Aperture Effect of Normal Hovering Flight in Close Proximity to the Ground
Zhou X.1,2, Huang Y.2,3
1School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, PR China
2Department of Mechanics, Huazhong University of Science and Technology, Wuhan, PR China
3 Luoyang Ship Material Research Institute, Luoyang, PR China
Email: xpzhou08@hust.edu.cn

Aerodynamics of a flapping foil at low Reynolds number in close proximity to the ground in aperture effect are studied by numerical simulations based on the normal hovering motion mode. A vortex street is interestingly generated by both ground and aperture effects and the rotation of the foil. The study reveals that the aperture takes a force-reduction effect and a large enough aperture effectively can remove the ground force-enhancement effect produced when the foil is in close proximity to the ground. This paper provides an effective method of optimizing foil-flapping flight design of flying robotics over a porous plane. Keywords: aerodynamics; flapping foil; low Reynolds number; ground effect; aperture effect
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