• 论文 •

菱形翼布局太阳能无人机螺旋桨滑流影响研究

1. 1. 上海机电工程研究所, 上海 201109;
2. 上海航天动力技术研究所, 上海 201109;
3. 西北工业大学 航空学院, 西安 710072
• 收稿日期:2019-08-12 发布日期:2020-07-18
• 通讯作者: 赵炜 E-mail:zhaowei_0203@163.com
• 作者简介:赵炜 男,硕士研究生,工程师。主要研究方向:飞行器总体设计与气动特性研究。

Effects of propeller slipstream on diamond joined-wing configuration solar-powered UAV

ZHAO Wei1, HUANG Jiangliu2, ZHOU Zhou3, ZHANG Shunjia1, BI Peng1

1. 1. Shanghai Electro-Mechanical Engineering Institute, Shanghai 201109, China;
2. Shanghai Space Propulsion Technology Institute, Shanghai 201109, China;
3. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
• Received:2019-08-12 Published:2020-07-18

Abstract: In order to investigate the influence of propeller slipstream on the aerodynamic characteristics of low Reynolds number diamond joined-wing configuration solar-powered UAV with different rotational speeds. It was simulated accurately by solving the Reynolds Averaged Navier-Stokes (RANS) equation based on Momentum Source Method (MSM) and k-kL-ω transition model. The mechanism of the propeller slipstream effects at different angles of attack and rotational speeds was analyzed by comparing the flow field structure and pressure distribution on the wing surface. The research shows that with the increase of the propeller rotational speed at low angle of attack, the propeller slipstream leads to the obvious increment of lift and decrement of drag. And the maximum lift-to-drag ratio is increased by 18.4% at 3 000 r/min. At low angle of attack, the air flow is accelerated by propeller, and it leads to increment of lift for the Frt-wing. And for the Aft-wing, the rotation of the air flow leads to decrement of pressure drag because of the emergence of low-pressure region at lower surface of leading edge. At high angle of attack, the effects of propeller to the Frt-wing are not changed. However for Aft-wing, the range and strength of low-pressure region at lower surface of leading edge decrease, which leads to the disappearance of negative lift area at leading edge as well as the notable increase of the lift and the pressure drag. Besides, since the main contribution components of lift increment are different at different angles of attack, the longitudinal static stability margin of UAV shows an enhancement with the increase of propeller rotational speed. The diamond joined-wing configuration solar-powered UAV can effectively utilize the slipstream of propeller to improve the aerodynamic performance by reasonably setting the position and speed of propeller.