Effect of cooperative injection and suction jet on power extraction characteristics of a semi-active flapping airfoil

Zhu, Jianyang; Zhu, Mingkang; Cheng, Tinghai

doi:10.1007/s10409-021-01125-8

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…The high-lift mechanism of natural organisms provides ideas for the research of aircraft, and many studies on flapping wing have accordingly been carried out [ 18 , 19 , 20 ]. On this basis, many FMAVs have been designed based on various unsteady mechanisms of biological flight in nature, including Delfly [ 21 ], KUBeet-S from Konkuk University [ 22 ], the FMAV designed at Harvard University [ 23 ], and Nano Hummingbird from Aerovironment [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Aspect Ratio Effects on the Aerodynamic Performance of a Biomimetic Hummingbird Wing in Flapping

et al. 2023

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Hummingbirds are flapping winged creatures with unique flight mechanisms. Their flight pattern is more similar to insects than other birds. Because their flight pattern provides a large lift force at a very small scale, hummingbirds can remain hovering while flapping. This feature is of high research value. In order to understand the high-lift mechanism of hummingbirds’ wings, in this study a kinematic model is established based on hummingbirds’ hovering and flapping process, and wing models imitating the wing of a hummingbird are designed with different aspect ratios. Therefore, with the help of computational fluid dynamics methods, the effect of aspect ratio changes on the aerodynamic characteristics of hummingbirds’ hovering and flapping are explored in this study. Through two different quantitative analysis methods, the results of lift coefficient and drag coefficient show completely opposite trends. Therefore, lift–drag ratio is introduced to better evaluate aerodynamic characteristics under different aspect ratios, and it is found that the lift–drag ratio reaches a higher value when AR = 4. A similar conclusion is also reached following research on the power factor, which shows that the biomimetic hummingbird wing with AR = 4 has better aerodynamic characteristics. Furthermore, the study of the pressure nephogram and vortices diagram in the flapping process are examined, leading to elucidation of the effect of aspect ratio on the flow field around hummingbirds’ wings and how these effects ultimately lead to changes in the aerodynamic characteristics of the birds’ wings.

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Section: Introductionmentioning

confidence: 99%

Aspect Ratio Effects on the Aerodynamic Performance of a Biomimetic Hummingbird Wing in Flapping

et al. 2023

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“…Wu et al 10 considered the influence of synthetic jets on the energy harvesting capabilities of flapping airfoils, and it was found that reasonable jet parameters could significantly change the vortex structure around the flapping airfoil and improve the lift generated by the flapping airfoil. Zhu et al 11 applied cooperative injection and suction jets to the surface of a flapping airfoil. Different from Wu et al, 10 Zhu et al considered the energy consumed by cooperative jets.…”

Section: Introductionmentioning

confidence: 99%

Study on the energy capture efficiency of flapping airfoil power generator using semiactive dual‐layer airfoils

Zhu

Xie

2022

Energy Science & Engineering

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To address the problem that the energy capture efficiencies of existing flapping airfoil power generators are lower than those of traditional turbine generators, a dual‐layer flapping airfoil structure was adopted to improve the energy capture performance of the semiactive flapping airfoil, inspired by the multiwing flying mode of dragonflies in nature. The influence of the dual‐layer flapping airfoil structure on the energy capture performance of a semiactive flapping airfoil was systematically analyzed by a Taguchi experimental design and computational fluid dynamics simulations. The results showed that the dual‐layer flapping airfoil structure mainly improved the energy capture efficiency of the flapping airfoil by increasing the lift force and reducing the maximum sweep distance. Under the optimized parameter combination, the energy capture efficiency of the dual‐layer flapping airfoil reached 28.80%, which was 17.74% higher than that of the single‐layer flapping airfoil. Furthermore, the influence of the dual‐layer flapping airfoil structure on the energy capture performance of a semiactive flapping airfoil was related to the mass ratio of the system, and a larger mass ratio (M* ≥ 40) caused the performance of the dual‐layer flapping airfoil to deteriorate. Analysis of the vortices around the flapping airfoil revealed that there were more attached vortices on the surface of the dual‐layer flapping airfoil, but the increase in the mass ratio led to an advance of the separation of the leading edge vortex, which was the reason that the dual‐layer flapping airfoil with a smaller mass ratio had a better energy capture performance.

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Study on the power extraction performance of a flapping airfoil power generator using jet flow method

Dong

Xie

Zhu

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

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Flapping airfoil power generator (FAPG) is becoming popular due to high-power extraction with low noise. However, the effect of a combined jet of suction and blowing on the power extraction performance of the flapping airfoil is not fully explored. The present study presents a flapping airfoil model with a compound jet of suction and blowing, and the jet parameters were optimized using the Taguchi method and CFD approach for the maximum power extraction efficiency of the airfoil. It was found that the power extraction efficiency of the flapping airfoil can be improved by applying the compound jet to the trailing edge of the airfoil. Compared to the baseline NACA0015 airfoil, the optimized jet parameters lead to the maximum improvement in efficiency by 38.14%. The analysis of flow field characteristics of the flapping airfoil reveals that the optimal jet parameters can not only enhance the strength of the vortex on airfoil but also improve the vortex motion mechanism, which results in a greater lift of airfoil and better synergy between the lift and the plunging velocity.

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Effect of cooperative injection and suction jet on power extraction characteristics of a semi-active flapping airfoil

Cited by 6 publications

References 21 publications

Aspect Ratio Effects on the Aerodynamic Performance of a Biomimetic Hummingbird Wing in Flapping

Aspect Ratio Effects on the Aerodynamic Performance of a Biomimetic Hummingbird Wing in Flapping

Study on the energy capture efficiency of flapping airfoil power generator using semiactive dual‐layer airfoils

Study on the power extraction performance of a flapping airfoil power generator using jet flow method

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