Direct numerical simulation of flame/spontaneous ignition interaction fueled with hydrogen under SACI engine conditions

摘要: In spark assisted homogeneous charge compression ignition (SACI) engines a premixed flame is first established; the propagating results in heating of end gas and finally auto-ignition gas. Two dimensional direct numerical simulation (2D DNS) one (1D) detailed simulations flame/spontaneous interaction lean hydrogen/air mixture under constant volume enclosure relevant to SACI engine conditions are performed using chemistry transport properties. 2D outward spherical flame, thermal-diffusive instability observed once starts low temperature region preheat zone formed. Subsequently, suppressed. Then 1D flame/ignition interactions H2/air, syngas/air methane/air mixtures studied simulations. The reveal that due preferential diffusion hydrogen, heat mass transfer inhibits process, yielding slower reaction rate hence an even lower region. It shown further not affected by domain size step but it will disappear at very initial conditions. This absence