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Optimizing the Performance of Air-Air Ejectors With Triangular Tabbed Driving Nozzles

[+] Author Affiliations
S. F. McBean, A. M. Birk

Queen’s University, Kingston, ON, Canada

Paper No. GT2007-27413, pp. 1-10; 10 pages
doi:10.1115/GT2007-27413
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 6: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4795-0 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

This paper describes an experimental investigation into optimizing the performance of air-air ejectors with triangular tabbed driving nozzles. Mixing tabs have been shown to improve ejector performance, but at the cost of increased back-pressure. Ejector performance was evaluated on the basis of pumping, mixing, and back-pressure. It was discovered that mixing-tube inlet treatment influenced the ability of ejectors to entrain ambient air. It was also found that although mixing improved as a function of increased mixingtube length, maximum pumping occurred when the mixing-tube was approximately four nozzle diameters in length. Lastly, for a given overall ejector length, increased standoff was found to be more beneficial than increased mixing-tube length. Optimal ejector geometry was defined by the configuration that generated maximum mixing and maximum pumping for minimal increases in back-pressure.

Copyright © 2007 by ASME
Topics: Ejectors , Nozzles

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