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Analysis of Combustor Acoustic Resonances Using an Efficient Transient Solver

[+] Author Affiliations
Klaus Brun, Harold R. Simmons, Marybeth G. Nored

Southwest Research Institute® , San Antonio, TX

Rainer Kurz

Solar Turbines, Inc., San Diego, CA

Paper No. GT2007-27035, pp. 1399-1405; 7 pages
doi:10.1115/GT2007-27035
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 4: Turbo Expo 2007, Parts A and B
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4793-4 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

To reduce combustion induced dynamic vibrations, a thorough understanding of a combustor’s acoustic characteristics at all operational conditions is imperative. Acoustic methods that rely on the solution of the wave equation are not adequate to accurately predict acoustic resonance in any real combustor with thermal gradient and velocities. Also, solutions of the 3-D transient Navier-Stokes equations are impractical, even with today’s fast computers. A method is described herein that utilizes an efficient one-dimensional transient Euler solver to determine all acoustic resonance frequencies of a combustor at a given operating condition. Area changes, viscous losses, local temperatures, and open/closed wall-boundaries are modeled with a two-equation model. The analysis method was utilized to determine the dynamic pressures of a 20 MW industrial gas turbine’s combustor. Results compared favorably to field testing results of the same gas turbine.

Copyright © 2007 by ASME

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