Abstract: In order to obtain the differences and connections of the GO₂/CH_4and GH₂/GO_2combustion characteristics, to provide experience of the GH₂/GO_2injector for guiding GO₂/CH_4injector design, comparison of GO₂/CH_4and GH₂/GO_2combustion characteristics for shear-coaxial injectors was conducted in the same combustion chamber by numerical simulation and experiment. The results show that under the similar design parameters, the size of GO₂/CH_4injector is almost equal to that of GH₂/GO_2injector. On condition that the pressure at design point and dimensions are the same,in order to produce the same thrust, the mass flow rate of GO₂/CH₄(mixture ratio 3.5)is about 1.27times as GH₂/GO₂(mixture ratio 6.0). Furthermore, combustion characteristic length of GO₂/CH₄ is approximately 1.48times as much as GH₂/GO_2combustion chamber, and the thermal load of the GO₂/CH_4combustion chamber is about half of the GH₂/GO_2combustion chamber.

Key words: GO₂/CH₄; GH₂/GO₂; Injector; Characteristic length; Thermal load

摘要： 为了获得气氧/甲烷与气氢/气氧两种推进剂组合燃烧特性的异同,将氢/氧气-气喷注器的设计经验用于气氧/甲烷气-气喷注器设计,在同一燃烧室中针对气氧/甲烷与气氢/气氧同轴剪切喷注器燃烧特性开展了数值仿真与试验研究。结果表明:在喷注器设计参数相似的情况下,气氧/甲烷喷注器尺寸与气氢/气氧喷注器尺寸相当；在相同的燃烧室设计压力、结构尺寸,以及两种推进剂组合均完全燃烧的情况下,要产生相同的推力,气氧/甲烷(混合比3.5)推进剂流量约为氢/氧(混合比6.0)推进剂流量的1.27倍, 气氧/甲烷燃烧所需燃烧室特征长度约为氢/氧燃烧室特征长度的1.48倍,气氧/甲烷燃烧室壁面热载约为氢/氧燃烧室壁面热载的一半。 

关键词: 气氧/甲烷;气氢/气氧;喷注器;特征长度;热载荷 