富氢/富氧燃气同轴气-气喷嘴燃烧性能仿真与分析

为研究全流量补燃循环发动机富氢/富氧燃气气-气喷嘴性能,以758 K的富氢燃气为燃料、676 K的富氧燃气为氧化剂,对采用同轴直流喷嘴、氧喷嘴扩张同轴喷嘴、氢喷嘴收缩同轴喷嘴、氧喷嘴中心具有实心圆柱同轴喷嘴、双同轴直流喷嘴的燃烧室的燃烧流场进行了数值模拟,并考察了流量对燃烧性能的影响.仿真结果表明双同轴直流喷嘴具有最好的燃烧性能.数值模拟结果对富氢/富氧燃气气-气喷注器设计有参考价值.

Simulation and analysis on combustion performance of hydrogen-rich/oxygen-rich gas-gas coaxial injectors

In order to investigate the performance of the hydrogen-rich/oxygen-rich gas-gas injector in the full flow staged combustion (FFSC) engine, the combustion flow field of a shear coaxial injector, a coaxial injector of the oxidizer injector with expansion angle, a coaxial injector of the fuel injector with contraction angle, a coaxial injector of the oxidizer injector with a column in the center and a shear tri-coaxial injector were simulated. The propellant of the injectors was hydrogen-rich gas in temperature of 758K and oxygen-rich gas in temperature of 676K. The results of the numerical simulation show that the shear tri-coaxial injector has the best combustion performance. The results can provide the reliable criterion for the design and experiment of hydrogen-rich/oxygen-rich gas-gas injector.