Numerical simulation of turbulent burning velocity of CH$_{\mathrm{4}}$/H$_{\mathrm{2}}$/air flame using LES/FGM approach

The turbulent burning velocity, $s_{T}$, of hydrogen/methane/air mixture is numerically investigated by large-eddy simulation (LES) with flamelet generated manifold (FGM) method of turbulent jet flow. Volume ratio of the hydrogen/methane in the mixture, $\alpha$ is varied from 0 to 0.6 for the ambient pressure range of $P=$0.1-0.9 MPa. Equivalence ratio of the mixture is fixed to be unity. The results show that the ratio of $s_{T}$ to laminar burning velocity $s_{L}$, $s_{T}$/$s_{L}$ increases with increasing $\alpha$ and $P$ This is considered to be due to the facts that $s_{L}$ decreases with increasing $P$, and that the flame thickness decreases with increasing $\alpha$ and $P$, which causes to increase the surface area of flame sheet.