气氧/气甲烷同轴剪切双喷嘴仿真研究

Simulation study on gaseous oxygen/methane double injectors with coaxial shear

通过对气氧/气甲烷同轴剪切双喷嘴的仿真研究,对比不同喷嘴间距对燃烧流场的影响,并对每种工况分别采用了k-ε和k-ωSST两种湍流模型进行计算。结果显示:较大的喷嘴间距会使得喷注器面中心区域和燃烧室前端壁面附近热载较大,而小喷嘴间距能够促进轴线附近的反应区靠前;小喷嘴间距工况下,燃烧室中后段壁面温度较高;k-ωSST模型能够更好地反应回流区形态,但其得到的壁面和喷注器面中心附近的温度,以及燃烧室轴线附近的水组份浓度与k-ε模型的结果相比有所偏低。

The effects of different injector spacing on the combustion flow field were compared through the simulation study on gaseous oxygen/-methane double injectors with coaxial shear. The k-εand k-ω SST turbulent models were used for each calculation condition. The simulation results show that the larger injector spacing will increase the heat load of the central region in the injector plane and the front wall surface of the combustor,while the smaller injector spacing can cause the reaction zone near the axis move forward. under the working condition of small injector spacing,the wall temperature of the middle-rear combustor is higher. The k-ω SST model can better reflect the status of recirculation zone,but the temperature of combustor wall and central region in the injector plane,as well as the concentration of H2 O component near the combustor axis,are all lower than those of the k-ε model.