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research-article

Fractal characteristics of combustion noise

[+] Author and Article Information
Aditya Saurabh

Postdoctoral researcher, Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Germany 10623
aditya.saurabh@outlook.de

Hassan Imran

DAAD exchange student, School of Mechanical, Aerospace & Civil Eng., University of Manchester, UK
hassan.imran7777@gmail.com

Holger Nawroth

Research scientist, Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Germany 10623
h.nawroth@tu-berlin.de

Christian Oliver Paschereit

Professor, Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Germany 10623
oliver.paschereit@tu-berlin.de

Lipika Kabiraj

Project head, Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Germany 10623
lipika.kabiraj@iitrpr.ac.in

1Corresponding author.

ASME doi:10.1115/1.4038766 History: Received September 05, 2017; Revised October 19, 2017

Abstract

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 $1/f^2$ 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.

Copyright (c) 2017 by ASME
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