双组分燃料的层流火焰速度模型

以往关于层流火焰速度的理论分析均只考虑单组分燃料,本文对双组分燃料的平面火焰进行了大活化能渐近理论分析。在理论分析中,将火焰结构分为预热区、化学反应区和平衡区,并在大活化能假设下对各个区域分别求解了关于温度与燃料质量分数的微分方程。根据每两个区域分界面上满足的结合条件,本文推导出了双组分燃料的层流火焰速度模型。该模型表明双组分燃料层流火焰速度的平方为各个单组分燃料层流火焰速度平方的加权平均。

A Model for the Laminar Flame Speed of Binary Fuel Blends

In previous theoretical analysis on the laminar flame speed,a single fuel component was considered.In this study,large activation energy asymptotic analysis is conducted for a planar premixed flame of binary fuel blends.In the asymptotic analysis,the flame structure consists of the preheat zone,reaction zone,and equilibrium zone.Under the assumption of large activation energy, the temperature and fuel mass fraction distributions can be analytically solved in these three zones. Using the matching conditions at the surface between two neighboring zones,we derive a model for the laminar flame speeds of binary fuel blends.The model shows that the laminar flame speed of binary fuel blends depends on the square of the laminar flame speeds of the individual fuel constituents.