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Multifractal characteristics of combustor dynamics close to lean blowout

Published online by Cambridge University Press:  29 October 2015

Vishnu R. Unni  and
R. I. Sujith
Vishnu R. Unni*
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai-600036, India
R. I. Sujith
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai-600036, India
*
†Email address for correspondence: [email protected]
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Abstract

In classical literature, blowout is described as loss of static stability of the combustion system whereas thermoacoustic instability is seen as loss of dynamic stability of the system. At blowout, the system transitions from a stable reacting state to a non-reacting state, indicating loss of static stability of the reaction. However, this simple description of stability margin is inadequate since recent studies have shown that combustors exhibit complex nonlinear behaviour prior to blowout. Recently, it was shown that combustion noise that characterizes the regime of stable operation is itself dynamically complex and exhibits multifractal characteristics. Researchers have already described the transition from combustion noise to combustion instability as a loss of multifractality. In this work, we provide a multifractal description for lean blowout in combustors with turbulent flow and thus introduce a unified framework within which both thermoacoustic instability and blowout can be described. Further, we introduce a method for predicting blowout based on the multifractal description of blowout.

JFM classification

Nonlinear Dynamical Systems: Fractals Nonlinear Dynamical Systems: Nonlinear Dynamical Systems Reacting Flows: Turbulent reacting flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 784 , 10 December 2015 , pp. 30 - 50
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Copyright
© 2015 Cambridge University Press 

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