平行平板間を伝播する水素／空気予混合気の着火挙動

抄録

This study aims to clarify the dependence of the quenching distance of a hydrogen/air premixture on the flow velocity. The flow has the effect of pushing the flame kernel in the gap of the parallel plates downstream and it leads reducing heat loss. On the other hand, the effect of confining the flame kernel between the parallel plates due to circulating vortices on the wake side, and it leads increasing heat loss. Therefore, the flow velocity dependence of the quenching distance is reversed depending on whether the premixed gas flow velocity is larger or smaller than the burning velocity. The relationship between the dimensionless quenching distance d_qu/d_q0 and the dimensionless flame propagation velocity S_b /(S_b + u) also holds for hydrogen/air premixtures in the region where the burning velocity is small (φ < 0.31).