空气动力学学报2024，Vol.42Issue(2)：76-84,9.DOI:10.7638/kqdlxxb-2023.0178
小翼羽掠角对机翼增升效果的影响
The effect of alula's sweep angle on wing lift augmentation
摘要
Abstract
Birds deploy several short feathers called alula at the leading edge of wings to suppress stall and increase lift.The sweep angle between the alula and the wing is adjusted according to different flight states.The effects of the alula sweep angle on the aerodynamic performance of the rectangular wing are therefore investigated by utilizing force measurement and particle image velocimetry.Compared to an alula with a zero sweep angle,an alula with an appropriate non-zero forward sweep angle can increase the lift and does not introduce extra drag,thus improves considerably the aerodynamic performance.The underline mechanism is revealed by the flow fields measured by planar and stereo particle image velocimetries,which demonstrate that the alula with an appropriate non-zero forward sweep angle enhances the strength of the leading edge vortex over the wing and broadens the range of angle of attack in which the leading edge vortex can increase the lift.关键词
小翼羽/掠角/风洞/粒子图像测速/前缘涡/增升/流动控制/仿生流体力学/实验Key words
alula/sweep angle/wind tunnel/particle image velocimetry/leading edge vortex/lift augmentation/flow control/biomimetic fluid dynamics/experiment分类
数理科学引用本文复制引用
唐钰涵,王将升,王晋军..小翼羽掠角对机翼增升效果的影响[J].空气动力学学报,2024,42(2):76-84,9.基金项目
国家自然科学基金(12102024,11721202) （12102024,11721202）
