渦核内の高速火炎伝ぱ特性

抄録

Characteristics of flame propagation in a vortex core were experimentally investigated Using avortex ring generated by a jet of a mixture ejected through a circular nozzle. The ratio of increasein the flame speed to the maximum tangential velocity Vθmax decreases gradually with increasingVθmax. This is because the radius of curvature of the flame tip in the vortex core decreases withincreasing Vθmax. The flame speed increases with increasing ratio of the densities of the unburned gasto the burned gas(ρu/ρb) 1/2. This is because the radius of curvature of the flame tip increases withincreasing(ρu/ρb)1/2. The flame speed in the vortex core can be predicted well using the model offlame propagation in which the shape of the flame tip In the vortex core is considered.