Stretch Effects in Plane Premixed Hydrogen-Air Flames

摘要

A numerical analysis is performed of a plane premixed flame with detailed kinetics which is stretched by a diverging flow field. The numerical results are compared to the analytic result obtained from large activation energy asymptotics for one-step kinetics. A rich flame with a hydrogen mole fraction in the unburnt of X/sub H sub 2 / = 0.6 and a lean flame with X/sub H sub 2 / = 0.15 are considered. As predicted by the asymptotic theory, the mass flow rate through the flame is decreased due to stretch for the rich flame, while it is increased for the lean flame. Extinction occurs due to flame stretch for the rich and due to flame compression for the lean flame. (ERA citation 09:028974)