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Matrix-free continuation of limit cycles and their bifurcations for a ducted premixed flame

Published online by Cambridge University Press:  17 October 2014

Iain C. Waugh
Affiliation:
Cambridge University, Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
K. Kashinath
Affiliation:
Cambridge University, Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
Matthew P. Juniper
Affiliation:
Cambridge University, Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
Corresponding
E-mail address:

Abstract

Many experimental studies have demonstrated that ducted premixed flames exhibit stable limit cycles in some regions of parameter space. Recent experiments have also shown that these (period-1) limit cycles subsequently bifurcate to period- $2^{n}$ , quasiperiodic, multiperiodic or chaotic behaviour. These secondary bifurcations cannot be found computationally using most existing frequency domain methods, because these methods assume that the velocity and pressure signals are harmonic. In an earlier study we have shown that matrix-free continuation methods can efficiently calculate the limit cycles of large thermoacoustic systems. This paper demonstrates that these continuation methods can also efficiently calculate the bifurcations from the limit cycles. Furthermore, once these bifurcations are found, it is then possible to isolate the coupled flame–acoustic motion that causes the qualitative change in behaviour. This information is vital for techniques that use selective damping to move bifurcations to more favourable locations in the parameter space. The matrix-free methods are demonstrated on a model of a ducted axisymmetric premixed flame, using a kinematic $G$ -equation solver. The methods find limit cycles and period-2 limit cycles, and fold, period-doubling and Neimark–Sacker bifurcations as a function of the location of the flame in the duct, and the aspect ratio of the steady flame.

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© 2014 Cambridge University Press 

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