A Comparative Evaluation of Turbulence Models for H2/N2 Combustion Using the Eulerian Transported PDF Approach

Abstract

The Eulerian method of transported PDF is an approach that is considered to be a derivative of the delta function. Among the strengths of this method are its ability to anticipate flame extinction and ignition, as well as its capacity to kinetically control chemical components such as CO and NO[Formula: see text]. The primary objective of this study is to utilize this method to conduct a comparative evaluation of two turbulence models: the [Formula: see text]-epsilon model and the RSM model. This numerical study aims to deepen our understanding of the combustion dynamics of an H2/N2 mixture within a turbulent diffusion flame. To achieve this, the mixture is injected into a co-flow of hot air, allowing for the simulation of real conditions. The selected mixture model is the Interaction by Exchange with the Mean (IEM). For the Eulerian approach, the number of environments is set to (2,0). In this study, the model was solved using the commercial CFD software, ANSYS Fluent, and the chemical reaction mechanism employed for H2 comprises of 37 reactions involving 13 distinct species. Results are validated with the experimental data and are discussed. The integration of the PDF approach with the RSM turbulence model appears to be a valuable strategy for a better understanding of H2 flow and combustion.