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Open AccessJournal ArticleDOI

Complex system approach to investigate and mitigate thermoacoustic instability in turbulent combustors

TLDR
In this article, the authors discuss various prognosis and mitigation strategies for thermo-acoustic instability based on complex system theory in turbulent combustors, where the authors view the thermoacoustic system in a turbulent combustor as a complex system and the dynamics exhibited by the system is perceived as emergent behaviors of this complex system.
Abstract
Thermoacoustic instability in turbulent combustors is a nonlinear phenomenon resulting from the interaction between acoustics, hydrodynamics, and the unsteady flame Over the years, there have been many attempts toward understanding, prognosis, and mitigation of thermoacoustic instabilities Traditionally, a linear framework has been used to study thermoacoustic instability In recent times, researchers have been focusing on the nonlinear dynamics related to the onset of thermoacoustic instability In this context, the thermoacoustic system in a turbulent combustor is viewed as a complex system, and the dynamics exhibited by the system is perceived as emergent behaviors of this complex system In this paper, we discuss these recent developments and their contributions toward the understanding of this complex phenomenon Furthermore, we discuss various prognosis and mitigation strategies for thermoacoustic instability based on complex system theory

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Citations
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Journal ArticleDOI

A review on turbulent and vortical flow analyses via complex networks

TL;DR: The present review can boost future network-based research on turbulent and vortical flows, promoting the establishment of complex networks as a widespread tool for turbulence analysis.
Journal ArticleDOI

Characterizing modal exponential growth behaviors of self-excited transverse and longitudinal thermoacoustic instabilities

Dan Zhao, +1 more
- 01 Feb 2022 - 
TL;DR: In this paper , the authors proposed a model to predict the modal growth rate of a combustor in the presence of transverse and longitudinal combustion instabilities by coupling the unsteady heat release model with traveling waves.
Journal ArticleDOI

Low order modelling of thermoacoustic instabilities and intermittency: Flame response delay and nonlinearity

TL;DR: In this article, a model of coupled acoustic oscillators subject to delayed nonlinear source term from the flame, with parametric and additive stochastic forcing, is proposed, which can serve as a basis for an effective estimation of the system's linear growth rate via output-only identification methods.
Journal ArticleDOI

Determination of single and double helical structures in a swirling jet by spectral proper orthogonal decomposition

TL;DR: In this article, the authors studied the coherent structures found in an annular swirling jet flow undergoing vortex breakdown with control parameters, the Reynolds number Re = 8500 and the swirl number Sw = 0.38.
References
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Multifractal Detrended Fluctuation Analysis of Nonstationary Time Series

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