Stochastic simulation of transport and chemical kinetics in turbulent CO/H2/N2 flames

Abstract

The one-dimensional turbulence (ODT) model is applied to the study of turbulent jet CO/H2/N2 flames. The ODT model retains the full range of length scales and no assumption of scale separation is required. In the present case, the ODT model describes the evolution of the entire flowfield; the ability of ODT to model the flowfield evolution is discussed. Predictions of the conditional means and fluctuations of temperature and the species mass fractions are compared with measurements and the level of closure required to address certain phenomena is discussed. The ODT model is shown to be useful for studying extinction/re-ignition phenomena and differential diffusion. The streamwise evolution in multidimensional flows is affected by dilatation in a manner not captured by the ODT model, and this results in discrepancies between the ODT mixing rates and the mixing rates evident in the measurements.