中文摘要：

针对推进式高空长航时螺旋桨无人机布局,应用基于多参考系模型的数值模拟方法开展无人机滑流效应气动影响的三维数值模拟研究。研究结果表明多参考系模型的流动现象能够符合真实螺旋桨的前后流动特征,并且可以较好地模拟螺旋桨滑流对飞机气动性能的干扰。起飞状态螺旋桨滑流效应对全机气动特性影响最强,爬升状态影响减弱,巡航状态影响最小。滑流效应影响随着推力增加而增大,相同推力不同桨距条件下滑流效应影响基本相同。起飞状态无人机尾部受到螺旋桨大推力滑流效应影响压差阻力急剧增加,导致全机气动性能下降。

英文摘要：

For the layout design of an Unmanned Air Vehicle （UAV） with propeller engine, application of three dimensional numerical simulation method on the slipstream aerodynamic effect is investigated based on Multiple Reference Frame （MRF） model. The reseach results shown that the flow field of the MRF model is consistent with true propeller flow, and MRF sim- ulates aerodynamic interference accurately. The influence of propeller slipstream on the aerody- namic performance of an UAV at the status of taking off is most significant, becomes weaker at the status of climbing and the least at the status of cruising. The influence of propeller slipstream is enhanced with the increment of propeller thrust and keeps nearly the same if two sets of pro- peller who have same thrust but different blade attack angle. The pressure drag on the afterbody of the UAV fuselage increases rapidly because of the effect of propeller slipstream flow, deterio- rates the aerodynamic performance of the UAV evidentlv.