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-dimens ional compressible Navier-Stokes equations for multispecies. In the ca se of methane single fuel, an appreciable strong reaction zone or a na me cannot be established in Mach 3 airflow for any air static temperat ure under 1100 K, and the maximum temperature coincides with the stagn ation temperature of airflow. When hydrogen with high reactivity and h igh diffusivity is added to methane, a strong reaction zone clearly ap pears and the name temperature increases more than the stagnation temp erature of airflow because of the heat released by the chemical reacti on. However, the name temperature has a maximum around the mixing rati o of 20% hydrogen, and then the flame temperature and mole fractions o f the reaction products for mixed fuel decreases with an increase of t he mixing ratio of hydrogen.