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Flame Quenching at Walls: A Source of Sound Generation

Ghani, Abdulla and Poinsot, Thierry Flame Quenching at Walls: A Source of Sound Generation. (2017) Flow Turbulence and Combustion, 99 (1). 173-184. ISSN 1386-6184

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Official URL: http://dx.doi.org/10.1007/s10494-017-9810-5

Abstract

This paper presents a numerical study of head on quenching (HOQ) (an extreme case of flame/wall interactions) as a source of sound generation, which in turn can trigger combustion instabilities and enhanced noise levels. High-fidelity numerical simulations are performed to investigate the impact of wall temperature, high chamber pressures and Lewis number of the fuel on the noise generation. It is demonstrated by theory and simulations that the underlying mechanism of sound generation is flame surface destruction (flame annihila- tion). Special emphasis is put on chemical modeling where simple and complex mechanisms were compared: it is shown that simple chemistry simulations overestimate the generated pressure peaks due to a too fast extinction of the heat release rate compared to the complex scheme. In contrast to the simple mechanism, the complex scheme accounts for minor and intermediate species production and destruction which slows down the extinction process and thus lead to a lower sound level. This effect has to be taken into account, especially in the context of Large Eddy Simulation (LES) of combustion instabilities and combustion noise where simple chemical descriptions are often employed.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at https://link.springer.com/ The original PDF of the article can be found at https://link.springer.com/article/10.1007/s10494-017-9810-5
HAL Id:hal-01548373
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)
Other partners > Technische Universität München - TUM (GERMANY)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Funders:
European Research Council - IDRIS
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Deposited By: Thierry POINSOT
Deposited On:27 Jun 2017 12:46

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