【摘要】 为探索水下新型动力系统,以脉冲爆轰发动机(PDE)为载体,研究了爆轰推进应用于水下动力推进的可能性。基于雷诺时均Navier-Stokes方程和耦合Level-Set方程的流体体积函数多相流模型、重整群化k-ε湍流模型建立了PDE水下单次爆轰燃气射流初期流场流动模型,利用计算流体力学方法进行了数值求解。结果表明:前导激波具有明显的指向性,作用时间短,引起的压力扰动变化趋势陡峭;燃气射流引起的压力扰动不具有指向性,作用时间长,引起的压力扰动变化趋势平缓; t=3 ms时,燃气泡的平均横向生长速度为13.1 m/s,平均径向生长速度为12.7 m/s,燃气泡形状从初始扁平型逐渐生长为椭球型。更多还原

【Abstract】 The possibility of using detonation propulsion for underwater power propulsion is studied by taking pulse detonation engine( PDE) as a carrier for a new power system.An initial flow-field flow model of underwater single detonation gas jet from PDE is established based on Reynolds-averaged Navier-Stokes equations,volume-of-fluid multiphase flow model of Level Set equation and RNG k-εturbulence model.The computational fluid dynamics method is used for numerical solution.The results show that the leading shock wave has an obvious directivity and short action time,and the changing trend of pressure perturbation caused by shock wave is steep.The pressure perturbation caused by gas jet has not directivity and long action time,and the changing trend of pressure perturbation caused by gas jet is gentle.For t = 3 ms,the average lateral growth rate of gas bubble is 13.1 m/s,its average radial growth rate is 12.7 m/s,and the shape of gas bubble changes from flat shape to ellipsoid shape gradually.更多还原