水空两栖太阳能四旋翼气动特性研究

Research on Aerodynamic Characteristics of Water-air Amphibious Solar Four-rotor

太阳能四旋翼无人机结合了太阳能飞行器和四旋翼飞行器的优点,已受到广泛关注,但由于太阳能板的存在,旋翼的安装高度和轴距会对整机的气动效能产生影响。通过基于粒子法格子玻尔兹曼技术的XFlowCFD软件,对太阳能四旋翼无人机的整机流场进行非定常数值模拟,并分析该飞行器的气动特性。结果表明:旋翼高度对整机升力的影响较小,旋翼的安装轴距越大整机的升力越大,其主要原因是轴距较小时,旋翼产生的下洗流冲击在太阳能板上,对整机产生气动干扰。

Solar four-rotor UAV combines the advantages of solar vehicle and four-rotor vehicle,and has attracted wide attention.However,due to the existence of solar panels,the installation height and wheelbase of the rotor will affect the aerodynamic efficiency of the whole aircraft.Through XFlow CFD software based on particle lattice Boltzmann technology,the unsteady numerical simulation of the whole solar four-rotor UAV flow field is carried out,and the aerodynamic characteristics of the vehicle are analyzed.The results show that the influence of rotor height on the lift of the whole aircraft is small,and the larger the installed wheelbase of the rotor,the greater the lift of the whole aircraft.The main reason is that when the wheelbase is small,the downwash flow generated by the rotor impacts on the solar panel and causes aerodynamic interference to the whole aircraft.