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Performance of a Round Ejector With 22.5° Bent Entraining Diffuser

[+] Author Affiliations
Qi Chen

Atomic Energy of Canada Limited, Chalk River, ON, Canada

A. M. Birk

Queen’s University, Kingston, ON, Canada

Paper No. GT2010-22230, pp. 2745-2755; 11 pages
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 7: Turbomachinery, Parts A, B, and C
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4402-1 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME


This paper presents experimental data for the performance of a round ejector with a 22.5° bent entraining diffuser. The experiments were carried out on a hot gas wind tunnel that could provide primary mass flow rates up to 2.2 kg/s at ambient temperature and 1.8 kg/s at 500°C. Velocity, pressure and temperature were measured in the annulus upstream of the primary nozzle, on the mixing tube and diffuser walls, at the diffuser gap inlets and at the diffuser exit. The inlet flow swirl angle and flow temperature were varied to study their effect on ejector pumping, wall pressure, and wall temperature distribution. The data from bent ejectors were compared with similar data for a round straight ejector. The results showed that the 22.5° bent entraining ejector had better hot core cooling performance than the straight entraining ejector since the hot core was cooled by the tertiary flow more efficiently at the outer side of the bend.

Copyright © 2010 by ASME
Topics: Diffusers , Ejectors



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