Citation

Liu C, Wei Z, Han H, Shan Z. China Saf. Sci. J. 2021; 31(9): 106-112.

Copyright

(Copyright © 2021, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2021.09.015

PMID

unavailable

Abstract

In order to ensure precise control and safety of UAV's hover state under crosswind influence, time-averaged and unsteady aerodynamic responses of UAV's rotor with different crosswind speeds were studied by wind tunnel experiment and numerical simulation. Firstly, influence of crosswind speed on time-averaged thrust and torque of rotor was measured by wind tunnel experiment, and then coefficients of rotor dynamic model under different wind speeds were fitted. Then, aerodynamic unsteady effect of a rotor in a rotation period was discussed by numerical simulation. Finally, vorticity field and velocity field were compared under crosswind speed conditions. The results show that crosswind can significantly increase rotor's tension and torque, but high wind speed will lead to low hovering efficiency. When wind speed is high, unsteady aerodynamic effect of rotor can not be ignored, and it is necessary to consider crosswind action and unsteady aerodynamic response when controlling hover state. Crosswind also helps to enhance vortex intensity and induce velocity of rotor downwash vortex. © 2021 China Safety Science Journal. All rights reserved.

Language: zh