For turbulent swirl-stabilized flames combustion noise can be directly calculated, if density fluctuations as a function of time and space are known. It is however not easily possible to assess the density fluctuations directly. Therefore, in the past, combustion noise has been expressed as a function of chemiluminescence, an approach bringing in more assumptions. Now, by using interferometry, density fluctuations in the flame can be measured quantitatively. The advantage of this technique is that it measures the time derivative of density fluctuations directly. In this work laser interferometric vibrometry (LIV) was used to scan a two dimensional field in the flame in order to calculate the sound power emitted by the flame. Sound intensity was measured in a half-hemisphere by pressure-pressure-probes in order to record the total sound power of the direct combustion noise emitted by the unconfined flame. The goal of this study was to compare the measured sound power exhibited by the flame with the sound power predicted due to fluctuations of density within the flame. By using a siren to generate linear excitation, it was possible to qualitatively predict combustion noise with good agreement in trend. A quantitative comparison between both measurement techniques showed a deviation of a factor of six.
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ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4976-7
PROCEEDINGS PAPER
Analysis of Combustion Noise Using Locally Resolved Density Fluctuations and a Microphone Array
Johannes Peterleithner,
Johannes Peterleithner
Graz University of Technology, Graz, Austria
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Stefan Zerobin,
Stefan Zerobin
Graz University of Technology, Graz, Austria
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Jakob Woisetschläger
Jakob Woisetschläger
Graz University of Technology, Graz, Austria
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Johannes Peterleithner
Graz University of Technology, Graz, Austria
Stefan Zerobin
Graz University of Technology, Graz, Austria
Jakob Woisetschläger
Graz University of Technology, Graz, Austria
Paper No:
GT2016-57490, V04BT04A023; 11 pages
Published Online:
September 20, 2016
Citation
Peterleithner, J, Zerobin, S, & Woisetschläger, J. "Analysis of Combustion Noise Using Locally Resolved Density Fluctuations and a Microphone Array." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 4B: Combustion, Fuels and Emissions. Seoul, South Korea. June 13–17, 2016. V04BT04A023. ASME. https://doi.org/10.1115/GT2016-57490
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