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Reheat buzz: an acoustically coupled combustion instability. Part 2. Theory

Published online by Cambridge University Press:  21 April 2006

G. J. Bloxsidge ,
A. P. Dowling  and
P. J. Langhorne
G. J. Bloxsidge
Affiliation:
British Maritime Technology, CEEMAID Division, St Johns Street, Hythe, Southampton SO4 6YS, UK
A. P. Dowling
Affiliation:
The University Engineering Department, Trumpington Street, Cambridge CB2 1PZ, UK
P. J. Langhorne
Affiliation:
Department of Physics, University of Otago, PO Box 56, Dunedin, New Zealand
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Abstract

Reheat buzz is a low-frequency instability of afterburners. It is caused by the interaction of longitudinal acoustic waves and unsteady combustion. Similar combustion instabilities occur in laboratory rigs. A theory is developed to determine the frequency and mode shape of the instability and is tested by comparison with the experimental results described in Part1. The predicted and measured frequencies are found to be within 6 Hz (7%) of each other. The theory is able to predict the observed variation of frequency with equivalence ratio, inlet Mach number and geometry.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 193 , August 1988 , pp. 445 - 473
Copyright
© 1988 Cambridge University Press

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