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 annihilation). 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.
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Acknowledgments
The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement ERC-AdG 319067-INTECOCIS. This work was granted access to the high-performance computing resources of IDRIS under the allocation x20162b7036 made by GENCI. Cerfacs is greatly acknowledged for their support on the AVBP code. A.G. would like to thank O. Schulz, Dr. P. Xavier and Dr. C. Kraus for fruitful discussions.
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Ghani, A., Poinsot, T. Flame Quenching at Walls: A Source of Sound Generation. Flow Turbulence Combust 99, 173–184 (2017). https://doi.org/10.1007/s10494-017-9810-5
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DOI: https://doi.org/10.1007/s10494-017-9810-5