两个设计点的螺旋桨气动性能

结合某垂直起降无人机对螺旋桨的总体设计要求，分析了同时满足两个设计点的螺旋桨设计难点，完成了对所设计螺旋桨性能要求的验证，探究了两个设计点对螺旋桨设计性能的影响及影响因素，获得对设计的指导性结论.通过CFX软件进行悬停和巡航状态下的数值计算，并与其车载试验结果进行对比，结果表明:设计螺旋桨可满足设计要求，且数值模拟与车载试验结果基本吻合，误差不超过11%.将设计螺旋桨与单个设计点的旋翼或巡航螺旋桨进行对比，分析影响因素，发现两个设计点将会降低螺旋桨在每个单独设计点的工作性能，且通过减小起飞总质量和巡航速度、增加动力系统个数和功率来缩小设计点间差异可降低设计难度和性能损失. 

Aerodynamic performance of propeller with two design points

Considering the overall requirement of the propeller for a vertical take off and landing (VTOL) small unmanned air vehicle (SUAV), the difficulty of propeller design with two operating points was analyzed; the designed requirement of propeller performance was verified; the effect of two operating points on the propeller performance was studied; and the instructive conclusions were finally obtained. With CFX software as a tool, hovering and cruising models were calculated and compared with the results of truck mounted experiment. It showed that the propeller can meet the need and the results of simulation agree with the experiments basically with errors less than 11%. The effect of two operating points and the parameters were analyzed through comparison between the designed propeller and the propeller with single operating point. The results show that the performance reduction happens in relation to two operating points, and reducing the total weight and cruise velocity, or increasing number of propulsion and power to decrease the difference between two points can facilitate the design and reduce the performance loss.