The time asymmetric pitching effects on the energy extraction performance of a semi-active flapping wing power generator

Zhu, Jianyang; Tang, Tian

doi:10.1016/j.euromechflu.2017.06.006

Cited by 15 publications

(5 citation statements)

References 19 publications

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“…Based on the free stream velocity and the chord length of the wing, the Reynolds number and Mach number are fixed at a value of 3400 and 0.0015, respectively. According to our previous work [5], at Reynolds number 3400, the flow assuming laminar, the calculating results can match experimental results very well for flapping wing. Therefore, the fluid around the wing is assumed as laminar and incompressible.…”

Section: Numerical Methodsupporting

confidence: 65%

“…Dynamic mesh technique is also employed to update the wing's position (active pitching and passive plunging) at each time step. For more details about the coupling method to solve interaction of fluid and the semiactive flapping wing, one can refer to our previous work [5,17].…”

Section: Numerical Methodmentioning

confidence: 99%

“…Comparing to the conventional rotation energy extraction turbines, flapping wing power generator possesses many advantages, such as simpler design, less construction costs, more efficiency in low stream speeds, and more friendly to the flying creatures in nature [1]. Therefore, more and more recently researches have been focused on this type of power generator [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Damping Coefficient, Spring Coefficient, and Mass Ratio on the Power Extraction Performance of a Semiactive Flapping Wing

Zhu

2019

International Journal of Aerospace Engineering

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The effect of varying damping coefficient C∗, spring coefficient K∗, and mass ratio M∗ on the semiactive flapping wing power extraction performance was numerically studied in this paper. A numerical code based on Finite Volume method to solve the two-dimensional Navier-Stokes equations and coupled with Finite Center Difference method to solve the passive plunging motion equation is developed. At a Reynolds number of 3400 and the pitching axis at quarter chord from the leading edge of the wing, the power extraction performance of the semiactive flapping wing with different damping coefficient, spring coefficient, and mass ratio is systematically investigated. The optimal set of spring coefficient is found at a value of 1.00. However, the variation of mass ratio M∗ cannot increase the maximum mean power coefficient and power efficiency, but it can influence the value of damping coefficient C∗ at which the wing achieves the maximum mean power coefficient and power efficiency. Moreover, insensitivity of the mean power coefficient and power efficiency to the variation of damping coefficient C∗ is observed for the wing with smaller mass ratio, which indicates the wing with smaller M∗ has better working stability.

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Section: Numerical Methodsupporting

confidence: 65%

Section: Numerical Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Damping Coefficient, Spring Coefficient, and Mass Ratio on the Power Extraction Performance of a Semiactive Flapping Wing

Zhu

2019

International Journal of Aerospace Engineering

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“…The study results reveal that the prescribed motion configuration significantly increases the extracted power from the fluid and the efficiency is respectively up to 63% and 50%. Zhu and Tian (2017) have numerically examined the asymmetric time effect of pitching motion on energy extraction performance of a flapping wing designed as energy harvester. The adopting asymmetric time of pitching motion under certain optimal parameters increases the energy extraction efficiency of the flapping wing, up to 17% compared with the time symmetric pitching motion of flapping wing energy harvester.…”

Section: Introductionmentioning

confidence: 99%

Kinematic Optimization of Energy Extraction Efficiency for Flapping Airfoil by using Response Surface Method and Genetic Algorithm

2023

JAFM

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In this paper, numerical simulations have been performed to study the performance of a single fully activated flapping wing serving as energy harvester. The aims of the paper are predicting and maximizing the energy extraction efficiency by using optimization methodology. The metamodeling and the genetic algorithms are applied in order to find the optimal configuration improving the efficiency. A response surface method (RSM) based on Box–Behnken experimental design and genetic algorithm has been chosen to solve this problem. Three optimization factors have been manipulated, i.e. the dimensionless heaving amplitude h0, the pitching amplitude θ0 and the flapping frequency f. The ANSYS FLUENT 14 commercial software has been used to compute the governing flow equations at a Reynolds number of 1100, while the flapping movement combined from heaving and pitching of the NACA0015 foil has been carried out by using an in house user-defined function (UDF). A maximum predicted efficiency of 34.02% has been obtained with high accuracy of optimal kinematic factors of dimensionless heaving amplitude around the chord, high pitching amplitude and low flapping frequency of 0.304 hertz. Results have also showed that the interaction effect between optimization factors is important and the quadratic effect of the frequency is strong confirming the great potential of the applied optimization methodology.

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“…The study of flight principles observed in nature can greatly improve the performance of existing aircrafts and promote the development of new and unique aircrafts [ 1 – 3 ]. Compared with the traditional aircrafts, flapping-wing air vehicles have advantages such as simpler design, lower noise, higher efficiency, and better environmental protection [ 4 – 6 ]. However, observation of insect flight is a relatively recent field of study.…”

Section: Introductionmentioning

confidence: 99%

Design and Mechanical Analysis of Bionic Foldable Beetle Wings

Wang

et al. 2018

Applied Bionics and Biomechanics

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In order to improve the flight performance of collapsible aircrafts, a novel mechanism of bionic foldable wings of beetle is designed based on the four-plate mechanism theory. The folding and unfolding movements of the bionic foldable wings are driven by motor and torsion hinges. Based on the D-H method, a kinematic model of wings is established to analyze the dihedral angle of adjacent plates. The folding ratio of an area in different plate creasing angles has been derived and calculated. Utilizing the kinematic and static models produced, as well as considering the folding ratio and output motor torque, the optimal physical parameters of folding wings are obtained. Dynamic models of rigid and flexible wings were established using ADAMS, and a motion simulation was performed. The relationship between dihedral angle and torque during the folding process of both rigid and flexible wings was obtained. The results provide a better understanding of the folding mechanism through the formulation of rigid-flexible wing analysis, as well as demonstrating a novel design of insect-mimicking artificial wings for small aerial vehicles.

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The time asymmetric pitching effects on the energy extraction performance of a semi-active flapping wing power generator

Cited by 15 publications

References 19 publications

The Effect of Damping Coefficient, Spring Coefficient, and Mass Ratio on the Power Extraction Performance of a Semiactive Flapping Wing

The Effect of Damping Coefficient, Spring Coefficient, and Mass Ratio on the Power Extraction Performance of a Semiactive Flapping Wing

Kinematic Optimization of Energy Extraction Efficiency for Flapping Airfoil by using Response Surface Method and Genetic Algorithm

Design and Mechanical Analysis of Bionic Foldable Beetle Wings

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