Flame Curvature Distribution in High Pressure Turbulent Bunsen Premixed Flames |
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Authors: | M. Klein H. Nachtigal M. Hansinger M. Pfitzner N. Chakraborty |
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Affiliation: | 1.Department of Aerospace Engineering,Universit?t der Bundeswehr München,Neubiberg,Germany;2.School of Mechanical & Systems Engineering,Newcastle University,Newcastle-Upon-Tyne,UK |
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Abstract: | The flame curvature statistics of turbulent premixed Bunsen flames have been analysed in this paper using a Direct Numerical Simulation (DNS) database of turbulent Bunsen flames at ambient and elevated pressures. In order to be able to perform a large parametric study in terms of pressure, heat release parameter, turbulence conditions and nozzle diameter, a single step Arrhenius type irreversible chemistry has been used for the purpose of computational economy, where thermo-chemical parameters are adjusted to match the behavior of stoichiometric methane-air flames. This analysis focuses on the characterization of the local flame geometry in response to turbulence and hydro-dynamic instability. The shape of the flame front is found to be consistent with existing experimental data. Although the Darrieus Landau instability promotes cusp formation, a qualitatively similar flame morphology can be observed for hydro-dynamically stable flames. A criterion has been suggested for the curvature PDF to become negatively skewed. |
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