Fractal Characteristics of Combustion Noise

Fractal Characteristics of Combustion Noise
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燃烧噪声的分形特征

DOI:
10.1115/1.4038766
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发表时间:
2018
期刊:
Journal of Engineering for Gas Turbines and Power
影响因子:
--
通讯作者:
Kabiraj
Kabiraj
中科院分区:
--
文献类型:
--
作者:
Saurabh;Nawroth;Paschereit;Kabiraj

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分形分析进行表征火焰表面波动的无约束湍流预混火焰和由此产生的远场声学波动。结果表明,燃烧噪声是单分形的,其特征是一个与噪声相关的结构,其赫斯特指数小于0.5。在小时间尺度的压力波动以及火焰表面波动中,确定了与燃烧相关的性质。此外,研究结果表明,火焰表面的波动是多重分形大的时间尺度。计算出的赫斯特指数显着增加的当量比和略有下降的雷诺数为调查的操作条件。燃烧噪声数据的赫斯特指数的变化进行了比较与合成波动的情况下,由线性组合的白色和1/f2噪声的研究。这些结果提供了一个更详细的表征的火焰表面波动的时间结构和由此产生的噪声排放湍流预混火焰比目前已知的。
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.
DOI: 10.1016/s0082-0784(89)80061-x
发表时间: 1989
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