初始温度/压力对天然气层流燃烧速率的影响  

Effect of Initial Temperature/Pressure on Laminar Burning Velocity of Natural Gas

作　　者：常铭[1] 苗海燕[1] 路林[1] 刘岩[1] 黄佐华[1] 蒋德明[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,西安710049

出　　处：《燃烧科学与技术》2010年第4期309-316,共8页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(50606029)

摘　　要：在定容燃烧弹内利用高速纹影摄像法研究了不同初始温度和初始压力下不同当量比的天然气-空气混合气的火焰传播过程,并结合火焰传播照片分析了初始压力和初始温度对混合气层流燃烧速率的影响.研究表明,天然气-空气混合气的无拉伸火焰传播速率和无拉伸层流燃烧速率随当量比的增加先增大后减小,且最大值出现在化学当量比附近.火焰传播速率和层流燃烧速率均随着初始压力的升高而降低,随着初始温度的升高而提高.The laminar combustion processes of natural gas-air mixtures with various equivalence ratios under different initial pressures and initial temperatures were studied in a constant volume combustion bomb using schlieren photography. Both unstretched flame speed and unstretched laminar burning velocity were obtained by analyzing flame photos. The ex- perimental results show that unstretched flame speed and unstretched flame burning velocity increase first and then decrease with the increase of equivalence ratio, reaching the maximum value around stoichiometric ratio. Both unstretched flame speed and unstretched laminar burning velocity decrease with the increase of initial pressure, while they increase with the increase of initial temperature.

关 键 词：定容燃烧弹 天然气 层流燃烧速率 初始温度 初始压力 

分 类 号：TK16[动力工程及工程热物理—热能工程]