HAG-UUV机翼挂载飞行状态流体特性仿真

Numerical simulation research on hydrodynamic characteristics of HAG-UUV hung under aircraft wing

利用数值仿真的方法研究了高空滑翔无人水下航行器(HAG-UUV)在机翼下挂载飞行状态的流体动力特性.在水平面和铅垂面内,分别分析了HAG-UUV受到的流体扰动.考虑机翼与HAG-UUV的耦合状况,运用Ansys CFX软件完成了数值仿真.研究了无人水下航行器浮心到机翼中线距离540~940mm、攻角-5°~20°及侧滑角-15°~15°等工况对挂载状态的影响,绘制了对HAG-UUV受到的流体作用力和力矩曲线.结果表明:UUV浮心到机翼中线距离小于760mm时壁面效应明显,HAG-UUV在竖直方向受到的流体作用力显著增加;攻角变化会极大改变UUV受到的流体作用,当侧滑角从-15°变化到15°时,UUV受到的流体作用并不关于0°侧滑角对称.当侧滑角为0°时,UUV仍受到流体侧向作用力和偏航力矩的干扰,产生这一现象的原因在于后掠型机翼使流场产生侧向诱导速度.

A series of numerical simulations were carried out to investigate hydrodynamic characteris-tics of the high-altitude glider underwater unmanned vehicle （HAG-UUV）hung under the aircraft wing.In the horizontal plane and the vertical plane,the flow disturbance acting on the HAG-UUV was analyzed.Considering the coupling of the HAG-UUV and the wing,numerical simulations were completed using Ansys CFX.The conditions of different distances between the center of buoyancy of the HAG-UUV and the aircraft wing from 540 mm to 940 mm,different attack angles from -5＆#176;to 20＆#176;and different sideslip angles from -15＆#176;to 15＆#176;were investigated.Then,the curves of the fluid forces and torques were drawn.Results have shown that when the distance between the center of buoyancy and the wing is smaller than 760 mm,wall effect is significant,and the fluid forces acting on the HAG-UUV in the vertical direction rapidly increases.The attack angle greatly enhances the hy-drodynamics of the HAG-UUV.When the sideslip angle changes from -15＆#176;to 15＆#176;,the hydrodynam-ics acting on the HAG-UUV are not asymmetrical about 0＆#176;sideslip angle.When the sideslip angle is 0＆#176;,the HAG-UUV is still disturbed by the lateral force and yaw moment.The reason for this phe-nomenon lies in the sweepback wing,resulting in lateral induced velocity of the flow field.