Chemistry and Turbulence of Coal Reaction Products
In Chapter 11 we discussed the impact of the turbulence on the gas-phase chemistry with particular application to gaseous fuels. We also examined the problems in obtaining time-mean reaction rates for chemical reactions in the homogeneous phase. We limited our discussion to turbulent diffusion flames and noted three types of turbulence—chemistry interactions. The majority of Chapter 11 focused on Type B flames when the reaction time scale was much less than the turbulent time scale and thus the turbulence mixing process controlled the chemical reactions. All of Chapter 11 focused on gaseous fuels. An appropriate mixture fraction or conserved scalar was defined; the statistics of the turbulence were characterized by an appropriate probability density function; and the mean chemical properties were obtained by convolution over this PDF of either chemical equilibrium properties or experimental data.
KeywordsCoal Combustion Mixture Fraction Coal Particle Turbulent Fluctuation Progress Variable
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