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In designing advanced combustion systems with methane fuel toward reducing the pollutants and improving the thermal efficiency, the laminar burning velocities under wider range of pressure and temperature than ever are indispensable. Measurements under adiabatic processes were conducted using a spherical combustion bomb equipped with heaters which can raise the initial premixed gases up to 700 K, and therefore obtained were the results which should cover the operation condition for the most up-to-date industrial combustion facilities. From the analytical examination of the results, an equation for laminar burning velocities was proposed in terms of a product of equivalence ratio dependent distribution function in addition to ordinary pressure and temperature exponent terms, where the exponents were -0.32 for the pressure and 2.33 for the temperature. The value of the pressure exponent seems smaller than that reported elsewhere, typically -0.5, which is presumed to be due to the behavior of the pressure dependence on the relation between adiabatic flame temperatures and equivalence rations.

Laminar Burning Velocities for Methane/Air under High Pressure and High Temperature Conditions