Heckl, MA and Surendran, A (2017) Passive instability control by a heat exchanger in a combustor with non-uniform temperature. International Journal of Spray and Combustion Dynamics. ISSN 1756-8285

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Abstract

Thermoacoustic instabilities, caused by the feedback between unsteady heat release and acoustic pressure perturbations, are characterised by large-amplitude pressure oscillations. These oscillations, if uncontrolled, pose a threat to the integrity of combustion systems. One strategy to mitigate them is by installing cavity-backed perforated plates with bias flow into the combustion chamber. In this study, we consider a generic combustor configuration: a one-dimentional tube (with open and/or closed ends) containing a compact heat source and a heat exchanger tube row. The idea is to use the heat exchanger tube row as a device (analogously to a cavity-backed perforated plate) to manipulate the downstream end condition. We simulate the row of heat exchanger tubes by a slit-plate with bias flow. We derive the characteristic equation for the complex eigenfrequencies of this set-up. From the growth rates (imaginary parts of the eigenfrequencies), we construct stability maps for various system parameter combinations. The results, obtained for the first two modes of the system, show that by varying the cavity length or the bias flow velocity through the slits, we can stabilise a previously unstable combustion system.

Item Type: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via Sage Publications at http://dx.doi.org/10.1177/1756827717695282 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: thermoacoustic instabilities, control of instability, stability analysis, heat exchangers, orifice plates
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Depositing User: Symplectic
Date Deposited: 21 Feb 2017 10:22
Last Modified: 26 May 2017 09:30
URI: http://eprints.keele.ac.uk/id/eprint/2838

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