Inlet conditions for direct numerical simulations of turbulent premixed jet flames

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Abstract

Methane-air turbulent premixed planar jet flames are simulated using direct numerical simulations. A fluctuating velocity field at the jet inflow boundary is generated based on a prescribed turbulent energy spectrum. The peak wavenumber in the energy spectrum is determined from the turbulent integral length scale and turbulent kinetic energy at the jet inlet. The model also gives the instantaneous distributions of the gas temperature, species concentrations, and vorticity. The results show that coherent structures in the shear layer gradually appear as the eddy sizes increase. The chemical reactions are affected by the turbulence and the instantaneous reaction surface is quite wrinkled with its area increase. The turbulent kinetic energy gradually decreases, while the root mean squares of the temperature and methane concentration fluctuations increase along the jet centerline.

Keywords turbulent planar jet flame premixed flame direct numerical simulation inlet condition fluctuating velocity

Issue Date: 15 June 2014

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	Shaohua WU
	Jian ZHANG

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Shaohua WU,Jian ZHANG. Inlet conditions for direct numerical simulations of turbulent premixed jet flames[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(6): 834-838.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I6/834

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