Abstract
The influence of the intake generated charge motions on the initial flame behavior and flame propagation pattern was investigated. The initial flame kernel behavior was detected through a spark plug with fiber optic probes or ionization probes. The ionization probes located in a printed circuit board head gasket were also used to detect the flame propagation at the cylinder wall. These signals were processed to obtain the inferred flame shape and flame development. The changes in charge motion were investigated with the convection velocity, flame growth rate, and mass burn duration. The effect of injection timing on mixture distribution for the swirl port was also examined indirectly with the initial flame development measurement.