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Driving and damping mechanisms for transverse combustion instabilities in liquid rocket engines

Urbano, Annafederica and Selle, Laurent Driving and damping mechanisms for transverse combustion instabilities in liquid rocket engines. (2017) Journal of Fluid Mechanics, 820. 820 R2/1-820 R2/12. ISSN 0022-1120

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Official URL: http://dx.doi.org/10.1017/jfm.2017.227

Abstract

This work presents the analysis of a transverse combustion instability in a reduced-scale rocket engine. The study is conducted on a time-resolved database of three-dimensional fields obtained via large-eddy simulation. The physical mechanisms involved in the response of the coaxial hydrogen/oxygen flames are discussed through the analysis of the Rayleigh term in the disturbance-energy equation. The interaction between acoustics and vorticity, also explicit in the disturbance-energy balance, is shown to be the main damping mechanism for this instability. The relative contributions of Rayleigh and damping terms, depending on the position of the flame with respect to the acoustic field, are discussed. The results give new insight into the phenomenology of transverse combustion instabilities. Finally, the applicability of spectral analysis on the nonlinear Rayleigh and dissipation terms is discussed.

Item Type:Article
Additional Information:Thanks to Cambridge University Press editor. The definitive version is available at https://www.cambridge.org/ The original PDF of the article can be found at https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/driving-and-damping-mechanisms-for-transverse-combustion-instabilities-in-liquid-rocket-engines/D6067E12A9B9BD6DEAAE6D73900369EC
HAL Id:hal-01548611
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)
Laboratory name:
Funders:
Airbus Safran Launchers - IDRIS - European Research Council
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Deposited By: Annafederica URBANO
Deposited On:27 Jun 2017 15:16

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