断阶对超高速气动增升船水气动力特性影响的数值研究

Numerical Study on Infl uence of Step on Hydrodynamic and Aerodynamic Characteristics of Ultra-High-Speed Aerodynamic Alleviation Marine Vehicle

为了探索断阶对超高速气动增升船水气动力特性的影响,利用基于FVM的STAR-CCM+软件分别模拟了有无断阶的超高速气动增升船模型在不同航行工况时的直航运动。基于计算结果,分析了断阶的作用机理并提取了断阶对超高速气动增升船水气动力、航行姿态、艇底浸湿的影响规律。结果表明:设置断阶使得高航速下的阻力性能得到了明显改善,最大减阻效果为33.7%;断阶对气动增升率的影响主要体现在船宽傅汝德数Fr>4.04的高速航速下,在最大航速下,断阶模型的气动增升率提升了约16.7%。

The forward motions of the ultra-high-speed aerodynamic alleviation marine vehicle(AAMV)with or without steps under different sailing conditions are simulated by using the fi nite-volume-method(FVM)based STAR-CCM+software,in order to explore the influence of the step on the hydrodynamic and aerodynamic characteristics of the ultra-high-speed AAMV.The calculated results are analyzed to show the mechanism of the step and its effects on the hydrodynamic and aerodynamic forces,ship’s attitude and wettingwetted area of the ultra-high-speed AAMV.It can be concluded that the step signifi cantly reduce the resistance at high speed with a maximum resistance reduction of 33.7%.It also shows that the step mainly affects the aerodynamic alleviation rate at high speed where the ship width Froude number(Fr)is larger than 4.04.At the maximum speed,the aerodynamic alleviation rate of the step model is increased by about 16.7%.