【摘要】 为了满足货运无人机短距起降的性能要求，需要提高其低速飞行时的升力系数。为此设计了在机翼前缘布置分布式电动螺旋桨的方案。为了满足升力系数指标和分布式电动螺旋桨系统重量要求，设计了16种不同的螺旋桨数量(或直径)和转速的候选方案，并对每种方案的升力特性和系统重量进行了分析。分析结果表明，在给定转速条件下，增加螺旋桨数量(即减小螺旋桨直径),升力系数减小，系统的重量也减小；在给定螺旋桨数量条件下，增加螺旋桨转速，升力系数增大，但系统的重量也增大。货运无人机优选方案是螺旋桨数量为18(直径为0.8 m),转速为3 000 r/min。更多还原

【Abstract】 In order to meet the requirements of short takeoff and landing performance of unmanned cargo vehicle, it is necessary to enhance its lift coefficient at low flight speeds. To reach this target, the design of distributed electric propellers along the leading edge of the wing is studied. The sixteen schemes with different propeller numbers(or diameters) and rotational speeds are designed to enhance the wing lift coefficient with consideration of weight limitation of the distributed electric propeller system. The lift characteristics and the system weight of each scheme are estimated. The results show that the lift coefficient and the system weight decrease with increase of the number of propellers(namely reduction of the propeller diameter) at a given rotational speed. The lift coefficient and the system weight increase with rise of the rotational speed of the propellers at a given number of propellers. For the unmanned cargo vehicle in this study, the preference scheme is that the number of propellers is 18(the diameter is 0.8 meter) and the rotational speed is 3 000 r/min.更多还原