Numerical studies on minimum ignition energies in methane/air and iso-octane/air mixtures

In this study, the dependence of minimum ignition energies (MIE) on geometry, source radius and mixture composition is investigated numerically for methane/air iso-octane/air mixtures. Methane iso-octane are both important hydrocarbon fuels, but differ strongly with respect to their Lewis numbers. Lean air mixtures have particularly large The results show that within flammability limits, MIE stays almost constant, increases rapidly at limits. MIEs fuels also similar Furthermore, a small spherical increase lean Here number above unity, thus, flame may quench because curvature effects. observations distinct difference between propagation iso-octane. energy required initiating successful can be considerably higher than an in volume. For source, effect was observed all equivalence ratios. cylindrical sources, phenomenon appeared lower ratios only, where mixture's large. methane fuel, negligible. highlight significance molecular transport properties decision whether or not ignitable evolve into propagating flame.