Journal article

Frequency domain and time domain analysis of thermoacoustic oscillations with wave-based acoustics

A Orchini, SJ Illingworth, MP Juniper

Journal of Fluid Mechanics | Cambridge University Press (CUP): STM Journals | Published : 2015

Abstract

Many thermoacoustic systems exhibit rich nonlinear behaviour. Recent studies show that this nonlinear dynamics can be well captured by low-order time domain models that couple a level set kinematic model for a laminar flame, the G-equation, with a state-space realization of the linearized acoustic equations. However, so far the G-equation has been coupled only with straight ducts with uniform mean acoustic properties, which is a simplistic configuration. In this study, we incorporate a wave-based model of the acoustic network, containing area and temperature variations and frequency-dependent boundary conditions. We cast the linear acoustics into state-space form using a different approach f..

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University of Melbourne Researchers

Grants

Awarded by European Research Council


Awarded by Engineering and Physical Sciences Research Council


Funding Acknowledgements

The authors would like to thank Dr K. Kashinath and Dr I. C. Waugh for comments and support on this paper. This project was funded by the European Research Council through Project ALORS 2590620.