We carried out the numerical simulation of methane-oxygen coaxial turbulent nonpremixed flames and of non-combusting flows at high pressures. The main objectives of this research were to assess the potential of several turbulence models and combustion models for their abilities to predict the characteristics of high pressure combustion. Four combinations of numerical models were studied: (1) a PDF model with k-ε model, (2) a flamelet model with k-ε model, (3) a PDF model with Reynolds stress model (RSM), and (4) a flamelet model with RSM. Comparison of the numerical results with measurement data under high pressure conditions revealed: (a) good agreement of the k-ε model for corresponding cold jets with increasing pressure; (b) a greater effect of the k-ε model and RSM on flow field characteristics than combustion models at high pressure; (c) good predictions, with the exception of turbulent energy, with the RSM/PDF model.
