Effects of camber angle on aerodynamic performance of flapping-wing micro air vehicle

Yoon, Suk Bon; Cho, Haeseong; Lee, Junhee; Kim, Chongam; Shin, SangJoon

doi:10.1016/j.jfluidstructs.2020.103101

Cited by 27 publications

(14 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…are capable of a passive wing rotation and twist. The camber angle is set to 15 degrees motivated by previous studies 35 , 36 . Two types of wings are used: Wing1 mimics the wing size of hummingbirds 33 , 34 and the hummingbird-like flapping-robot 23 , designed for the standard sea-level conditions named HB wing; Wing2 has a wing area three times that of HB wing named SU wing, respectively, while maintaining a constant aspect ratio (Fig.…”

Section: Introductionmentioning

confidence: 99%

First lift-off and flight performance of a tailless flapping-wing aerial robot in high-altitude environments

Tsuchiya

Aono

Asai

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Flapping flight of animals has captured the interest of researchers due to their impressive flight capabilities across diverse environments including mountains, oceans, forests, and urban areas. Despite the significant progress made in understanding flapping flight, high-altitude flight as showcased by many migrating animals remains underexplored. At high-altitudes, air density is low, and it is challenging to produce lift. Here we demonstrate a first lift-off of a flapping wing robot in a low-density environment through wing size and motion scaling. Force measurements showed that the lift remained high at 0.14 N despite a 66% reduction of air density from the sea-level condition. The flapping amplitude increased from 148 to 233 degrees, while the pitch amplitude remained nearly constant at 38.2 degrees. The combined effect is that the flapping-wing robot benefited from the angle of attack that is characteristic of flying animals. Our results suggest that it is not a simple increase in the flapping frequency, but a coordinated increase in the wing size and reduction in flapping frequency enables the flight in lower density condition. The key mechanism is to preserve the passive rotations due to wing deformation, confirmed by a bioinspired scaling relationship. Our results highlight the feasibility of flight under a low-density, high-altitude environment due to leveraging unsteady aerodynamic mechanisms unique to flapping wings. We anticipate our experimental demonstration to be a starting point for more sophisticated flapping wing models and robots for autonomous multi-altitude sensing. Furthermore, it is a preliminary step towards flapping wing flight in the ultra-low density Martian atmosphere.

show abstract

Section: Introductionmentioning

confidence: 99%

First lift-off and flight performance of a tailless flapping-wing aerial robot in high-altitude environments

Tsuchiya

Aono

Asai

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Kim et al [16] modeled the aerodynamic of flapping wing with a deviation motion by an experiment, and declared that an increase of the deviation angle can substantially reduce the lift, and delay the development of leading-edge vorticity. Yoon et al [17] developed a fluid-structure coupling solver for a three-dimensional flapping wing, and indicated that the passive torsional motion has a significant effect on the aerodynamic performance. Delft University of Technology [18][19][20] developed a FWAV called "DelFly II" with two pairs of flexible wings, which can generate greater lift than that of FWAV with a single pair of wings by CFD.…”

Section: Introductionmentioning

confidence: 99%

Effect of Acceleration on Aerodynamic Performance of Flapping-wing Air Vehicle

Gong

Zhao

et al. 2023

Preprint

View full text Add to dashboard Cite

The acceleration effect on aerodynamic performance of flapping wing air vehicle (FWAV) is studied. A multi-degree-of-freedom three-dimensional bionic flapping wing motion model with acceleration effect is established and the hydrodynamic performance can be obtained by CFD. The aerodynamic coefficient variations are combined to reveal the aerodynamic and pressure distribution characteristics at the transient and peak moments under each acceleration coefficient. The results show that compared with conventional flapping, the acceleration effect of the flapping wing can significantly increase the aerodynamic lift and thrust. The accelerated downstroke of the flapping wing changes the intensity of leading-edge vorticity and trailing edge vorticity, and increases the eddy current adhesion area of the upper surface of the wing. The acceleration effect also increases the capture effect of last cycle LEV shedding of the flapping wing, thus significantly improving aerodynamic performance of the flapping wing.

show abstract

“…They established a wall function based on the model to correct the induced velocity in the UAM vortex, which verified that a flexible wing reduced the negative lift compared with a rigid wing. Yoon [8] has developed a 3D fluid-structure interaction solver for real-world modeling of large deformed wing structures and geometric shapes. The results show that the Camber angle designed at different operating frequencies plays a key role in improving the aerodynamic performance of flapping wings.…”

Section: Introductionmentioning

confidence: 99%

Effects of spatiotemporal parameters and flexible corrugated structures on dragonfly aerodynamics

Wang

2023

Preprint

View full text Add to dashboard Cite

The effects of unsteady motions of flapping flat plates and corrugated structures in different parameters are studied using fluid-solid coupling and overlapping grid methods. Based on the dragonfly's right forewing and right hindwing model, these actions include sweeping and pitching, take-off acceleration, and tandem wings cruising in the reverse phase at 180°. The results show that when the advance ratio J =0.36, the “inflow deflection” improves the aerodynamic force in two degrees of freedom compared to simple flapping. When considering only the impact of flexibility, the aerodynamic forces of flexible flat plates and corrugated structures are better than that of the rigid wing models. Considering the effect of corrugated structures, the lift of flexible corrugated wings diminishes, but more thrust is generated. From the perspective of vortex street, chain vortices materialize only in the downstroke stage, while the attachment effect of leading edge vortices is noticeable in several models. In the same phase flutter, the two wings combine to form a giant wing, which generates significant forward flight momentum. In anti-phase flapping mode, the series wings generate two lifts and two or three thrust peaks to attain the required forward flight speed while sustaining a high lift.

show abstract

Effects of camber angle on aerodynamic performance of flapping-wing micro air vehicle

Cited by 27 publications

References 39 publications

First lift-off and flight performance of a tailless flapping-wing aerial robot in high-altitude environments

First lift-off and flight performance of a tailless flapping-wing aerial robot in high-altitude environments

Effect of Acceleration on Aerodynamic Performance of Flapping-wing Air Vehicle

Effects of spatiotemporal parameters and flexible corrugated structures on dragonfly aerodynamics

Contact Info

Product

Resources

About