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Prediction and control of combustion instabilities in real engines

Poinsot, Thierry Prediction and control of combustion instabilities in real engines. (2017) Proceedings of the Combustion Institute, 36 (1). 1-28. ISSN 1540-7489

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Official URL: http://dx.doi.org/10.1016/j.proci.2016.05.007

Abstract

This paper presents recent progress in the field of thermoacoustic combustion instabilities in propulsion engines such as rockets or gas turbines. Combustion instabilities have been studied for more than a century in simple laminar configurations as well as in laboratory-scale turbulent flames. These instabilities are also encountered in real engines but new mechanisms appear in these systems because of obvious differences with academic burners: larger Reynolds numbers, higher pressures and power densities, multiple inlet systems, complex fuels. Other differences are more subtle: real engines often feature specific unstable modes such as azimuthal instabilities in gas turbines or transverse modes in rocket chambers. Hydrodynamic instability modes can also differ as well as the combustion regimes, which can require very different simulation models. The integration of chambers in real engines implies that compressor and turbine impedances control instabilities directly so that the determination of the impedances of turbomachinery elements becomes a key issue. Gathering experimental data on combustion instabilities is difficult in real engines and Large Eddy Simulation (LES) has become a major tool in this field. Recent examples, however, show that LES is not sufficient and that theory, even in these complex systems, plays a major role to understand both experimental and LES results and to identify mitigation techniques.

Item Type:Article
Additional Information:Thanks to Elsevier Editor. The definitive version of this document is available at: http://dx.doi.org/10.1016/j.proci.2016.05.007
HAL Id:hal-01502419
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Stanford University (USA)
Laboratory name:
Funders:
European Research Council - European Union’s Seventh Framework Programme (FP/2007-2013) - ERC grant agreement ERC-AdG 319067-INTECOCIS
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Deposited By: Thierry POINSOT
Deposited On:05 Apr 2017 13:10

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