Abstract
End-gas compression by propagating flame in super-lean SI engines was simulated by a RCM to uncover the spontaneous ignition process of the end-gas in in-cylinder under highly turbulent conditions. Lean n-heptane-air mixture of 0.5 and 0.7 in equivalence ratio was employed. In-cylinder turbulence was generated by a perforated plate set in the cylinder, through which the mixture issues during compression stroke. The topology of OH* chemiluminescence on spontaneous ignition was observed by high-speed spectroscopic video imaging. As a result, it was found that, when end-gas temperature is raised at around the ignition delay peak in NTC where the delay is insensitive to temperature, the luminous combusting area expands rapidly on ignition and pressure oscillation occurs due to the resulting rapid pressure rise.
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