Near-wall topological patterns and flow structures over a simplified Danaus plexippus model

Zhu, Yichen; Qu, Yuan; Wang, Jinjun; Ma, Bao-Feng

doi:10.1016/j.cja.2020.04.022

Chinese Journal of Aeronautics

2020

DOI: 10.1016/j.cja.2020.04.022

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Near-wall topological patterns and flow structures over a simplified Danaus plexippus model

Yichen Zhu

Yuan Qu

Jinjun Wang

et al.

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Cited by 2 publications

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“…1(a)) was derived from the typical museum specimen of the corresponding butterfly species. This planform has been used in our previous study (Zhu et al (2020)). To better understand the effects of wing planform, two simplified models were also investigated.…”

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confidence: 99%

Experimental investigation on flow structures of steadily translating low-aspect-ratio wings in low Reynolds number flow

Zhu¹,

Wang²

2021

ISPIV21

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In recent decades, Micro Air Vehicles (MAVs) have been a hot topic for their promising future. But the promotions of MAVs are hindered by their short endurances. To solve this problem, inspirations are brought from migratory butterflies who utilize the ‘flapping-gliding’ skill during long-distance migration to improve the flight efficiency. The butterfly’s gliding flights, which can be simplified by considering the steadily translating fixed wings, have drawn high attentions. Previous studies mainly focus on the aerodynamics of the low-aspect-ratio fixed wings at Re ≈ 105 via force measurements. However, few experimental studies have measured the 3D flow fields. Consequently, the underlying high lift-to-drag ratio mechanisms in the steadily translating butterfly-shaped wings are still not clear. To shed new light on this problem, the 3D flow structures around butterfly-shaped wings were captured and investigated in detail.

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mentioning

confidence: 99%

Experimental investigation on flow structures of steadily translating low-aspect-ratio wings in low Reynolds number flow

Zhu¹,

Wang²

2021

ISPIV21

Self Cite

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Experimental investigation of synthetic jet control of wing rock for a flying wing aircraft

2023

Physics of Fluids

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Flying wing aircraft easily experience wing rock due to the lack of lateral-directional stability, which causes serious challenges to flight control and safety. Thus, it is necessary to reduce the wing rock amplitude or reduce the mean roll angle by additional control. For a flying wing model with a 65° leading-edge sweep, we propose a strategy using an array of synthetic jet actuators to control the wing rock. The control effect and mechanism are studied by attitude measurement and particle image velocimetry measurement in a wind tunnel; the results confirm that the synthetic jet can effectively change the trim position of the wing rock. The control effect is affected by the angle of attack, Reynolds number, actuation position, actuation voltage, and frequency. In general, downstream actuators perform better at low angles of attack, while upstream actuators perform better at high angles of attack; the actuators positioned at the downward rolling side have a better effect than those positioned at the upward side. Furthermore, continuously variable control of the trim position can be achieved by changing the actuation voltage or modulation frequency, which provides a base for attitude manipulation by using active flow control instead of a mechanical control surface. Quantitative analysis of the flow field indicates that the leading-edge vortex on the upward side provides a rolling moment, while the recirculation zone on the downward side also contributes to the wing rock. This is a dynamic process, causing the flying wing to balance at a nonzero mean roll angle. The synthetic jet positioned at the downward rolling side can transport high-momentum fluids to the near-wall region, thereby suppressing flow separation and reducing the size of the recirculation zone. This enhances the lift on the control side and thus reduces the mean roll angle of the wing rock.

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Near-wall topological patterns and flow structures over a simplified Danaus plexippus model

Cited by 2 publications

References 24 publications

Experimental investigation on flow structures of steadily translating low-aspect-ratio wings in low Reynolds number flow

Experimental investigation on flow structures of steadily translating low-aspect-ratio wings in low Reynolds number flow

Experimental investigation of synthetic jet control of wing rock for a flying wing aircraft

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