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Numerical Simulation of Flame Propagation in a Staged Combustor

[+] Author Affiliations
Tomoko Tsuru, Akira Imamura, Yasuhiro Kinoshita, Yoshiharu Nonaka

Kawasaki Heavy Industries, Ltd., Akashi, Hyogo, Japan

Yuichi Itoh, Nobuyuki Taniguchi

University of Tokyo, Tokyo, Japan

Paper No. GT2002-30097, pp. 601-608; 8 pages
doi:10.1115/GT2002-30097
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

Highly unsteady flow fields are generated in recent low-emissions gas turbine combustors. Numerical simulation of such flows using conventional numerical code using a time-averaged turbulence model is difficult and time-accurate LES (Large Eddy Simulation) is expected to predict them. Calculation of turbulent combusting and non-combusting flow field in a staged combustor were conducted using LES. To validate the LES calculation, a prediction of time-averaged velocity field is compared with those by an experiment and a conventional numerical method based on RANS model. Turbulence intensity affects flame speed so much that velocity fluctuations were measured to obtain turbulence intensity in the non-combustion test. Strongly turbulent regions between the pilot and main stages, which are important for the flame propagation, were simulated. The combustion was calculated using a laminar flamelet model and the flame propagating phenomenon was simulated properly, which is impractical by the conventional simulations using time-averaged turbulence models. The feasibility of the LES calculation is discussed.

Copyright © 2002 by ASME

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