水下航行体垂直出筒流体动力特性研究

采用数值仿真的方法研究了水下航行体垂直发射出筒过程多相流场和流体动力特性演化规律．结 合动网格技术，采用多相流Mixture模型、Singhal空化模型及标准的A—s湍流模型，对混合流场的RANS方 程进行求解，进而求解了水下航行体运动的固体边界与运动流场相互作用形成了流一固耦合问题，使用此方 法，实现了在重力影响下水下航行体垂直发射出筒过程和流体动力特性进行数值模拟研究，分析了高压气团 对航行体出筒过程中的水弹道及其流体动力特性的影响，分析了航行体压差系数、粘性系数和总力系数波动 的原因

Numerical investigation on hydrodynamic characteristics of underwater vehicle in the vertical launch tube

The multiphase flow characteristics and hydrodynamic evolution during the rise of underwater vehicle in the vertical launch tube have been researched with numerical simulation method. The multiphase mixture model, Singhal cavitation model and a standard k-8 turbulence model with a dynamic mesh technique were adopted to solve RANS equation in conjunction. The fluid-solid coupling problem of moving boundary of missile body and multiphase flow field was solved and the axial symmetric gravity flow field and hydrodynamic character- istics of underwater vehicle were derived by using the numerical simulation. The results show that the gaseous fluid affects on trajectory of underwater vehicle and hydrodynamic load. The volatility reason of different pressure coefficient and viscous force coefficient and toll force coefficient were derived by analyzing simulation results