金属/水反应冲压发动机三维内流场数值模拟

Numerical simulation on 3D internal flow field of metal/water reaction ramjet

采用颗粒轨道模型进行了燃气发生器式金属/水反应冲压发动机补燃室两相流的数值模拟,建立了水冲压发动机补燃室反应流模型,并对某发动机进行了模拟,研究了一次进水时不同喷注位置和喷孔个数对铝颗粒燃烧效率和发动机性能的影响规律,得出了反应物和产物组分、温度等发动机参数的变化趋势。结果表明,存在使发动机性能达到较优的进水位置,一次进水以2孔对称分布为宜。模拟结果可为发动机设计提供参考。

Two-phase flow of the secondery combustor of the gas generator-type metal/water reaction ramjet was numerically simulated by using particle trajectory model. The reaction flow model of motor seeondery eombustor was established, and a motor was simulated. The effects of different injection locations and jet orifice numbers on combustion efficiency of aluminium particle and motor properties were investigated under once water penetration. The change tendency of motor parameters including ingredients of reactant, product and temperature were obtained. The results show that there exists the optimum inlet location for motor property, Once water penetration should choose two-orifice synunetrieal distribution. The simulation results can provide the reference to motor design.