Counterflow diffusion flame of methane and methane/hydrogen mixed fuel in supersonic flow

Counterflow diffusion names of methane and methane/hydrogen mixed fuel, developed in the forward stagnation-now region of a porous cylinder in supersonic flow, are analysed numerically by solving the two-dimensional compressible Navier-Stokes equations for multispecies. In the case of methane single fuel, an appreciable strong reaction zone or a name cannot be established in Mach 3 airflow for any air static temperature under 1100 K, and the maximum temperature coincides with the stagnation temperature of airflow. When hydrogen with high reactivity and high diffusivity is added to methane, a strong reaction zone clearly appears and the name temperature increases more than the stagnation temperature of airflow because of the heat released by the chemical reaction. However, the name temperature has a maximum around the mixing ratio of 20% hydrogen, and then the flame temperature and mole fractions of the reaction products for mixed fuel decreases with an increase of the mixing ratio of hydrogen.