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Effect of Pilot Flame on Flame Macrostructure and Combustion Instability

[+] Author Affiliations
Jihang Li, Stephen Peluso, Bryan Quay, Domenic Santavicca

Pennsylvania State University, University Park, PA

James Blust, Ram Srinivasan

Solar Turbines, San Diego, CA

Paper No. GT2017-64079, pp. V04AT04A064; 9 pages
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 4A: Combustion, Fuels and Emissions
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5084-8
  • Copyright © 2017 by Solar Turbines Incorporated


The effect of a pilot flame on the dynamic stability characteristics of a single-nozzle lean-premixed swirl combustor operating on natural gas fuel is investigated. Experiments are performed at a fixed inlet temperature and inlet velocity over a broad range of overall fuel-lean equivalence ratios with varied amounts of pilot fuel. The stability results are presented in the form of a dynamic stability map which is a three-dimensional graph of the normalized rms pressure fluctuation versus the overall equivalence ratio and percent pilot. The dynamic stability map identifies boundaries between stable and unstable combustion and results are presented characterizing the transition across one of these boundaries. Time-averaged two-dimensional chemiluminescence images of the stable flame and phase-averaged two-dimensional chemiluminescence images of the unstable flame are used to gain an understanding of the effect of the pilot on dynamic stability through changes in flame structure.

Copyright © 2017 by Solar Turbines Incorporated
Topics: Combustion , Flames



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