Evaluation of flamelet model and flamelet/progress-variable approach on DNS of two-dimensional diffusion jet flame

Abstract

Steady flamelet method, flamelet/progress-variable method and chemtables used for the methods are evaluated on DNS of two-dimensional diffusion jet flame by comparing with the direct approach. The results show that the steady flamelet methods with the chemtables considering the distribution of scalar dissipation rate in Z space are superior to those with chemtables not considering it. This is not conditioned by the solution, i.e. whether the governing equations are solved in the physical space or Z space. The accuracy is improved by flamelet/progress-variable method. Although product mass fraction has been used as the progress-variable for the flamelet/progress-variable method, it is found that enthalpy is preferable in terms of the accuracy and the application to complicated fields like a spray conbustion.