CUED Publications database

Sensitivity and Nonlinearity of Thermoacoustic Oscillations

Juniper, MP and Sujith, RI Sensitivity and Nonlinearity of Thermoacoustic Oscillations. Annual Review of Fluid Mechanics, 50. (Unpublished)

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Nine decades of rocket engine and gas turbine development have shown that thermoacoustic oscillations are difficult to predict but can usually be eliminated with relatively small ad hoc design changes. These changes can, however, be ruinously expensive to devise. This review explains why linear and nonlinear thermoacoustic behaviour is so sensitive to parameters such as operating point, fuel composition, and injector geometry. It shows how non-periodic behaviour arises in experiments and simulations and discusses how fluctuations in thermoacoustic systems with turbulent reacting flow, which are usually filtered or averaged out as noise, can reveal useful information. Finally, it proposes tools to exploit this sensitivity in the future: adjoint-based sensitivity analysis to optimize passive control designs, and complex systems theory to warn of impending thermoacoustic oscillations and to identify the most sensitive elements of a thermoacoustic system.

Item Type: Article
Uncontrolled Keywords: acoustics flow control instability nonlinear dynamical systems reacting flows turbulent flows
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:12
Last Modified: 28 Sep 2017 01:43