低空大展弦比无人机翼梢磁梯度测量探头气动特性及影响

针对一种低空大展弦比无人机, 文章进行全机和翼梢磁梯度测量探头数值模拟.全机计算给出翼梢磁梯度测量探头对全机气动特性和操稳特性的影响; 翼梢磁梯度测量探头计算实现了气动外形优化设计, 在保持全机操稳特性的前提下, 最大程度地减小全机气动阻力增量.结果表明, 磁梯度测量探头对全机气动阻力增量在9%之内, 俯仰力矩变化在5%之内, 对全机操稳特性的影响不大, 气动外形优化设计基本满足该低空大展弦比无人机的安全飞行技术要求. 

Aerodynamic Characteristics and Influence of an Airborne Magnetic Gradient Measuring Probe on the Wing-Tip of a High Aspect Ratio UAV at Low Altitude

For a high aspect ratio UAV at low altitude, the flows around both the full vehicle and the airborne magnetic gradient measuring probe on its wing-tip were numerically simulated, respectively. The calculation of the full vehicle obtained the influences of the wing-tip airborne magnetic gradient measuring probe on the full vehicle aerodynamic characteristics and its control and stability; the calculation of the wing-tip airborne magnetic gradient measuring probe implemented its optimization design of aerodynamic configuration, and the aerodynamic drag increment of the full vehicle decreased at the furthest on the premise of keeping the full vehicle control and stability. Results show that the aerodynamic drag increment of the full vehicle related to the airborne magnetic gradient measuring probe is controlled within 9% and the variation of pitching moment is within 5%. The full vehicle control and stability is scarcely influenced by the airborne magnetic gradient measuring probe, and its optimization design of aerodynamic configuration mainly meet the technique requirement of the safe flight of the high aspect ratio UAV at low altitude.