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通过求解k-ε湍流模型的Navier-Stokes方程组,对以气氢/气氧为推进剂的同轴双剪切喷嘴燃烧室流场进行数值模拟研究.结果表明:气-气推进剂在燃烧室内形成两个燃烧面,能在大流量下实现较高的燃烧效率;同轴双剪切喷嘴的氧喷注速度和氢氧速度比是同轴双剪切喷嘴设计的关键参数,氧喷注速度越小使推进剂的燃烧位置越远离喷注面,而氢氧速度比越大使燃烧位置越靠前;与气-液同轴剪切喷嘴相比,同轴双剪切气-气喷嘴的设计可以取较大的氧喷注速度和适合的氢氧速度比.
The Navier-Stokes equations of k-ε turbulence model are solved to simulate the flow field in the combustor of coaxial double-shear nozzle with gas-hydrogen / gas-oxygen propellant.The results show that the gas- Two combustion surfaces are formed in the chamber, which can achieve high combustion efficiency under high flow rate. The oxygen injection speed and hydrogen-oxygen ratio of coaxial double-shear nozzle are the key parameters of the coaxial double-shear nozzle design. The smaller the speed, the more the combustion position of the propellant is away from the injection surface, and the greater the ratio of hydrogen to oxygen is, the more forward the combustion position. Compared with the gas-liquid coaxial shear nozzle, the coaxial double shear gas- Design can take a larger oxygen injection speed and suitable speed ratio of hydrogen and oxygen.