不同初始温度下甲烷-空气混合气层流燃烧速率的测定  

Measurement of Laminar Burning Velocity of Methane-Air Premixed Flame at Different Initial Temperatures

作　　者：何佳佳[1] 胡二江[1] 金春[1] 黄佐华[1] 汤成龙[1] 苗海燕[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《内燃机学报》2009年第6期487-492,共6页Transactions of Csice

基　　金：国家自然科学基金项目(50636040;50521604);国家重大基础研究计划项目(2007CB210006)

摘　　要：利用高速纹影系统在定容燃烧弹中用球形火焰法测量了不同当量比和不同初始温度下的甲烷-空气混合气的层流燃烧速率。研究结果表明:拉伸火焰传播速率、无拉伸火焰传播速率和无拉伸层流燃烧速率均随初始温度的增加而增加。Markstein长度值随燃空当量比的增加而增加,随初始温度的增加而略微减小。浓混合气的甲烷-空气前锋面火焰稳定性比稀混合气高。不同初始温度下的无拉伸层流燃烧速率在化学计量比处达到最大值。基于试验数据拟合出无拉伸层流燃烧速率与当量比和初始温度的经验公式。The laminar burning velocity of methane-air mixtures was measured under different initial temperatures and equivalence ratios by using the outwardly expanding flame and high-speed sehlieren photography. The results show that the stretched flame propagation speed, the unstretched flame propagation speed and the laminar burning velocity are increased with the increase of initial temperature. The Markstein length is increased with the increase of equivalence ratio, but it decreases slightly with the increase of initial temperature. Flame front of the rich premixed mixture combustion shows higher stability than that of the lean mixture combustion. The laminar burning velocities reach their maximum values at the stoichiometric equivalence ratio regardless of initial temperature. Based on the experimental data, an explicit expression for the laminar burning velocity to initial temperature and equivalence ratio is correlated.

关 键 词：甲烷 初始温度 层流燃烧速率 马克斯坦长度 

分 类 号：TK412[动力工程及工程热物理—动力机械及工程]