Role of flame dynamics on the bifurcation characteristics of a ducted V-flame

Vishnu, R. ; Sujith, R. I. ; Aghalayam, Preeti (2015) Role of flame dynamics on the bifurcation characteristics of a ducted V-flame Combustion Science and Technology, 187 (6). pp. 894-905. ISSN 0010-2202

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Combustion instability is a nonlinear process with interaction between combustion and acoustics. The nonlinearity in the combustion process is observed in the flame dynamics. In our study of a ducted laminar premixed V-flame, we varied the distance between the flame anchor and the duct exit. We observed that the thermoacoustic system bifurcates from a stable state to a frequency locked state, followed by quasi-periodicity, period 3 oscillations, and finally chaotic oscillations. During the occurrence of these dynamical states, the role of flame dynamics is investigated using high speed imaging. We observed wrinkle formation, its propagation and growth along flame front, rollup of the flame, separation, and annihilation of flame elements during instability. From the present study it is found that each dynamical state is characterized by a particular sequence of flame behavior, highlighting the role of nonlinear flame dynamics in establishing the observed dynamical state.

Item Type:Article
Source:Copyright of this article belongs to Taylor & Francis Group.
Keywords:Chaos; Flame Dynamics; Frequency Locked; Period 3; Quasi-periodicity
ID Code:109935
Deposited On:21 Dec 2017 11:00
Last Modified:21 Dec 2017 11:00

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