numerical investigation of minimum ignition energy of ch4/air mixtures at higher pressures

Evaluating the impact of ignition energy on combustion characteristics during flame inception and its subsequent propagation is pivotal for enhancing both engine performance and thermal efficiency. this study paves way in achieving lower operating temperatures, mitigating nox emissions, and attaining precise control over diverse fuel blends and equivalence ratios (ϕ). a number of studies, experimental as well as numerical were devoted to atmospheric conditions. there are only a few numerical studies on the influence of pressure on minimum ignition energy (mie). in the current study, we the well-known arrhenius equation k=ae^(-e_a/rt) is adopted to understand the evolution of flames, with k the rate constant, a the exponential factor (5.2 × 1016), r is the universal gas constant (8.314 j/mol·k) and t signifies the activation temperature, 14906 k [1, 2]. here, cubical domain with a spherical volumetric heat source q, j/m3 is designed using a reactingfoam solver. the transport equation employed a first-order discretisation scheme known as ‘localeuler‘ to discretise the time term. the flame was initiated within a radius of 0.5 mm in a cubical domain size 75 mm, in one direction, by systematically varying q for methane/air stoichiometric mixtures at 300 k, for three pressures, 1, 5 and 10 bar. the results show a correlation that higher pressures require lower ignition energy and lead to a more rapid onset of flame evolution, pointing to temperature, and species concentrations.