Generation of the vorticity field by the flapping profile

[摘要] Birds and insects move due to flapping their wings. In the paper we presented unsteady effects that led to the lift and thrust force generation on the flapping foil. It was assumed that the flow was two-dimensional. We demonstrated that flapping motion with low Reynolds produced well-ordered vorticity around the profile. The well-ordered vorticity atmosphere generates predictable aerodynamic force distribution on the profile. We demonstrated that high enough parameters of flapping motion caused the disordered vorticity distribution around the profiles that led to the loss of the lift force and limited the possibility of a flight.

[发布机构] Wroclaw University of Technology, Faculty of Mechanical and Power Engineering, Wybrzeze Wyspiaskiego 27, Wroclaw; 50-370, Poland^1

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Aerodynamic forces;Flapping foil;Flapping motion;Low Reynolds;Thrust forces;Unsteady effects;Vorticity distribution;Vorticity field