Numerical Study on the Effect of Non-Sinusoidal Motion on the Energy Extraction Performance of Parallel Foils

Wang, Yulu; Zhu, Fahui; Xie, Yonghui

doi:10.3390/app9030384

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…Through the analysis of the flow field, it was found that when the two flapping airfoils were close to each other, a stronger leading edge vortex could be formed than that formed with a single flapping airfoil, and the evolution of the vortex on the suction side of the biplane airfoils could increase the energy capture efficiency. Wang et al 14 studied the energy capture performances of two parallel flapping airfoils under different pitching motion modes by means of numerical simulations, and it was found that with the optimal parameter combination, the interactions between the parallel flapping airfoils could produce larger vortex structures. To reasonably induce vortex interactions, Wu et al 15 arranged two small rotating auxiliary airfoils around a flapping airfoil, which were only used for vortex interactions but did not participate in the energy collection.…”

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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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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Natural Vibration Characteristics of a Cantilever Beam Parametrically Excited by Pitch Motion

Li,

Zhu,

Wang

et al. 2024

Int. J. Str. Stab. Dyn.

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Natural vibration characteristics of a cantilever beam that is parametrically excited by pitch motion are theoretically investigated in this work. A partial differential equation governing the parametrically excited bending vibration of the beam is established by employing the generalized Hamiltonian principle. Normal modal functions of the bending vibration are obtained based on the method of separation of variables. It reveals that the dynamic pitch motion cannot change the modal shapes of the bending vibration of a uniform beam. Principal vibrations of the beam are studied by taking into account two cases of [Formula: see text] and [Formula: see text], where [Formula: see text] and [Formula: see text] are the first and second principal bending stiffness, respectively. The bending stiffness is considered as the superposition of a constant stiffness with a small perturbation. With the aid of the Fourier series theory and the method of multiple scales, the principal vibrations of the parametrically excited system at non-resonant and resonant cases are analyzed by introducing a small natural parameter [Formula: see text], while natural vibration characteristics of the beam are obtained and the orthogonal properties of modal functions are illustrated. Theoretical methods provided in this work are verified by using the finite element method, assumed modes method and direct numerical integrations to the governing equation based on a rectangular beam model. It reveals that theoretical results coincide with numerical results very well. Finally, the influences of design parameters including the beam height, beam width, beam length, slender ratio, aspect ratio, pitch amplitude, pitch frequency and pitch phase on natural frequencies of a harmonic pitching beam are discussed. It shows that the width, height, length, slender ratio, aspect ratio and pitch amplitude have dramatic influences on the natural frequencies of the pitching beam, while the pitch frequency and pitch phase have little effect on natural frequencies.

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Numerical Study on the Effect of Non-Sinusoidal Motion on the Energy Extraction Performance of Parallel Foils

Cited by 2 publications

References 17 publications

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

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

Natural Vibration Characteristics of a Cantilever Beam Parametrically Excited by Pitch Motion

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