火焰拉伸率对层流燃烧速度的影响

将层流火焰消耗速度的概念与反应进程变量(progress variable)的定义相结合,给出了积分层流燃烧速度的广义定义.在准一维稳态系统中,分析了积分层流燃烧速度与未燃气体位移速度和已燃气体位移速度之间的关系.对甲烷空气和丙烷空气拉伸层流预混火焰在常温常压下进行了数值计算,研究不同当量比时,火焰拉伸率对层流燃烧速度的影响.通过火焰前锋放热率的积分层流燃烧速度和燃料消耗率的积分层流燃烧速度进行比较,结果表明,低拉伸火焰的马克斯坦数(Markstein number)与渐进分析一致,也与球形火焰获得的实验数据吻合.

Strain rate effects on the integral burning velocity of laminar premixed flames

The definition of the consumption speed for a laminar premixed flame was extended into an integral laminar burning velocity associated with a particular definition of the reaction progress variable.The integral laminar burning velocity,and particularly its relationship to the displacement speed at the unburnt and burnt sides,were analysed for a one-dimensional quasi-steady system.Numerical calculations were also carried out in counterflow geometry for methane-air and propane-air premixed flames at atmospher...