TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

Combustion System Damping Augmentation With Helmholtz Resonators

[+] Author and Article Information
D. L. Gysling, G. S. Copeland, D. C. McCormick, W. M. Proscia

United Technologies Research Center, 411 Silver Lane, MS 129-16, E. Hartford, CT 06108

J. Eng. Gas Turbines Power 122(2), 269-274 (Oct 20, 1999) (6 pages) doi:10.1115/1.483205 History: Received March 08, 1998; Revised October 20, 1999
Copyright © 2000 by ASME
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Schematic of combustor with side-branch resonator
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Rootlocus plots of system eigenvalues as Γ is increased from 0 percent to 20 percent. Combustor with one resonator, ζH=0.10. (a) Tuned resonator, Q=1. (b) Mistuned resonator, Q=0.95. (Γ=6.4, 7.7, 12.8 percent indicated by ○, ⋄, and ▵, respectively).
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Dependence of optimal resonator damping ratio on volume ratio for the tuned resonator. (a) Damping augmentation versus resonator damping for Γ=6.4, 7.7, and 12.8 percent. (b) Optimal damping ratio versus volume ratio.
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Dependence of damping augmentation on frequency ratio and damping ratio. (ΣΓ=5 percent). (a) Single resonator. Optimal ζH is 11 percent. (b) Two resonators, ζ12H1=1.1ωH2=0.9ωH. Optimal ζH is 7 percent. (c) Damping augmentation versus frequency ratio at optimal ζH for single resonator and two resonator configurations.
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Rootloci of eigenvalues as combustor damping (ζtc) is varied from 20 percent damping to 20 percent growth. Arrows indicate direction of decreasing stability. Resonator configurations identical to those of Fig. 4.
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Design intent of three resonator configurations
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Example of transfer function from combustor pressure to resonator pressure and the frequency domain curve fit used to identify resonator frequency and damping ratio
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Combustor pressure spectra for the baseline combustor without resonators and the same combustion system with three resonator configurations operating at two power levels.
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Damping augmentation predictions for the three resonator configuration presented in Table 1 for the combustion system operating at two power levels. Combustion system and sidebranch resonator parameters identified from experimental data.
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Effect of frequency robustness on pressure fluctuations in combustor. Data and system damping augmentation predicted by model.



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