作　　者： ; ; ; ; ; ;

机构地区： 西安交通大学能源与动力工程学院动力工程多相流国家重点实验室

出　　处： 《燃烧科学与技术》 2009年第4期374-380,共7页

摘　　要： 使用定容燃烧弹研究了不同初始压力下天然气-氢气-空气混合气的火焰传播规律,得到了初始压力、掺氢比和燃空当量比对无拉伸层流燃烧速率、质量燃烧流量的影响,结合高速纹影图片分析了影响火焰稳定性的因素(马克斯坦长度、火焰面两侧密度比和火焰厚度).结果表明,掺氢天然气无拉伸层流燃烧速率以及火焰的不稳定性受掺氢比、初始压力和燃空当量比的综合影响.结合高速纹影图片,得出火焰的稳定性会随初始压力的增加而减小;在相同的燃空当量比和掺氢比下,初始压力对密度比的影响不大,但是对火焰厚度的影响比较明显. Flame propagation of natural gas-hydrogen-air mixture tinder various initial pressures was studied in a constant volume combustion bomb using a high-speed schlieren photography system. Laminar burning velocities and mass burning fluxes were obtained at various initial pressures, hydrogen fractions and equivalence ratios. Flame stability and the influencing factors （Markstein length, density ratios and flame thickness） were also analyzed using the flame images at various hydrogen fractions, initial pressures and equivalence ratios. The results show that hydrogen fractions, initial pressures and equivalence ratios have combined influence on both an-stretched laminar bunting velocity and flame instability. According to the flame propagation pictures taken by high-speed camera, flame stability decreases with the increase of initial pressure. For mixtures with a fixed equivalence ratio and hydrogen fraction, variation of initial pressure has less influence on density ratio than on flame thickness.

关 键 词： 天然气 氢气 层流燃烧速率 初始压力 稳定性 定容燃烧弹

领　　域： [动力工程及工程热物理] [动力工程及工程热物理]