Regularities between kinematic and aerodynamic characteristics of flexible membrane wing

He, Xinhua; Guo, Qinfeng; Wang, Jinjun

doi:10.1016/j.cja.2022.03.015

Cited by 4 publications

(12 citation statements)

References 24 publications

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“…This is similar to the lift-enhancement mechanism of passive vibration of single-layer membrane airfoil (He et al. 2022).…”

Section: Mean Characteristicssupporting

confidence: 76%

“…The membrane may present standing-wave vibration modes at integer multiples of the membrane natural fundamental frequency (Song et al. 2008; Gordnier 2009; Rojratsirikul, Wang & Gursul 2009, 2010; He & Wang 2020; He, Guo & Wang 2022) or travelling-wave modes (Gordnier 2009; Timpe et al. 2013; Serrano-Galiano, Sandham & Sandberg 2018).…”

Section: Introductionmentioning

confidence: 99%

“…2011; Bleisciwitz, de Kat & Ganapathisubramani 2015; He & Wang 2020; He et al. 2022), model installation and supporting methods (Hu, Tamai & Murphy 2008; Arbós-Torrent, Ganapathisubramani & Palacios 2013; Timpe et al. 2013; Bleischwitz, de Kat & Ganapathisubramani 2016, 2018; Bleischwitz et al.…”

Section: Introductionmentioning

confidence: 99%

“…He et al. (2022) proposed novel ideas for active control of a membrane airfoil by controlling the membrane vibration frequency at specific chordwise locations for intensive actuation. Feng et al.…”

Section: Introductionmentioning

confidence: 99%

“…At certain working conditions, the membrane interacts with the surrounding flow, leading to unsteady flow-induced vibration. The membrane may present standing-wave vibration modes at integer multiples of the membrane natural fundamental frequency (Song et al 2008;Gordnier 2009;Rojratsirikul, Wang & Gursul 2009He & Wang 2020;He, Guo & Wang 2022) or travelling-wave modes (Gordnier 2009;Timpe et al 2013;Serrano-Galiano, Sandham & Sandberg 2018). Generally, the mechanism of unsteady flow-induced vibration is the frequency lock-in phenomenon between vortex shedding and membrane vibration.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Aerodynamics and fluid–structure interaction of an airfoil with actively controlled flexible leeward surface

Guo

et al. 2023

J. Fluid Mech.

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Piezoelectric macro-fibre composite (MFC) actuators are employed onto the flexible leeward surface of an airfoil for active control. Time-resolved aerodynamic forces, membrane deformations and flow fields are synchronously measured at low Reynolds number (Re = 6 × 104). Mean aerodynamics show that the actively controlled airfoil can achieve lift-enhancement and drag-reduction simultaneously in the angle of attack range of 10° ≤ α ≤ 14°, where the rigid airfoil encounters stall. The maximum increments of lift and lift-to-drag ratio are 27.1 % and 126 % at the reduced actuation frequency of ${f^ + } = 3.52$ . The unsteady coupling features are further analysed at α = 12°, where the maximum lift-enhancement occurs. It is newly discovered that the membrane vibrations and flow fields are locked into half of the actuation frequency when ${f^ + } > 3$ . The shift of the dominant vibration mode from bending to inclining is the reason for the novel ‘half-frequency lock-in’ phenomenon. To the fluid–structure interaction, there are three characteristic frequencies for the actively controlled airfoil: $S{t_1} = 0.5{f^ + }$ , $S{t_2} = {f^ + }$ , and $S{t_3} = 1.5{f^ + }$ . Here, St1 and its harmonics (St2, St3) are coupled with the natural frequencies of the leading-edge shear layer, resulting in the generation of multi-scale flow structures and suppression of flow separation. The lift presents comparable dominant frequencies between St1 and St3, which means the instantaneous lift is determined by the flow structures of St1 and St3. The local membrane bulge and dent affect the instantaneous swirl strength of flow structures near the maximum vibration amplitude location, which is the main reason for the variation of instantaneous lift.

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“…This is similar to the lift-enhancement mechanism of passive vibration of single-layer membrane airfoil (He et al. 2022).…”

Section: Mean Characteristicssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Aerodynamics and fluid–structure interaction of an airfoil with actively controlled flexible leeward surface

Guo

et al. 2023

J. Fluid Mech.

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Incomplete fluid–structure coupling mechanism of a flexible membrane wing

Wang

2023

Exp Fluids

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Wake interference effects on flow-induced vibration of flexible membrane wings

Li,

Jaiman,

Lei

et al. 2024

Physics of Fluids

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This work investigates the effect of wake interference on the nonlinear coupled dynamics and aerodynamic performance of flexible membrane wings at a moderate Reynolds number. A high-fidelity computational aeroelastic framework is employed to simulate the flow-induced vibration of flexible membrane wings in response to unsteady vortex wake flows produced by an upstream stationary circular cylinder. The coupled dynamics of the downstream membrane are investigated at different gap ratios, aeroelastic numbers, and offset distances. The variations in flow features, membrane responses, and frequency characteristics are analyzed to understand the wake interference effect on membrane aeroelasticity. The results indicate that the aerodynamic performance and flight stability of the downstream membrane are degraded under the wake interference effect. Four distinct flow regimes are classified for the cylinder–membrane configuration, namely (i) single body flow, (ii) co-shedding I, (iii) co-shedding II, and (iv) detached vortex-dominated vibration, respectively. The mode transition is found to build new frequency synchronization between the flexible membrane and its own surrounding flows, or the wake flows of the cylinder, to adjust the aerodynamic performance and membrane vibration. This study sheds new light on membrane aeroelasticity in response to wake flows and enhances understanding of the fluid–membrane coupling mechanism. These findings can facilitate the development of next-generation bio-inspired drones that have high flight efficiency and robust flight stability in gusty flows.

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Regularities between kinematic and aerodynamic characteristics of flexible membrane wing

Cited by 4 publications

References 24 publications

Aerodynamics and fluid–structure interaction of an airfoil with actively controlled flexible leeward surface

Aerodynamics and fluid–structure interaction of an airfoil with actively controlled flexible leeward surface

Incomplete fluid–structure coupling mechanism of a flexible membrane wing

Wake interference effects on flow-induced vibration of flexible membrane wings

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