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/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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December 2018
Research-Article
Fractal Characteristics of Combustion Noise
Aditya Saurabh,
Aditya Saurabh
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: aditya.saurabh@outlook.de
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: aditya.saurabh@outlook.de
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Hassan Imran,
Hassan Imran
School of Mechanical, Aerospace
and Civil Engineering,
University of Manchester,
Manchester M13 9PL, UK
and Civil Engineering,
University of Manchester,
Manchester M13 9PL, UK
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Holger Nawroth,
Holger Nawroth
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
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Christian Oliver Paschereit,
Christian Oliver Paschereit
Professor
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: oliver.paschereit@tu-berlin.de
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: oliver.paschereit@tu-berlin.de
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Lipika Kabiraj
Lipika Kabiraj
Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: lipika.kabiraj@iitrpr.ac.in
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: lipika.kabiraj@iitrpr.ac.in
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Aditya Saurabh
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: aditya.saurabh@outlook.de
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: aditya.saurabh@outlook.de
Hassan Imran
School of Mechanical, Aerospace
and Civil Engineering,
University of Manchester,
Manchester M13 9PL, UK
and Civil Engineering,
University of Manchester,
Manchester M13 9PL, UK
Holger Nawroth
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
Christian Oliver Paschereit
Professor
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: oliver.paschereit@tu-berlin.de
Chair of Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: oliver.paschereit@tu-berlin.de
Lipika Kabiraj
Fluid Dynamics,
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: lipika.kabiraj@iitrpr.ac.in
Hermann-Föttinger-Institut,
Technische Universität Berlin,
Berlin 10623, Germany
e-mail: lipika.kabiraj@iitrpr.ac.in
1Corresponding author.
2Present address: Department of Mechanical Engineering, Indian Institute of Technology Ropar, Rupnagar, India
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 5, 2017; final manuscript received October 19, 2017; published online August 30, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Dec 2018, 140(12): 121507 (7 pages)
Published Online: August 30, 2018
Article history
Received:
September 5, 2017
Revised:
October 19, 2017
Citation
Saurabh, A., Imran, H., Nawroth, H., Paschereit, C. O., and Kabiraj, L. (August 30, 2018). "Fractal Characteristics of Combustion Noise." ASME. J. Eng. Gas Turbines Power. December 2018; 140(12): 121507. https://doi.org/10.1115/1.4038766
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