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Vortex-driven acoustically coupled combustion instabilities

Published online by Cambridge University Press:  21 April 2006

Thierry J. Poinsot,
Arnaud C. Trouve,
Denis P. Veynante,
Sebastien M. Candel and
Emile J. Esposito
Thierry J. Poinsot
Affiliation:
Laboratoire E.M2.C, CNRS et Ecole Centrale des Arts et Manufactures, Chatenay-Malabry, France
Arnaud C. Trouve
Affiliation:
Laboratoire E.M2.C, CNRS et Ecole Centrale des Arts et Manufactures, Chatenay-Malabry, France
Denis P. Veynante
Affiliation:
Laboratoire E.M2.C, CNRS et Ecole Centrale des Arts et Manufactures, Chatenay-Malabry, France
Sebastien M. Candel
Affiliation:
Laboratoire E.M2.C, CNRS et Ecole Centrale des Arts et Manufactures, Chatenay-Malabry, France
Emile J. Esposito
Affiliation:
Laboratoire E.M2.C, CNRS et Ecole Centrale des Arts et Manufactures, Chatenay-Malabry, France
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Abstract

Combustion instability is investigated in the case of a multiple inlet combustor with dump. It is shown that low-frequency instabilities are acoustically coupled and occur at the eigenfrequencies of the system. Using spark-schlieren and a special phase-average imaging of the C2-radical emission, the fluid-mechanical processes involved in a vortex-driven mode of instability are investigated. The phase-average images provide maps of the local non-steady heat release. From the data collected on the combustor the processes of vortex shedding, growth, interactions and burning are described. The phases between the pressure, velocity and heat-release fluctuations are determined. The implications of the global Rayleigh criterion are verified and a mechanism for low-frequency vortex-driven instabilities is proposed.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 177 , April 1987, pp. 265 - 292
Copyright
© 1987 Cambridge University Press

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