the unpulsed ejector, and that this was optimized by pulsing at off-resonance (3250 Hz) to the fundamental (2000 Hz) of the ejector. Testing of a novel model pulsed-ejector confirmed strong response for pulse frequencies less than half of the fundamental frequency of about 746 Hz. Acoustic driver frequency response limitations only allowed testing at less than the experimental fundamental frequency. Specifically pumping effectiveness was increased by up to five times, and even more in suction performance, for only 150 W electrical power at the acoustic driver input. Optimum performance was at a frequency of about 250 Hz, and the acoustic drive produced a small but significant increase in the flow stagnation pressure. The results demonstrate important research potential for the novel pulsed-ejector.

Copyright © 2002 by ASME

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