期刊
FLOW TURBULENCE AND COMBUSTION
卷 101, 期 4, 页码 1173-1187出版社
SPRINGER
DOI: 10.1007/s10494-018-9951-1
关键词
Direct numerical simulation; Turbulent premixed combustion; Flame curvature; Bunsen flame
资金
- Gauss Centre for Supercomputing/Leibniz Supercomputing Centre [pr74ra]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/K025163/1, EP/P022286/1]
- EPSRC [EP/I028013/1, EP/G008841/2, EP/P022286/1, EP/K025163/1] Funding Source: UKRI
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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