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煤油 氢双燃料的超声速燃烧室中的自点火和燃烧稳定特性在直联式试验装置上进行了实验研究。实验空气总温 1 650～ 1 980K ,总压基本保持在 1 .8MPa左右 ,燃烧室进口M数为 2 .5。用激光粒度仪测量了在加压下煤油的雾化程度。为了寻找能点燃并维持煤油稳定燃烧的最低氢当量比 ,设计加工了四种不同构型引导火焰与凹稳焰一体腔结构 ,利用氢引导火焰局部地加速煤油的化学反应和凹腔的联合促进作用与优化结合 ,发现在没有强迫点火能源条件下点燃并维持煤油稳定燃烧的最低氢当量比能降低至 0 .0 3。燃烧室的性能用简化的一维计算机程序SSC - 3作了初步估算。在长度 42 5mm的燃烧室中获得了煤油的燃烧效率 50 %。引导火焰凹腔一体化结构对点火特性和性能的影响作了讨论
The self-ignition and combustion stability characteristics of the kerosene-hydrogen dual-fuel supersonic combustor have been experimentally investigated in a direct-coupled test set. Experimental air total temperature of 1 650 ~ 1 980K, the total pressure remained at about 1. 8MPa, the combustion chamber inlet M number of 2.5. The degree of atomization of kerosene under pressure was measured using a laser particle sizer. In order to search for the lowest hydrogen equivalent ratio that can ignite and maintain the stable combustion of kerosene, four different configurations of integrated flame and concave and steady flame chamber structure were designed and processed. Hydrogen-induced flame locally accelerated the chemical reaction of kerosene and the joint promotion of cavities In combination with optimization, it was found that the minimum hydrogen equivalent ratio for igniting and maintaining a stable combustion of kerosene without any source of forced ignition energy was reduced to 0.3. The performance of the combustion chamber was initially estimated using the simplified one-dimensional computer program SSC-3. The combustion efficiency of kerosene was 50% obtained in a combustion chamber of 42 mm in length. The effects of the integrated flame cavity structure on ignition characteristics and performance are discussed