Fractal Characteristics of Combustion Noise
Fractal Characteristics of Combustion Noise
复制标题
燃烧噪声的分形特征
DOI:
10.1115/1.4038766
复制
发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Kabiraj
中科院分区:
文献类型:
--
作者:
Saurabh;Nawroth;Paschereit;Kabiraj
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 anticorrelated structure with a Hurst exponent less than 0.5. The anticorrelated 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/f2noise. 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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DOI:
10.1016/s0082-0784(89)80061-x
发表时间:
1989
期刊:
Physics Procedia
影响因子:
--
作者:
F. Gouldin;S. M. Hilton;T. Lamb
通讯作者:
T. Lamb
影响因子:
2.4
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T. Sattelmayer
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1.9
作者:
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E. Siggia
影响因子:
2.5
作者:
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J. Handley