Multifractal characteristics of combustor dynamics close to lean blowout

Unni, Vishnu R. ; Sujith, R. I. (2015) Multifractal characteristics of combustor dynamics close to lean blowout Journal of Fluid Mechanics, 784 . pp. 30-50. ISSN 0022-1120

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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.

Item Type:Article
Source:Copyright of this article belongs to Cambridge University Press.
Keywords:Fractals; Nonlinear Dynamical Systems; Turbulent Reacting Flows
ID Code:109932
Deposited On:21 Dec 2017 11:03
Last Modified:21 Dec 2017 11:03

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