中文摘要：

在定容燃烧弹内研究了初始压力为0.1 MPa,初始温度为285 K下掺氢天然气-空气-稀释气体混合气的层流火焰传播过程,获得了在不同掺氢比、稀释度和当量比下的Markstein长度,并结合Markstein长度以及纹影图片分析了氮气稀释气和CO2稀释气对火焰稳定性的影响及其异同.研究结果表明.Markstein长度随着掺氢比的增加而减小.Markstein长度随稀释度的变化规律与掺氢天然气的掺氢比和当量比有关.CO2稀释气对火焰稳定性的影响较氮气更为显著.

英文摘要：

The laminar flame propagating process of natural gas-hydrogen-diluent gas-air was studied in a constant volume combustion bomb with the initial pressure of 0.1,MPa and the initial temperature of 285 K.Markstein lengths were obtained at various hydrogen fractions,diluent ratios and equivalence ratios.Effects of nitrogen and CO2 diluent gas on flame stability were analyzed separately and then compared based on the measured Markstein length and schlieren photos.The results show that Markstein length decreases with the increase of hydrogen fraction.Markstein length can either increase or decrease with the increase of diluent ratio,depending on hydrogen fraction and equiva-lence ratio.It is also found that CO2 has greater effect on flame stability than nitrogen.