水下直升机运动稳定性分析

Numerical analysis of motion stability of an underwater helicopter

文章分析一种新型超机动飞碟形的自主式潜水器—水下直升机的运动稳定性,以实现其在海底复杂的作业任务。采用AYASYS-CFX计算流体力学的仿真模拟技术,分析飞碟形的水下直升机在水平面的机动性和垂直面的运动稳定性等水动力关键技术问题。采用多种数值水池模拟的方法,包括直(斜)航运动和圆池旋臂运动等模拟方法,以计算水下直升机的水动力的稳定性导数、水动力(矩)、随攻角变化的压力中心和阻升比等。在设计航速1 kn的情况下,采用Routh线性水动力导数组成的运动稳定性数学模型,分析其水平及垂直面上的运动稳定性。计算结果说明,水下直升机在水平面上回转运动具有战术直径接近零的超机动能力,同时,在垂直面上具有优于传统鱼雷形潜水器的运动稳定性。

The motion stability of an underwater helicopter,a kind of dish shaped autonomous underwater vehicle with the better maneuverability,is analyzed to accomplish complex tasks under the sea.The CFD simulation technique of ANSYS-CFX is employed to analyze the maneuverability and motion stability of the underwater helicopter in the horizontal and the vertical planes,including direct and oblique motion simulation,rotating arm basin simulation and estimated hydrodynamic center of pressure and drag/lift ratio with the change of AOA.In the low velocity condition within design speed of 1 knot,motion stability of the underwater helicopter in the horizontal and the vertical planes is analyzed by mathematical model with estimated linear hydrodynamic derivatives.The simulation results indicate that the underwater helicopter has strong maneuverability with tactical diameter close to zero in the horizontal turning test,meanwhile,motion stability in the vertical plane is better than conventional torpedo shaped AUVs.