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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

The Use of Helmholtz Resonators in a Practical Combustor

[+] Author and Article Information
Iain D. J. Dupère, Ann P. Dowling

Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom

J. Eng. Gas Turbines Power 127(2), 268-275 (Apr 15, 2005) (8 pages) doi:10.1115/1.1806838 History: Received October 01, 2002; Revised March 01, 2003; Online April 15, 2005
Copyright © 2005 by ASME
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References

Figures

Grahic Jump Location
An illustration of a real Helmholtz resonator attached to a pipe
Grahic Jump Location
Comparison between the measured and predicted absorption coefficient as a function of frequency for an incident sound pressure amplitude of 165 dB with a closed end. + experimental measurement, ——— theory.
Grahic Jump Location
Comparison between the measured and predicted absorption coefficient as a function of frequency for an incident sound pressure amplitude of 170 dB with an open end. + experimental measurements, ——— theory.
Grahic Jump Location
The predicted absorption coefficient as a function of frequency for a range of incident sound pressure amplitudes from 120 to 185 dB with increments of 5 dB. The lowest graph is for 120 dB.
Grahic Jump Location
The variation of acoustic absorption coefficient with frequency for a Helmholtz resonator with a sound pressure level at the neck opening of 155 dB and in the presence of a mean pipe flow Mach number of 0.04. ——— theory, ∘ ⋯ 145 dB, ×–⋅– 150 dB, + ——— – 155 dB.
Grahic Jump Location
A graph showing the variation of absorption coefficient with frequency for three different mean aperture velocities, for a practical Helmholtz resonator with a finite neck length
Grahic Jump Location
An illustration of a side-branch resonator with an arbitrary base attached to a pipe
Grahic Jump Location
Experimental rig used for high amplitude incident waves, with and without mean flow

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