Evaluation of reaction progress variable - mixture fraction statistics in partially premixed flames

摘要: Abstract The mixture fraction and reaction progress variables are key for presumed probability density function (PDF) based flamelet models partially premixed flames. importance of the joint statistics these two evaluated using a composition-enthalpy transported PDF/Finite Volume method applied to established databases inhomogeneous jet accuracy approach is first examined three flames with different inlet profiles departures from blow-off. (joint-) variable subsequently analysed covariance used evaluate assumption statistical independence. Results show that current able reproduce near-field features both homogeneous latter leads stratified flame evolves diffusion-dominated combustion as influence pilot fades. In agreement measured data, variance strongly affected by mode misalignment obvious in flame. It shown influenced turbulence-chemistry interactions that, generally, parameters remain correlated consequence independence implausible.