The drive to reduce emissions has led to the development of lean premixed combustors. However, lean premixed combustion is often associated with combustion oscillations which can be so severe that they can cause structural damage to the engine. Since the associated frequencies are typically of the order of hundreds of Hertz, there is a need for a compact device to absorb the noise which drives the oscillation. Helmholtz resonators are commonly used as absorbers of incident acoustic power. In addition they are relatively compact. However, their use in combustors creates practical issues, such as placement within the chamber, neck length, and cooling, which need to be addressed. In this paper we consider these practical problems and describe how to overcome them in a real combustor.
Issue Section:
Gas Turbines: Combustion and Fuel
1.
Bellucci, V., Flohr, P., Paschereit, C. O., and Magni, F., 2001, “On the use of Helmholtz Resonators fo Damping Acoustic Pulsations in Industrial Gas Turbines,” Technical Report 2001-GT-0039, ASME TURBO EXPO 2001, June 4–7, 2001, New Orleans, LA.
2.
Doria
, A.
, 2000
, “A Simple Method for the Analysis of Deep Cavity and Long Neck Acoustic Resonators
,” J. Sound Vib.
, 232
(4
), pp. 823
–833
.3.
Gysling
, D. L.
, Copeland
, G. S.
, McCormick
, D. C.
, and Prosnia
, W. M.
, 2000
, “Combustion System Damping Augmentation With Helmholtz Resonators
,” ASME J. Eng. Gas Turbines Power
, 122
, pp. 269
–274
.4.
Selamet
, A.
, Dickey
, N. S.
, and Novak
, J. M.
, 1995
, “Theoretical, Computational and Experimental Investigation of Helmholtz Resonators With Fixed Volume: Lumped Versus Distributed Analysis
,” J. Sound Vib.
, 187
(2
), pp. 358
–367
.5.
Selamet
, A.
, Radavich
, P. M.
, Dickey
, N. S.
, and Novak
, J. M.
, 1997
, “Circular Concentric Helmholtz Resonators
,” J. Acoust. Soc. Am.
, 101
(1
), pp. 41
–51
.6.
Walker
, B. E.
, and Charwat
, A. F.
, 1982
, “Correlation of the Effects of Grazing Flow on the Impedance of Helmholtz Resonators
,” J. Acoust. Soc. Am.
, 72
(2
), pp. 550
–555
.7.
Cummings
, A.
, 1984
, “Acoustic Nonlinearities and Power Losses at Orifices
,” AIAA J.
, 22
, pp. 786
–792
.8.
Dowling, A. P., and Ffowcs Williams, J. E., 1983, Sound and Sources of Sound, Ellis Horwood, Chichester, UK.
9.
Howe
, M. S.
, 1979
, “On the Theory of Unsteady High Reynolds Number Flow Through a Circular Aperture
,” Proc. R. Soc. London, Ser. A
, 366
, pp. 205
–223
.10.
Howe
, M. S.
, 1996
, “The Influence of Tangential Mean Flow on the Rayleigh Conductivity of an Aperture
,” Proc. R. Soc. London, Ser. A
, 452
, pp. 2303
–2317
.11.
Chanaud
, R. C.
, 1994
, “Effects of Geometry on the Resonance Frequency of Helmholtz Resonators
,” J. Sound Vib.
, 178
(3
), pp. 337
–348
.12.
Chanaud
, R. C.
, 1997
, “Effects of Geometry on the Resonance Frequency of Helmholtz Resonators. Part ii
,” J. Sound Vib.
, 204
(5
), pp. 829
–834
.13.
Jungowski
, W. M.
, and Grabitz
, G.
, 1987
, “Self-Sustained Oscillation of a Jet Impinging Upon a Helmholtz Resonator
,” J. Fluid Mech.
, 179
, pp. 77
–103
.14.
Khosropour
, R.
, and Millet
, P.
, 1990
, “Excitation of a Helmholtz Resonator by an Air Jet
,” J. Acoust. Soc. Am.
, 88
(3
), pp. 1211
–1221
.15.
Meissner
, M.
, 1987
, “Self-Sustained Deep Cavity Oscillations Induced by Grazing Flow
,” Acustica
, 62
, pp. 220
–228
.16.
Nelson
, P. A.
, Halliwell
, N. A.
, and Doak
, P. E.
, 1981
, “Fluid Dynamics of a Flow Excited Resonance. Part I: Experiment
,” J. Sound Vib.
, 78
(1
), pp. 15
–38
.17.
Nelson
, P. A.
, Halliwell
, N. A.
, and Doak
, P. E.
, 1983
, “Fluid Dynamics of a Flow Excited Resonance. Part II: Flow Acoustic Interaction
,” J. Sound Vib.
, 91
(3
), pp. 375
–402
.18.
Dupe`re, I. D. J., and Dowling, A. P., 2002, “The Absorption of Sound by Helmholtz Resonators With and Without Flow,” Technical Report 2002–2590, 8th AIAA/CEAS Aeroacoustics Conference, June 17–19, 2002, Breckenridge, CO.
19.
Seybert
, A. F.
, and Ross
, D. F.
, 1977
, “Experimental Determination of Acoustic Properties Using a Two Microphone Random Excitation Technique
,” J. Acoust. Soc. Am.
, 61
, pp. 1362
–1370
.Copyright © 2005
by ASME
You do not currently have access to this content.
