In this study hydrogen flames have been attempted in a rapidly mixed tubular flame combustor for the first time, in which fuel and oxidizer are individually and tangentially injected into a cylindrical combustor to avoid flame flash back. Three different cases were designed to examine the effects of fuel and oxidizer feeding method, diluent property, oxygen content and equivalence ratio on the characteristics of hydrogen flame, including the flame structure, lean extinction limit, flame stability and temperature. The results show that by enhancing mixing rate through feeding system, the range of equivalence ratio for steady tubular flame can be much expanded for the N₂ diluted mixture, however, at the oxygen content of 0.21 (hydrogen/air) the steady tubular flame is achieved only up to equivalence ratio of 0.5; by decreasing oxygen content, the lean extinction limit slightly increases, and the upper limit for steady tubular flame establishment increases significantly, resulting in an expanded tubular flame range. For CO₂ diluted mixture, the stoichiometric combustion has been achieved within oxygen content of 0.1 and 0.25, for which the burned gas temperature is uniformly distributed inside the flame front; as oxygen content is below 0.21, a steady tubular flame can be obtained from the lean to rich limits; and the lean extinction limit increases from 0.17 to 0.4 as oxygen content decreases from 0.21 to 0.1, resulting in a shrunk tubular flame range. Laminar burning velocity, temperature and Damköhler number are calculated to examine the differences between N₂ and CO₂ diluted combustion as well as the requirement for hydrogen-fueled tubular flame establishment.

在这项研究中，首次在快速混合的管状火焰燃烧器中尝试了氢火焰，其中燃料和氧化剂分别和切向地喷射到圆柱形燃烧器中，以避免火焰回燃。设计了三种不同的情况，以研究燃料和氧化剂的进料方式，稀释剂性能，氧含量和当量比对氢火焰特性的影响，包括火焰结构，稀薄消光极限，火焰稳定性和温度。结果表明，通过提高进料系统的混合速率，对于N ₂，稳定管状火焰的当量比范围可以大大扩大。但是，稀释后的混合物在氧气含量为0.21（氢/空气）时，只能达到当量比为0.5时，才能形成稳定的管状火焰。通过降低氧气含量，稀薄的消光极限会略有增加，稳定的管状火焰建立的上限会显着增加，从而扩大了管状火焰的范围。对于CO ₂稀释后的混合物，在氧气含量为0.1和0.25的范围内实现了化学计量的燃烧，燃烧气体的温度均匀地分布在火焰前部。当氧气含量低于0.21时，可以从稀薄到浓密的范围内获得稳定的管状火焰。随着氧气含量从0.21降至0.1，稀薄消光极限从0.17升高至0.4，导致管状火焰范围缩小。计算层流燃烧速度，温度和Damköhler数，以检查N ₂和CO ₂稀释燃烧之间的差异，以及建立氢燃料的管状火焰的要求。