Abstract
A Reynolds Averaged Navier–Stokes (RANS) modelling of a non-premixed turbulent CH4/H2/N2 flame is considered. This turbulent flame is handled as an ensemble of laminar diffusion flamelets according to the laminar flamelet concept. The Favre-averaged governing equations of momentum, mass, and energy in the turbulent field were solved in conjunction with the standard k − ε turbulence model. The coupling between the chemistry and turbulence is achieved by a presumed Probability Density Function (presumed-PDF). The GRI Mech-3.0 mechanism that involves 53 species and 325 reactions is adopted. The comparison between the simulation results and the experimental data of velocity, temperature and mass fractions of species (CH4, H2, N2, H2O, CO2, O2 and CO) along the centreline as well as the radial position of x/D = 5, 40 are presented. The effect of the constant of the model k-ε ‘Cɛ1’ and the turbulent Schmidt number ‘Sct’ on the accuracy of the numerical solution is highlighted. The results show that the present approach remains an accurate promising alternative to the LES and DNS approaches for the modelling of the turbulent combustion process.
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The authors are grateful to Future Optimization Ideas Inc. for the financial support.
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Hafid, M., Hebbir, N., Lacroix, M. et al. Simulating of non-premixed turbulent combustion using a presumed probability density function method. Heat Mass Transfer 59, 81–93 (2023). https://doi.org/10.1007/s00231-022-03238-7
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DOI: https://doi.org/10.1007/s00231-022-03238-7