Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Active Control of Pressure Oscillations in a Liquid-Fueled Sector Combustor

[+] Author and Article Information
J. M. Cohen, A. Banaszuk, J. R. Hibshman, T. J. Anderson, H. A. Alholm

 United Technologies Research Center, East Hartford, CT 06108

J. Eng. Gas Turbines Power 130(5), 051502 (Jun 13, 2008) (8 pages) doi:10.1115/1.2901177 History: Received July 16, 2007; Revised August 15, 2007; Published June 13, 2008

A system for the active control of combustor pressure oscillations in liquid-fueled, lean, premixed combustors was demonstrated in a three-nozzle sector combustor, using full-scale engine hardware. Modulation of a portion of the premixed fuel flow led to a reduction of 6.5 dB (2.1 times) in the amplitude of the dominant pressure oscillations mode. Combustor emissions were not adversely affected by the control.

Copyright © 2008 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 11

Multiple-nozzle, closed-loop actuation led to relatively small incremental reductions in pressure fluctuation levels, due to “peak-splitting” phenomenon

Grahic Jump Location
Figure 12

Bode plot of combustor pressure over valve command signal, no control, equivalence ratio of 0.44

Grahic Jump Location
Figure 10

Effect of controller phase on combustor pressure fluctuation levels for single-nozzle actuation

Grahic Jump Location
Figure 9

Combustor pressure power spectra illustrating the ability of the control system to both amplify and attenuate the pressure oscillations (single-nozzle actuation)

Grahic Jump Location
Figure 8

Actuation authority increases linearly with the number of fuel nozzles actuated, provided the actuation is well coordinated

Grahic Jump Location
Figure 7

Effect of single-nozzle open-loop forcing at 100Hz on combustor pressure spectrum

Grahic Jump Location
Figure 6

Power-spectrum density plots of uncontrolled optical emissions (heat release rate) at two equivalence ratios, ϕ, showing shift in frequency and amplitude of the dominant mode similar to that seen in the pressure data

Grahic Jump Location
Figure 5

Power-spectrum density plots of uncontrolled combustor pressure fluctuations at two equivalence ratios, ϕ, showing shift in amplitude and frequency of the dominant mode with equivalence ratio

Grahic Jump Location
Figure 4

Dependence of combustor pressure fluctuation levels on the primary-zone equivalence ratio

Grahic Jump Location
Figure 3

Dependence of NOx and CO concentrations at combustor exit on the primary-zone equivalence ratio

Grahic Jump Location
Figure 2

Schematic of steady-state and controlled fuel systems in the sector combustor test facility

Grahic Jump Location
Figure 1

Cross section of sector combustor test facility with instrumentation and actuation system

Grahic Jump Location
Figure 13

Distribution of 20,000 samples of uncontrolled unsteady combustor pressure (x) and a fit with a Gaussian distribution (○)

Grahic Jump Location
Figure 14

Schematic of closed-loop combustor simulation block diagram

Grahic Jump Location
Figure 15

Second-order model of combustor with delay reproduces peak-splitting phenomenon (Fig. 1) in closed-loop simulation

Grahic Jump Location
Figure 16

Model of the closed-loop combustor with the on-off valve characteristic simulated with its random-input describing function

Grahic Jump Location
Figure 17

Nyquist diagram for single-nozzle closed-loop control near the optimum control phase, showing that the controller excited secondary peaks (“B” and “C”) and attenuated the primary peak (“A”)



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In