Experimental investigation of wake-induced aeroelastic limit cycle oscillations in tandem wings

Kirschmeier, Benjamin; Bryant, Matthew

doi:10.1016/j.jfluidstructs.2018.04.015

Cited by 13 publications

(8 citation statements)

References 28 publications

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“…12 shows how this symmetry is also reflected in the frequency of the modulation. Figures 4.9 and 4.12 both show a low intensity modulation with a dominant modulation frequency equal to f shed − 3 f LCO , that is invariant with respect to bluff body position.…”

mentioning

confidence: 89%

“…Unsteady wing-wake interaction research has undergone profound growth in recent years as researchers utilize knowledge of wake impingement to develop new multi-vehicle flight formations, design novel micro-air vehicles [26], and leverage inspirations from biological swimmers and flyers [13]. Examples of such interactions include close formation flight [2], wake-induced flutter [5,23,12], aerial refueling [3], and fish schooling dynamics [21]. Although diverse in applications, the fundamental thread through this area of research is the characterization of interactions between unsteady wakes and lifting bodies.…”

Section: Introductionmentioning

confidence: 99%

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Limit cycle characterization of an aeroelastic wing in a bluff body wake

Gianikos

Kirschmeier

Gopalarathnam

et al. 2020

Journal of Fluids and Structures

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mentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Limit cycle characterization of an aeroelastic wing in a bluff body wake

Gianikos

Kirschmeier

Gopalarathnam

et al. 2020

Journal of Fluids and Structures

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“…However, its trailing edge wake does produce an amplification of the power output. Recently, Kirschmeier and Bryant [34] experimentally investigated the effect of structural parameters on the aerodynamic coupling between two devices in a tandem configuration. They showed that the limit cycle and transient response of the downstream wing depend heavily on its own pitch stiffness.…”

Section: Introductionmentioning

confidence: 99%

Constructive Aerodynamic Interference in a Network of Weakly Coupled Flutter-Based Energy Harvesters

et al. 2020

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Converting flow-induced vibrations into electricity for low-power generation has received growing attention over the past few years. Aeroelastic phenomena, good candidates to yield high energy performance in renewable wind energy harvesting (EH) systems, can play a pivotal role in providing sufficient power for extended operation with little or no battery replacement. In this paper, a numerical model and a co-simulation approach have been developed to study a new EH device for power generation. We investigate the problem focusing on a weakly aerodynamically coupled flutter-based EH system. It consists of two flexible wings anchored by cantilevered beams with attached piezoelectric layers, undergoing nonlinear coupled bending–torsion limit cycle oscillations. Besides the development of individual EH devices, further issues are posed when considering multiple objects for realizing a network of devices and magnifying the extracted power due to nonlinear synergies and constructive interferences. This work investigates the effect of various external conditions and physical parameters on the performance of the piezoaeroelastic array of devices. From the viewpoint of applications, we are most concerned about whether an EH can generate sufficient power under a variable excitation. The results of this study can be used for the design and integration of low-energy wind generation technologies into buildings, bridges, and built-in sensor networks in aircraft structures.

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“…This forced vibration is considered to be one of the critical reasons for the blade fatigue . Experiments also show that the aeroelastic stability of rotor blades are influenced by the wakes . Therefore, it is important to investigate the forced vibration of the blades caused by the wakes.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] Experiments also show that the aeroelastic stability of rotor blades are influenced by the wakes. 5 Therefore, it is important to investigate the forced vibration of the blades caused by the wakes. Nomenclature: p, pressure; x, y, x-and y-coordinates; t, time; , density; u, v, velocity in x-and y-directions; w, moving speed of wake along inlet; , viscosity coefficient; , frequency; p, u, v, averaged pressure, x-and y-flow speeds; p k , u k , v k , coefficients of the kth-order harmonics of pressure, x-and y-flow speeds; k, order of a harmonic; N, total order of harmonics; i, imaginary unit; x 0 , y 0 , coordinates of inlet point 0; p 0 , u 0 , v 0 , averaged pressure, xand y-flow speeds of point 0; p 0, k , u 0, k , v 0, k , coefficients of the kth-order harmonics of pressure, x-and y-flow speeds of point 0; C l , C m , C d , aerodynamic forces (lift, moment, and drag) of the blade; L, surface of the blade; ds, element of the blade surface; , angle between x-axis and normal direction of the surface; x c , y c , coordinates of center point of the surface; A, B, D, aerodynamic forces of the blade due to averaged inlet condition; A k , B k , D k , coefficients of the kth-order aerodynamic force harmonics;…”

Section: Introductionmentioning

confidence: 99%

An aerodynamic ROM of the blade subjected to wake based on Fourier method for flow

Zhang²,

Xiao

et al. 2018

Numerical Methods in Fluids

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Summary A reduced‐order model (ROM) is presented based on Fourier method for flow to predict aerodynamic forces of blades subjected to periodic time‐varying upstream wakes. In the method, a time‐varying wake is decomposed into harmonic waves by fast Fourier transformation. Using the Fourier method for flow and neglecting the cross‐coupling between harmonics, the aerodynamic forces caused by the wake are represented by a linear combination of harmonics with the same frequencies as the wake. The coefficients of the aerodynamic force harmonics are interpolated at the per‐fitted curves of the normalized Fourier coefficients (coefficients of aerodynamic forces harmonics corresponding to a unit simple harmonic excitation)–frequency relationship. A blade example is used to show the ability of the proposed method. The results indicate that the ROM method can predict the aerodynamic forces of blades caused by wakes efficiently and accurately. The amplitude levels of wakes have a linear impact on the accuracy of the ROM. Neglecting the higher‐order cross‐coupling between the harmonics in the ROM method is acceptable.

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Experimental investigation of wake-induced aeroelastic limit cycle oscillations in tandem wings

Cited by 13 publications

References 28 publications

Limit cycle characterization of an aeroelastic wing in a bluff body wake

Limit cycle characterization of an aeroelastic wing in a bluff body wake

Constructive Aerodynamic Interference in a Network of Weakly Coupled Flutter-Based Energy Harvesters

An aerodynamic ROM of the blade subjected to wake based on Fourier method for flow

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