Experimental investigation on aerodynamic performance of a flapping wing vehicle in forward flight

2011 ◽  
Vol 27 (4) ◽  
pp. 586-595 ◽  
Author(s):  
K. Mazaheri ◽  
A. Ebrahimi
Keyword(s):  
Experimental Investigation ◽  
Aerodynamic Performance ◽  
Flapping Wing ◽  
Forward Flight

scholarly journals Experimental Study of the Aerodynamic Interaction between the Forewing and Hindwing of a Beetle-Type Ornithopter

Aerospace ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 83 ◽  
Author(s):  
Hidetoshi Takahashi ◽  
Kosuke Abe ◽  
Tomoyuki Takahata ◽  
Isao Shimoyama
Keyword(s):  
Pressure Sensors ◽  
Aerodynamic Performance ◽  
Flapping Wing ◽  
Differential Pressure ◽  
Vertical Force ◽  
Unique Combination ◽  
Force Enhancement ◽  
Forward Flight ◽  
Micro Electro Mechanical Systems ◽  
Aerodynamic Interaction

Beetles have attracted attention from researchers due to their unique combination of a passively flapping forewing and an actively flapping hindwing during flight. Because the wing loads of beetles are larger than the wing loads of other insects, the mechanism of beetle flight is potentially useful for modeling a small aircraft with a large weight. In this paper, we present a beetle-type ornithopter in which the wings are geometrically and kinematically modeled after an actual beetle. Furthermore, the forewing is designed to be changeable between no-wing, flapping-wing, or fixed-wing configurations. Micro-electro-mechanical systems (MEMS) differential pressure sensors were attached to both the forewing and the hindwing to evaluate the aerodynamic performance during flight. Whether the forewing is configured as a flapping wing or a fixed wing, it generated constant positive differential pressure during forward flight, whereas the differential pressure on the hindwing varied with the flapping motion during forward flight. The experimental results suggest that beetles utilize the forewing for effective vertical force enhancement.

Experimental Studies to Understand the Hover and Forward Flight Performance of a MAV-Scale Flapping Wing Concept

2012 ◽  
Vol 57 (2) ◽  
pp. 1-11 ◽  
Author(s):  
Ria Malhan ◽  
Moble Benedict ◽  
Inderjit Chopra
Keyword(s):  
Degrees Of Freedom ◽  
Lift Coefficient ◽  
Experimental Studies ◽  
High Amplitude ◽  
Aerodynamic Performance ◽  
Flapping Wing ◽  
Forward Flight ◽  
Flexible Wings ◽  
Wind Speeds ◽  
Torsionally Flexible

Systematic experimental studies were performed to understand the role of two key degrees of freedom, flapping and pitching, in aerodynamic performance of a flapping wing, in both hover and forward flight. Required flapping kinematics is prescribed mechanically, and dynamic pitching/twisting is obtained passively using inertial and aerodynamic forces. Forces produced by the wing are measured at the root using a six-component balance at different flapping frequencies, flapping/pitching amplitudes, and wind speeds. The results clearly show that maximum average thrust over a flap cycle in hover can be achieved using symmetric, high amplitude passive pitching. However, in forward flight, optimum aerodynamic performance (lift and propulsive thrust) is obtained using asymmetric wing pitching with low pitching amplitudes. Furthermore, dynamic twisting (obtained using flexible wings), instead of dynamic pitching, produces better performance in forward flight due to spanwise and temporal modulation of the wing pitch angle. Pure flapping (no pitching) of rigid wings in forward flight at high reduced frequencies and high pitch angles produces a threefold increase in lift coefficient over static values. Maximum average propulsive thrust over a flap cycle in forward flight is obtained using symmetric pitching. To produce high values of both, average lift and thrust, an asymmetry in kinematics along with pitching is required in forward flight. This can be achieved either through asymmetric pitching of rigid wings or dynamic twisting of torsionally flexible wings.

scholarly journals Experimental Investigation on the Aerodynamic Performance of NLF-0414 Iced-Airfoil

2016 ◽  
Vol 9 (2) ◽  
pp. 587-592 ◽  
Author(s):  
abbas ebrahimi ◽  
majid hajipour ◽  
Hossein Hasheminasa ◽  
◽  
◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Aerodynamic Performance

Effect of flexibility on flapping wing characteristics under forward flight

2014 ◽  
Vol 46 (5) ◽  
pp. 055515 ◽  
Author(s):  
Jianyang Zhu ◽  
Chaoying Zhou ◽  
Chao Wang ◽  
Lin Jiang
Keyword(s):  
Flapping Wing ◽  
Forward Flight

Aerodynamic Investigation of Double Surface Airfoil

2021 ◽  
Vol 1 (2) ◽  
pp. 41-46
Author(s):  
Siva J ◽  
Suresh C ◽  
Paramaguru V
Keyword(s):  
Experimental Investigation ◽  
Flow Separation ◽  
Research Work ◽  
Aerodynamic Performance ◽  
Aircraft Industry ◽  
Aerodynamic Efficiency ◽  
Flight Vehicles ◽  
Double Surface ◽  
Naca 0012 ◽  
Aerodynamic Investigation

Aircraft industry has been deeply concerned about reduction of drag by reducing flow separation and improving the aerodynamic efficiency of flight vehicles, particularly in commercial and military market by adopting various methods. Reduction of flow separation is a concept by which we can increase aerodynamic efficiency. The purpose of the project is to perform an experimental investigation on aerodynamic performance of NACA 0012 airfoil model with and without splits. It is evident from this research work that the airfoil model with split possesses greater aerodynamic performance by producing lesser overall drag. This is due to the delay in flow separation from the surface.

Optimal transition of flapping wing micro-air vehicles from hovering to forward flight

2019 ◽  
Vol 90 ◽  
pp. 246-263 ◽  
Author(s):  
Ahmed A. Hussein ◽  
Ahmed E. Seleit ◽  
Haithem E. Taha ◽  
Muhammad R. Hajj
Keyword(s):  
Micro Air Vehicles ◽  
Flapping Wing ◽  
Forward Flight ◽  
Air Vehicles
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