Abstract
The paper presents computational results of a turbulent non-premixed flame with large extinction, using the large eddy simulation probability density function methodology. The simulation captures local flame extinction at different flame locations, and major species predictions show good agreement with experimental data. A chemical explosive mode analysis is used to determine the flame structure including the explosive modes and the Damköhler number distribution. Due to the nature of the turbulence combustion model, statistical information on the sub-grid flame structure is available: such as sub-grid explosive modes. The analysis suggests that, in the present flame, sub-grid structures are only relevant close to the inlet nozzle, and that downstream extinction is governed by large-scale interactions.
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