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RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

Application of Active Combustion Instability Control to a Heavy Duty Gas Turbine

[+] Author and Article Information
J. R. Seume, N. Vortmeyer, W. Krause

Siemens Power Generation (KWU), 10553 Berlin, Germany

J. Hermann, C.-C. Hantschk, P. Zangl, S. Gleis, D. Vortmeyer

Lehrstuhl B. Fuer Thermodynamik, Technical University of Munich, Germany

A. Orthmann

pad Software, Haar-Salmdorf, Germany

J. Eng. Gas Turbines Power 120(4), 721-726 (Oct 01, 1998) (6 pages) doi:10.1115/1.2818459 History: Received July 01, 1997; Online November 19, 2007

Abstract

During the prototype shop tests, the Model V84.3A ring combustor gas turbine unexpectedly exhibited a noticeable “humming” caused by self-excited flame vibrations in the combustion chamber for certain operating conditions. The amplitudes of the pressure fluctuations in the combustor were unusually high when compared to the previous experience with silo combustor machines. As part of the optimization program, the humming was investigated and analyzed. To date, combustion instabilities in real, complex combustors cannot be predicted analytically during the design phase. Therefore, and as a preventive measure against future surprises by “humming,” a feedback system was developed which counteracts combustion instabilities by modulation of the fuel flow rate with rapid valves (active instability control, AIC). The AIC achieved a reduction of combustion-induced pressure amplitudes by 86 percent. The Combustion instability in the Model V84.3A gas turbine was eliminated by changes of the combustor design. Therefore, the AIC is not required for the operation of customer gas turbines.

Copyright © 1998 by The American Society of Mechanical Engineers
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