Numerical Studies of Turbulent Jet Hydrogen/Air Diffusion Flames with Local Quenching Using Stiff Complex Chemistry

A turbulent hydrogen/air jet diffusion flame is numerically studied using a finite volume method. The chemical reactions are described by 9 species and 16 pairs of elementary steps. The stiff source terms of multi-species equations are treated semi-implicitly in order to get a stable simulation solution. The physical transport and thermodynamic properties for each species and gas mixture are obtained from the CHEMKIN-II database. The k - Ɛ turbulence model is used to account for the turbulence field. The mean temperature and major species (H2, O2, H2O, N2) are investigated and compared with experimental measurements of Barlow et al (1994). The overall agreement is reasonable between the predictions and experiment. The local quenching phenomena in the near-field are well captured and are found to be caused by the lift-off of the flame.

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