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Experimental sensitivity analysis and control of thermoacoustic systems

Published online by Cambridge University Press:  16 December 2015

Georgios Rigas ,
Nicholas P. Jamieson ,
Larry K. B. Li  and
Matthew P. Juniper
Georgios Rigas*
Affiliation:
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
Nicholas P. Jamieson
Affiliation:
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
Larry K. B. Li
Affiliation:
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Matthew P. Juniper
Affiliation:
Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK
*
†Email address for correspondence: gr379@cam.ac.uk
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Abstract

In this paper, we report the results of an experimental sensitivity analysis on a thermoacoustic system – an electrically heated Rijke tube. We measure the change of the linear stability characteristics of the system, quantified as shifts in the growth rate and oscillation frequency, that is caused by the introduction of a passive control device. The control device is a mesh, which causes drag in the system. The rate of growth is slow, so the growth rate and frequency can be measured very accurately over many hundreds of cycles in the linear regime with and without control. These measurements agree qualitatively well with the theoretical predictions from adjoint-based methods of Magri & Juniper (J. Fluid Mech., vol. 719, 2013, pp. 183–202). This agreement supports the use of adjoint methods for the development and implementation of control strategies for more complex thermoacoustic systems.

JFM classification

Acoustics: Acoustics Flow Control: Flow Control Flow Control: Instability control
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 787 , 25 January 2016 , R1
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Copyright
© 2015 Cambridge University Press 

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