Fractal analysis is undertaken to characterize flame surface fluctuations on an unconfined turbulent premixed flame and the resulting far-field acoustics fluctuations. Results indicate that combustion noise is monofractal and is characterized by an anti-correlated structure with a Hurst exponent less than 0.5. The anti-correlated nature was identified in the pressure fluctuations as well as flame surface fluctuations for small time scales. Additionally, results suggest that flame surface fluctuations are multifractal for large time scales. The calculated Hurst exponent increases noticeably with the equivalence ratio and decreases slightly with Reynolds number for the investigated operating conditions. Variation in the Hurst exponent for combustion noise data is compared with a case study of synthetic fluctuations comprised of linear combinations of white and 1/f2 noise. These results provide a more detailed characterization of the temporal structure of flame surface fluctuations and resulting noise emission from turbulent premixed flames than is presently known.
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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
Fractal Characteristics of Combustion Noise
Aditya Saurabh,
Aditya Saurabh
Technische Universität Berlin, Berlin, Germany
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Hassan Imran,
Hassan Imran
Technische Universität Berlin, Berlin, Germany
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Holger Nawroth,
Holger Nawroth
Technische Universität Berlin, Berlin, Germany
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Christian Oliver Paschereit,
Christian Oliver Paschereit
Technische Universität Berlin, Berlin, Germany
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Lipika Kabiraj
Lipika Kabiraj
Technische Universität Berlin, Berlin, Germany
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Aditya Saurabh
Technische Universität Berlin, Berlin, Germany
Hassan Imran
Technische Universität Berlin, Berlin, Germany
Holger Nawroth
Technische Universität Berlin, Berlin, Germany
Christian Oliver Paschereit
Technische Universität Berlin, Berlin, Germany
Lipika Kabiraj
Technische Universität Berlin, Berlin, Germany
Paper No:
GT2017-64985, V04BT04A060; 10 pages
Published Online:
August 17, 2017
Citation
Saurabh, A, Imran, H, Nawroth, H, Paschereit, CO, & Kabiraj, L. "Fractal Characteristics of Combustion Noise." 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. V04BT04A060. ASME. https://doi.org/10.1115/GT2017-64985
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