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RESEARCH PAPERS: Gas Turbines: Combustion and Fuels

Combustion Oscillation Control by Cyclic Fuel Injection

[+] Author and Article Information
G. A. Richards, M. J. Yip

U. S. Department of Energy, Morgantown Energy Technology Center, Morgantown, WV 26505

E. Robey

EG&G Technical Services of West Virginia, Morgantown Energy Technology Center, Morgantown, WV 26505

L. Cowell, D. Rawlins

Solar Turbines, Inc., San Diego, CA

J. Eng. Gas Turbines Power 119(2), 340-343 (Apr 01, 1997) (4 pages) doi:10.1115/1.2815580 History: Received February 27, 1995; Online November 19, 2007

Abstract

A number of recent articles have demonstrated the use of active control to mitigate the effects of combustion instability in afterburner and dump combustor applications. In these applications, cyclic injection of small quantities of control fuel has been proposed to counteract the periodic heat release that contributes to undesired pressure oscillations. This same technique may also be useful to mitigate oscillations in gas turbine combustors, especially in test rig combustors characterized by acoustic modes that do not exist in the final engine configuration. To address this issue, the present paper reports on active control of a subscale, atmospheric pressure nozzle/combustor arrangement. The fuel is natural gas. Cyclic injection of 14 percent control fuel in a premix fuel nozzle is shown to reduce oscillating pressure amplitude by a factor of 0.30 (i.e., −10 dB) at 300 Hz. Measurement of the oscillating heat release is also reported.

Copyright © 1997 by The American Society of Mechanical Engineers
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