富氢/富氧燃气同轴剪切气-气喷嘴性能仿真分析

采用正交试验设计方法对富氢/富氧燃气同轴剪切气-气喷嘴设计参数氧压降比、燃氧速度比、氧喷嘴出口壁厚进行组合,数值模拟单喷嘴燃烧室燃烧流场,研究喷嘴设计参数及参数之间的交互作用对燃烧性能和燃烧室热载性能的影响,评价指标为燃烧长度、燃烧室壁面平均燃气温度和喷注面板平均燃气温度.仿真结果表明,燃氧速度比对燃烧与热载有显著影响,氧压降比与氢氧燃氧速度比的交互作用影响明显,分析结果对气-气喷嘴试验设计有重要指导意义. 

Performance simulation analysis for a hydrogen-rich / oxygen-rich shear coaxial gas-gas injector

Based on orthogonal experiment design method,the design parameters of a hydrogen-rich/oxygen-rich shear coaxial gas-gas injector,including the ratio of the oxidizer pressure drop to the combustor pressure(D_p),the ratio of the fuel velocity to the oxidizer velocity(R_v),and the oxidizer post tip wall thickness(W_o),were combined.The flow field of the single injector combustor was simulated.The influences of the injector design parameters and the interaction of the parameters on the combustion performance and heat load performance were studied.Evaluation indexes include:combustion length (L_c),average gas temperature on combustion chamber wall (T_w) and average gas temperature on the injection faceplate (T_f).The results show that,the influence of R_v on the combustion performance and the heat load performance is remarkable.The influence of the interaction of D_p and R_v on the combustion performance and heat load is obvious.The results can provide reliable criterion for the gas-gas injector experiment design.