This work presents results from experiments on direct combustion noise emitted from an unconfined, turbulent, premixed jet flame. It focuses on the influence of the shear layer and the turbulent fluctuations within this layer on the resulting noise emissions. Orifice discs of different diameter are used to change the shear layer width of the emanating jet. Using these discs, which induce and increase blockage upstream of the reaction zone, leads to significantly higher turbulent fluctuations of the velocity and subsequently to wider shear layers. As these fluctuations in the shear layer are the origin of direct combustion noise, the sound pressure levels of reacting flows increase as well. Moreover, the experiments also show the impact of the Reynolds number and equivalence ratio on noise emissions when using these discs. In general, wider shear layers yield higher sound pressure levels of the resulting combustion noise. Although amplitudes of the resulting noise emissions might differ for different conditions, the normalized sound spectra coincide proving that turbulent velocity fluctuations only govern the sound pressure levels but do not affect the shape of the resulting spectra if the geometry and fuel remain the same.
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ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5085-5
PROCEEDINGS PAPER
Experimental Investigation of the Influence of the Shear Layer on Direct Combustion Noise of a Turbulent Jet Flame Available to Purchase
Holger Nawroth,
Holger Nawroth
Technische Universität Berlin, Berlin, Germany
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Christian Oliver Paschereit
Christian Oliver Paschereit
Technische Universität Berlin, Berlin, Germany
Search for other works by this author on:
Holger Nawroth
Technische Universität Berlin, Berlin, Germany
Christian Oliver Paschereit
Technische Universität Berlin, Berlin, Germany
Paper No:
GT2017-64467, V04BT04A019; 12 pages
Published Online:
August 17, 2017
Citation
Nawroth, H, & Paschereit, CO. "Experimental Investigation of the Influence of the Shear Layer on Direct Combustion Noise of a Turbulent Jet Flame." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 4B: Combustion, Fuels and Emissions. Charlotte, North Carolina, USA. June 26–30, 2017. V04BT04A019. ASME. https://doi.org/10.1115/GT2017-64467
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