论文部分内容阅读
针对氢气添加的LPG(液化石油气)+空气预混火焰结构进行了数值研究,详细计算了在含氢比a为0%到45%、稀释引子D为21%到16%条件下的自由蔓延火焰,得到了不同燃烧条件(!=0.7-1.4)下的绝热燃烧速率变化规律.由于LPG中的主要成分为丙烷和丁烷,作者针对C3和C4物质提出了详细化学反应动力学系统,并针对氢气添加的丁烷燃烧过程进行了数值计算,得到了与实验相一致的结果,验证了改进的详细化学机理的有效性.此外,进一步计算了对撞双火焰的加氢LPG火焰,更加深入地探讨了火焰拉伸对燃烧稳定性和温度的影响,重点研究了!在0.5到0.7的稀薄燃烧,验证了氢气添加可以有效提高稀薄燃烧条件下熄火拉伸率,扩大稀薄燃烧的极限,增加火焰的稳定性.
A numerical study on the LPG (LPG) + air premixed flame structure with addition of hydrogen was carried out. The free propagation was calculated in detail with a hydrogen content a of 0% to 45% and a dilution index of 21% to 16% Flame, the change of adiabatic combustion rate under different combustion conditions (= 0.7-1.4) was obtained.Due to the main components of LPG being propane and butane, the author proposed a detailed chemical reaction kinetics system for C3 and C4 materials and The combustion process of butane added with hydrogen was numerically calculated and the results consistent with the experimental results were obtained and the effectiveness of the improved detailed chemical mechanism was verified. In addition, the hydrogenated LPG flame colliding with double flames was further calculated The effects of flame stretching on combustion stability and temperature were discussed. The lean combustion at 0.5 to 0.7 was studied. It was verified that the addition of hydrogen can effectively increase the flame-out rate under lean burn conditions, increase the limit of lean burn and increase Flame stability.