Investigation of hydrogen blending effects on turbulent methane flame properties using PDF-Monte Carlo method and FGM chemistry tabulation approach

This In this work, a computational investigation of the impacts of hydrogen blending on the fundamental properties of spherical propagating methane-air flames was performed in an adiabatic constant vessel at different conditions of equivalence ratios and turbulence intensities. Due to the spherically symmetric of the problem, a one-dimensional simulation was considered and an ignition in the middle of the domain was occurred. The turbulence was supposed to be isotropic and homogenous. The combustion chemistry was described by the tabulated detailed kinetic mechanism GRIMech. Tabulation has been performed, in a pre-processing step, using the Chem1D code based on the FGM chemistry tabulation approach. Numerical simulations of the flame evolutions were based on PDF-Monte Carlo method. The emphasis is placed on the mean flame radii, flame brush thickness, turbulent propagating velocity and the minimum ignition energy. Computed results were compared to measured data in literature and good agreements were observed. We notice that the mean flame radii, the flame brush thickness and the flame speed increase monotonically with the increase of the content of hydrogen in the fuel. However, the minimum ignition energy (MIE) decreases as the added hydrogen fraction increases.