Flow Visualization Study of the Aerodynamics of Modeled Dragonfly Wings

Obata, Akira; Sinohara, S.

doi:10.2514/1.43836

Cited by 29 publications

(16 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in [8], we found that the dragonfly's corrugated wing plays an important role in producing lift and stability during flight for Reynolds (Re.) numbers between 2000 and 7000.…”

Section: Review Of Aerodynamic Characteristics Of Corrugated Wing Thrmentioning

confidence: 67%

“…In the case of the curved plate wing, half of the grown congested area was blown off by the acceleration and the shape of the streamline flow changed. In the case of the corrugated wing, however, the shape of the streamline did not change at all, but the strength of vortices increased to compensate for the accelerated flow [8].…”

Section: Review Of Aerodynamic Characteristics Of Corrugated Wing Thrmentioning

confidence: 92%

“…In previous work we have shown that dragonflies' corrugated wings exhibit not only outstanding lift generation, but also superior anti-turbulence characteristics compared to conventional wing profiles developed for low speed flight [8]. It is also well known that fixed-wing type flying robots that are less than a few grams in mass are inferior in outdoor flight at low speeds because of their sensitivity to gusts.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aerodynamic Bio-Mimetics of Gliding Dragonflies for Ultra-Light Flying Robot

et al. 2014

View full text Add to dashboard Cite

Abstract:A detailed investigation including a low-speed flow study is presented on the development of ultra-light dragonfly mimetic flying robots with a focus on the dragonfly's remarkable gliding capability. It is revealed that the dragonfly's corrugated wing structure and cruciform configuration provide superior flying characteristics for fixed wing robots in low Reynolds number flight. It was also found that the dragonfly configuration has additional merit in its compatibility with propellers or high lift devices. This combination with such classic aero-engineering makes possible robots with broader flight envelope than conventional fixed-wing flying robots.

show abstract

“…As shown in [8], we found that the dragonfly's corrugated wing plays an important role in producing lift and stability during flight for Reynolds (Re.) numbers between 2000 and 7000.…”

Section: Review Of Aerodynamic Characteristics Of Corrugated Wing Thrmentioning

confidence: 67%

Section: Review Of Aerodynamic Characteristics Of Corrugated Wing Thrmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aerodynamic Bio-Mimetics of Gliding Dragonflies for Ultra-Light Flying Robot

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The vortexes function as a ball bearing, and the strength of the thin blade is significantly increased by the jags. [4] We applied these features of the dragonfly in developing the shape of the air purifier sirocco fan blade.…”

Section: Cross Section Of the Dragonfly Wingmentioning

confidence: 99%

Development of Sirocco Fan Featuring Dragonfly Wing Characteristics

Kumon¹,

Otsuka²

2013

Transactions of The Japan Institute of Electronics Packaging

View full text Add to dashboard Cite

We have developed high-performance electric fans by applying features of the wings of living creatures. This paper proposes an air purifier sirocco fan blade that mimics the wings of a dragonfly. Air quality has increasingly attracted attention in Japanese homes, and one or more air purifiers are installed in almost 40% of all houses in the country. The purpose of an air purifier is to maintain air cleanness, and it is operated overnight. There is, however, the problem of the loud noise created by the fan, which also makes overnight operation inconvenient. To solve this problem, we adopted the shape of the dragonfly wing in the sirocco fan blade of an air purifier. As a result, a maximum reduction of 2.5 dB was achieved.

show abstract

“…Two-dimensional aerodynamic characteristics of thin airfoils at Re 1 Â 10 4 have been investigated by measuring the aerodynamic forces acting on a wing by Okamoto et al, 1) Azuma et al, 2) Kesel, 3) and Sunada et al 4) The aerodynamic characteristics in a wide range of angles of attack of more than 90 deg were investigated by Zhou et al 5) and those of three-dimensional wings were investigated by Okamoto and Azuma. 6) The flow around a corrugated profile has been investigated by Obata and Shinohara 7) and Shi et al 8) In addition, computational solutions of the flow around an airfoil and the forces acting on a wing were simulated by Kunz and Kroo,9) Vargas et al, 10) Levy and Seifert, 11) Kim et al 12) and Hord and Lian. 13) Recently, we investigated the aerodynamic characteristics of thin airfoils having cambers from 3%c to 9%c for a Mars exploratory airplane (which performs in very low Reynolds number flows because of the very small atmospheric density on Mars) by measuring the lift, drag and pitching moment acting on the wing in a low-speed wind tunnel at 3 Â 10 3 Re 20 Â 10 3 .…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Large-Camber Circular Arc Airfoil at Very Low Reynolds Numbers

Okamoto

Ebina

2016

Trans. Japan Soc. Aero. S Sci.

View full text Add to dashboard Cite

The objective of this study is to ascertain the steady-state aerodynamic characteristics of a thin circular arc airfoil with a large-camber by comparing its camber with various cambers at Reynolds numbers ranging from 1©10 3 to 10©10 3 , similar to that of insect flight. A large camber of over 20% chord is seen in the elytra of beetles (Coleoptera), many of which fly by opening the elytra. A low-pressure wind tunnel that we uniquely designed was used to measure the very small forces and moment acting on the wing. As a result, a high maximum lift coefficient was obtained for a large-camber circular arc airfoil, even at Reynolds numbers less than 3©10 3. In addition, the pitching moment of the airfoil was found to be zero in a wide range of angles of attack when the moment center was set to the appropriate position. The large-camber circular arc airfoil will be useful in designing very-low Reynolds number aircraft such as insect-sized micro-air vehicles (MAVs).

show abstract

Flow Visualization Study of the Aerodynamics of Modeled Dragonfly Wings

Cited by 29 publications

References 8 publications

Aerodynamic Bio-Mimetics of Gliding Dragonflies for Ultra-Light Flying Robot

Aerodynamic Bio-Mimetics of Gliding Dragonflies for Ultra-Light Flying Robot

Development of Sirocco Fan Featuring Dragonfly Wing Characteristics

Effectiveness of Large-Camber Circular Arc Airfoil at Very Low Reynolds Numbers

Contact Info

Product

Resources

About