B307 Flame Propagation of Inhomogeneous Feel-Air Mixture with Swirl in a Constant-Volume Vessel(Turbulent flame-2) :

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The fundamental flame propagation and combustion characteristics of a stratified fuel-air mixture are investigated. Swirling turbulent flow with a rich fuel-air concentration is generated in a constant volume cylindrical vessel. The fuel concentration distribution and swirling flow field at the timing of the spark are measured using LIF and LDV, respectively. The mixture is ignited at the center of the vessel. Two main conclusions are drawn from this work. First, the strongly swirling flow with gas injection at the center generates successive inhomogeneous fuel concentrations. Various gradient and equivalence ratios in the vicinity of the spark location are obtained by changing the period between gas injection and ignition. Under a stratified charge condition, with an appropriate mixture near the spark location, the flame can propagate and combustion occurs, even with an ultra lean fuel-air mixture. Second, the stratified mixture with a stoichiometric mixture in the vicinity of the spark location propagates more rapidly than the homogeneous case with the same overall equivalence ratio. Both a higher rate of pressure rise and a shorter ignition delay time were achieved.

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