高温高压下掺氢天然气的燃烧特性  

Combustion Characteristics of Hydrogen-Enriched Natural Gas Under Elevated Temperature and Pressure

作　　者：常铭[1] 苗海燕[1] 刘岩[1] 路林[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,陕西西安710049

出　　处：《内燃机学报》2010年第6期481-487,共7页Transactions of Csice

基　　金：国家自然科学基金资助项目(50606029)

摘　　要：在定容燃烧弹内研究了高温(450,K)、高压(0.75,MPa)条件下天然气-氢气-空气混合气的火焰传播过程,获得了不同掺氢比和不同当量比下掺氢天然气的无拉伸层流燃烧速率,并分析了火焰的稳定性。结果表明,高温高压下随着掺氢比的增加,掺氢天然气的燃烧速率增加,且增长速率逐渐加快;马克斯坦长度则随着掺氢比的增加而减小,即火焰的稳定性下降。随着当量比的增加,无拉伸层流燃烧速率呈现先增大后减小的趋势,且最大无拉伸层流燃烧速率所对应当量比的位置随着掺氢比的提高而向浓混合气移动;马克斯坦长度随当量比的增加而增大,即火焰稳定性随当量比的增加而提高。Laminar flame characteristics of natural gas-hydrogen-air mixtures were studied in a constant volume combustion bomb at elevated temperature and pressure（T0=450,K,p0=0.75,MPa）.Unstretched laminar burning velocities of natural gas-hydrogen-air mixture with various hydrogen fractions at different equivalence ratios were obtained,and flame stability was analyzed.The results showed that at elevated initial condition,laminar burning velocity increases with the increase of hydrogen fraction,while Markstein length decreases with the increase of hydrogen fraction which decreases flame stability.The un-stretched laminar burning velocity give a peak value at certain equivalence ratio,and the corresponding equivalence ratio moves to the rich mixture direction with the increase of hydrogen fraction.Markstein length tends to increase with the increase of equivalence ratio at different hydrogen fractions,and this indicates the increase of flame stability with the increase of equivalence ratio.

关 键 词：天然气 氢气 层流燃烧速率 马克斯坦长度 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]