Numerical investigation of the aerodynamic benefits of wing-wing interactions in a dragonfly-like flapping wing

Shanmugam, A. R.; Sohn, Chang Hyun

doi:10.1007/s12206-019-0519-3

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…In particular, some studies showed that vortex interaction and induced velocity from the wake affected the force production (Xie andHuang 2015, Lua et al 2016), while others showed LEV modification on the hindwing (Broering and Lian 2015, 2012, Zheng et al 2016 from the downwash of the forewing. While several others showed the presence of vertical momentum from the vortices in the wake (Usherwood and Lehmann 2008) (Shanmugam and Sohn 2019) which increased the vertical forces. While all the studies sufficiently explained the change in vertical forces, they cannot be readily extended for different tandem wing configurations.…”

Section: Introductionmentioning

confidence: 99%

Vortex dynamics and on the mechanism of vertical force enhancement in inclined stroke flapping wings

Shanmugam,

Vengadesan

2023

Eng. Res. Express

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The rigorous numerical investigation of the class of inclined stroke plane flapping wings has brought to light the vertical force enhancement due to dipole jet interaction. In this study, the class of inclined stroke plane flapping wings with varying inter-plane distances and stroke inclinations are studied for vertical force generation. The configurations with stroke plane angles of 60° and 75° are found to produce significantly high vertical forces. Further, wake structures of the tandem flapping wing in an inclined stroke plane show various types of dipole vortex shedding and dipole jet interactions. The identified types of dipole jet interactions help in the understanding of vertical force trends of the forewing, hindwing, and hence the tandem wing configuration as a whole. It reveals the potential dipole jet interaction producing the highest vertical force in tandem wing configurations. In all, the study can classify the flows of the tandem wing configurations based on vortex shedding during hovering conditions and understand its vertical force enhancements. This not only helps in getting physical insights into the vortex dynamics of inclined stroke plane flapping wings but also in the design optimisation of the tandem wing configurations in biomimetic Micro Air vehicles (MAVs).

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Section: Introductionmentioning

confidence: 99%

Vortex dynamics and on the mechanism of vertical force enhancement in inclined stroke flapping wings

Shanmugam,

Vengadesan

2023

Eng. Res. Express

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“…The author found that the rigid spanwise with a flexible chordwise wing produces the highest lift with minimum energy consumption. Shanmugan and Sohn 12 performed a numerical investigation on the aerodynamic benefits of the wing-wing interaction of a dragonfly-like flapping wing. They identified two new flow features namely the “enhanced dipole” and “in-sync wake capture and wing-wing interactions” that participate in a significant increase of the lift generation.…”

Section: Introductionmentioning

confidence: 99%

Effects of the wing spacing, phase difference, and downstroke ratio on flapping tandem wings

Younsi

El-Hadj

Rahim

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a numerical study on the effects of the asymmetry in flapping duration, wing spacing, and phase difference on the aerodynamic performance of flapping tandem wings is carried out. Three downstroke ratios to flapping period ( ξ) are chosen, ξ = 0.35, ξ = 0.5, and ξ = 0.65, where ξ = 0.5 represents a symmetrical stroke. Four values of wing spacing L are selected: 1.25c, 1.5c, 1.75c, and 2c (c is the wing chord length), while the phase difference between the fore and hind wings is ranged from 0° to 270° with an interval of 90°. The effects of these parameters on the lift and thrust generation are investigated. A study of the energy consumption and the flight efficiency has also been taken into consideration. The flow variables in the computational domain around the flapping tandem wings are solved using the commercial software Fluent. The results show that the effects of the downstroke ratio on the aerodynamic performance are significantly higher than the effects of the wing spacing and the phase difference. The thrust generation and efficiency are maximized in the case with faster upstroke ( ξ =0.65). However, the maximum lift generation and efficiency are located in the case with faster downstroke ( ξ =0.35) instead. The optimal configuration is obtained using a minimum of wing spacing (1.25c) and phase angle (0°) with a downstroke ratio of 0.436.

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“…To understand the influence of the interaction between the fore-and hindwings, the wing-wing interaction has been studied extensively in recent years. Most previous researchers have adopted numerical simulation [14][15][16][17][18][19][20][21][22], particle-image velocimetry (PIV) [23][24][25][26][27][28][29][30][31] and force-sensor experiments [32,33] to investigate the aerodynamic force and power consumption with varied wing phases. These authors had varied opinions on how effective are the interactions of the fore-and hindwings, and proposed various mechanisms to explain the interactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of wing–wing interaction coupled with morphology and kinematic features of damselflies

et al. 2020

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We investigated the effect of the wing–wing interaction, which is one key aspect of flight control, of damselflies (Matrona cyanoptera and Euphaea formosa) in forward flight that relates closely to their body morphologies and wing kinematics. We used two high-speed cameras aligned orthogonally to measure the flight motions and adopted 3D numerical simulation to analyze the flow structures and aerodynamic efficiencies. The results clarify the effects of wing–wing interactions, which are complicated combinations of biological morphology, wing kinematics and fluid dynamics. As the amplitude of the hindwing of M. cyanoptera is larger than that of E. formosa, the effect of the wing–wing interaction is more constructive. Restricted by the body morphology of E. formosa, the flapping range of the hindwing is below the body. With the forewing in the lead, the hindwing is farther from the forewing, which is not susceptible to the wake of the forewing, and enables superior lift and thrust. Because of the varied rotational motions, the different shed direction of the wakes of the forewings causes the optimal thrust to occur in different wing phases. Because of its biological limitations, a damselfly can use an appropriate phase to fulfill the desired flight mode. The wing–wing interaction is a compromise between lift efficiency and thrust efficiency. The results reveal that a damselfly with the forewing in the lead can have an effective aerodynamic performance in flight. As an application, in the design concept of a micro-aircraft, increasing the amplitude of the hindwing might enhance the wing–wing interaction, thus controlling the flight modes.

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Numerical investigation of the aerodynamic benefits of wing-wing interactions in a dragonfly-like flapping wing

Cited by 9 publications

References 22 publications

Vortex dynamics and on the mechanism of vertical force enhancement in inclined stroke flapping wings

Vortex dynamics and on the mechanism of vertical force enhancement in inclined stroke flapping wings

Effects of the wing spacing, phase difference, and downstroke ratio on flapping tandem wings

Effect of wing–wing interaction coupled with morphology and kinematic features of damselflies

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