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Effect of the Flame Dome Depth and Improvement of the Pressure Loss in the Dump Diffuser FREE

[+] Author Affiliations
Shinji Honami, Takaaki Shizawa

The Science University of Tokyo, Tokyo, Japan

Wataru Tsuboi

Mitsubishi Heavy Industries, Ltd., Akunoura, Nagasaki, Japan

Paper No. 98-GT-225, pp. V003T06A012; 8 pages
doi:10.1115/98-GT-225
From:
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7864-4
  • Copyright © 1998 by ASME

abstract

This paper presents the effect of flame dome depth on the total pressure performance and flow behavior in a sudden expansion region of the combustor diffuser without flow entering the dome head. The mean velocity and turbulent Reynolds stress profiles in the sudden expansion region were measured by a Laser Doppler Velocitmetry (LDV) system. The experiments show that total pressure loss is increased, when flame dome depth is increased. Installation of an inclined combuster wall in the sudden expansion region is suggested from the viewpoint of a control of the reattaching flow. The inclined combustor wall is found to be effective in improvement of the diffuser performance. Better characteristics of the flow rate distribution into the branched channels are obtained in the inclined wall configuration, even if the distorted velocity profile is provided at the diffuser inlet.

Copyright © 1998 by ASME
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