Abstract:
A comprehensive numerical and experimental study of NO$_x$ formation during hydrogen combustion in a cylindrical combustor with a developed microflame burner is performed. Experimental data are obtained for various distributions of the fuel between the baseline and pilot contours of the burner. Numerical investigations of the combustion and NO$_x$ formation processes in the combustor are performed for regimes corresponding to numerical studies. The computations are performed in a steady-state formulation with the use of the Reynolds-averaged Navier–Stokes equations for turbulence modeling. In hydrogen combustion simulations, the rate of fuel mixing with air is taken into account by using a similarity criterion related to diffusion (turbulent Schmidt number). The normal velocity of flame propagation is specified in accordance with the temperature and composition of the fuel-air mixture. The influence of the turbulent Schmidt number on the results calculated for nitrogen oxide emissions is studied.
