水下拖曳航行器水动力和拖缆姿态仿真分析

Simulation Analysis of Hydrodynamics of Underwater Towing Aircraft and the Attitude of Towed Cable

水下拖曳航行器是被广泛应用的水下监测平台。为掌握水下拖曳航行器的水动力及其拖揽姿态,文章通过CFD仿真分析计算其零攻角下的阻力系数,并通过多刚体-球铰模型建立其运动数学模型,分析不同航速下拖曳系统的总拉力、拖缆长度和航行器位置等的参数变化。研究结果表明:随着船舶航速的变化,拖曳系统各项参数变化的差别很大;在200m深度时,6kn航速相比4kn航速的总拉力增加73%,而所需的拖缆长度仅增加1%。该数学模型可对不同航速下的水下拖曳系统的总拉力和拖缆姿态等做出预测,为拖曳系统设计提供技术支撑。

The underwater towing vehicle is a widely used underwater monitoring platform.In order to study its hydrodynamic and attitude prediction problems,the drag coefficient under the zero angle of attack of the aircraft was obtained through CFD simulation analysis,and the mathematical model of its motion was established by the"multi rigid body-ball joint"model,the parameters such as the total pulling force,the length of the cable and the position of the aircraft at different speeds were analyzed.The results showed that the different parameters of the towing system varied greatly with the ship′s speed changed.Under the depth of 200 m,with ship speed of 6 knots,the total pulling force of the towing system increased by 73%and the required length of cable increased by only 1%compared to ship speed of 4 knots.The mathematical model proposed in this paper can predict the total pulling force of the towing system and the shape of the cable at different speeds,and provide technical support for the design of the towing system.