COMPUTATIONAL FLUID DYNAMICS MODELING TOWARD CLEAN COMBUSTION

A turbulent hydrogen-air nonpremixed jet flame is studied using three-dimensional large eddy simulation (LES) and laminar flamelet model based on detailed chemical kinetics. The LES solves the governing equations on a structured Cartesian grid using a finite volume method, with turbulence and combustion modelling based on the localised dynamic Smagorinsky model and the steady laminar flamelet model respectively. The LES results are validated against experimental measurements and overall the LES yields good qualitative and quantitative agreement with the experimental observations. Analysis showed that the LES gives good prediction of the flow field, flame temperature and major species. The three-dimensional transient LES demonstrates the variation of low and high temperature structures and both transient and mean predictions show that the high temperature regions and combustion product appear close to the jet centreline. The present findings provide useful details on fundamental issues of turbulence-chemistry interactions of hydrogen combustion and help to identify potential pathways for combustion modelling towards clean combustion.