四旋翼控制碟形变体飞艇设计与气动特性分析

Design and Aerodynamic Characteristics Analysis of Quadrotor Control Dish Transformable Airship

为了提高飞艇的水平抗风性能,减少现有飞行器对电池的依赖性并延长其续航时间,本文先提出一种四旋翼控制的太阳能碟形变体飞艇,并对其进行三维结构设计,基于计算流体力学数值模拟技术,采用k-epsilon模型分别对可变体的四旋翼控制碟形飞艇艇体在进行变体后对其各自模型进行气动性能数值模拟计算。结果表明:在艇体体积相等情况下,随着飞行或抗风俯角增大,艇体阻力系数变大;在俯角相同而艇体体积不同情况下,阻力系数随着艇体体积增大而增大;艇体体积增大,会对旋翼产生气动干扰,旋翼损失部分拉力;随着艇体增大和旋翼转速增加,对旋翼产生的气动干扰越大,旋翼气动拉力损失越大。

In order to improve the airship's horizontal wind resistance,reduce the aircraft's battery dependence and extend its flight time,a kind of solar disc-shaped transformable airship controlled by quadrotor is proposed in this paper.The structure of disc-shaped transformable airship is designed by the CATIA software,based on the numerical simulation technologies of computational fluid dynamics,the k-epsilon model is used to calculate the aerodynamic performance of the variant quadrotor control disc-shaped airship body after it had changed volume.The results show that when the volume of airship is the same,the resistance coefficient of the airship body increases with the increase of the flying or wind depression angle;while when angle of depression is the same,the resistance coefficient increases with increase of the airship volume.The aerodynamic interference to the rotor will occur due to the increase of the airship volume,and the rotor would lose part of its tension;with the increase of the airship volume and the rotor speed,the aerodynamic interference would be greater,and the rotor aerodynamic tension loss would also be greater.