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为进一步深入研究气-气喷注器结构参数对气-气掺混燃烧特性的影响,采用常温气氢和气氧推进剂,对同轴直流和同轴旋流气-气单喷嘴进行了冷流和热试试验,获得了每种喷注器的流量系数、燃烧室压力和燃烧室壁温,并结合数值仿真研究了中心气氧旋流强度对推进剂掺混燃烧的影响。结果表明:同轴旋流式喷嘴拥有较小的流量系数;中心气氧旋流有利于提高推进剂的燃烧效率,但带来了较大的燃烧室和喷注面板热载。
In order to further study the effect of the structural parameters of the gas-air injector on the combustion characteristics of the gas-air mixture, cold flow and co-axial gas-air single nozzles were co-cooled with gas-hydrogen and oxygen- Through the thermal test, the flow coefficient of each injector, the pressure of the combustion chamber and the wall temperature of the combustion chamber were obtained. The effects of the gas-liquid swirling intensity of the center on the mixing and combustion of propellants were studied. The results show that the coaxial swirl nozzle has a smaller flow coefficient. The central gas-oxygen swirling flow is favorable for improving the combustion efficiency of the propellant, but brings a large thermal load on the combustion chamber and the injection panel.