A constant-volume bomb and co-flow reactor investigation of ignition phenomenon of hydrocarbon fuels in high temperature oxidizer

The paper presents results of experimental studies on the methane and propane ignition process in various volumetric compositions of oxidizers heated to temperatures higher than the ignition point of analyzed fuels (HTAC conditions - High Temperature Air Combustion conditions). The increment of temperature ΔT and the ignition delay time τ' are parameters characterizing the process of ignition under these conditions. These parameters are the function of air excess ratio λ, temperature of the oxidizer toxi and the volumetric composition of oxidizer z_i. In order to achieve the minimum ignition delay time τ' and the maximum increment of the temperature ΔT, the oxidizer temperature need not be maximized. There is an interval of t_oxi in which the parameters mentioned above reach their extreme values.