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.
Fractal Characteristics of Combustion Noise
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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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