A review of progress and challenges in flapping foil power generation

Young, John; Lai, J.C.S.; Platzer, Max F.

doi:10.1016/j.paerosci.2013.11.001

Cited by 288 publications

(118 citation statements)

References 84 publications

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“…These potential benefits have generated interest amongst the micro air vehicle (MAV) community, who aim to take inspiration from nature in designing flapping flyers in small sizes for low speeds [6,7,8]. Aeroelastic phenomena have also been employed successfully in novel energy-harvesting methods [9,10,11,12,13], whereby nonlinear aeroelastic effects are exploited to extract energy from the incoming flow.…”

Section: Introductionmentioning

confidence: 99%

Limit-cycle oscillations in unsteady flows dominated by intermittent leading-edge vortex shedding

Ramesh

Murua

Gopalarathnam

2015

Journal of Fluids and Structures

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High-frequency limit-cycle oscillations of an airfoil at low Reynolds number are studied numerically. This regime is characterized by large apparentmass effects and intermittent shedding of leading-edge vortices. Under these conditions, leading-edge vortex shedding has been shown to result in favorable consequences such as high lift and efficiencies in propulsion/power extraction, thus motivating this study. The aerodynamic model used in the aeroelastic framework is a potential-flow-based discrete-vortex method, augmented with intermittent leading-edge vortex shedding based on a leadingedge suction parameter reaching a critical value. This model has been validated extensively in the regime under consideration and is computationally cheap in comparison with Navier-Stokes solvers. The structural model used has degrees of freedom in pitch and plunge, and allows for large amplitudes and cubic stiffening. The aeroelastic framework developed in this paper is employed to undertake parametric studies which evaluate the impact of different types of nonlinearity. Structural configurations with pitch-to-plunge frequency ratios close to unity are considered, where the flutter speeds are lowest (ideal for power generation) and reduced frequencies are highest. The range of reduced frequencies studied is two to three times higher than most airfoil studies, a virtually unexplored regime. Aerodynamic nonlinearity re- * Corresponding authorEmail addresses: kiran.ramesh@glasgow.ac.uk (Kiran Ramesh), j.murua@surrey.ac.uk (Joseba Murua), agopalar@ncsu.edu (Ashok Gopalarathnam) Fluids and Structures February 10, 2015 sulting from intermittent leading-edge vortex shedding always causes a supercritical Hopf bifurcation, where limit-cycle oscillations occur at freestream velocities greater than the linear flutter speed. The variations in amplitude and frequency of limit-cycle oscillations as functions of aerodynamic and structural parameters are presented through the parametric studies. The excellent accuracy/cost balance offered by the methodology presented in this paper suggests that it could be successfully employed to investigate optimum setups for power harvesting in the low-Reynolds-number regime. Preprint submitted to Journal of

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Section: Introductionmentioning

confidence: 99%

Limit-cycle oscillations in unsteady flows dominated by intermittent leading-edge vortex shedding

Ramesh

Murua

Gopalarathnam

2015

Journal of Fluids and Structures

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“…FIV, on the other hand, could also find applications in energy harvesting and vibration control. Comprehensive reviews on this topic are given by Xiao & Zhu (2014) and Young, Lai & Platzer (2014).…”

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confidence: 99%

Experimental investigation of flow-induced vibration of a rotating circular cylinder

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18605 While flow-induced vibration of bluff bodies has been extensively studied over the last half-century, only limited attention has been given to flow-induced vibration of elastically mounted rotating cylinders. Since recent low-Reynolds-number numerical work suggests that rotation can enhance or suppress the natural oscillatory response, the former could find applications in energy harvesting and the latter in vibration control. The present experimental investigation characterises the dynamic response and wake structure of a rotating circular cylinder undergoing vortex-induced vibration at a low mass ratio (m * = 5.78) over the reduced velocity range leading to strong oscillations. The experiments were conducted in a free-surface water channel with the cylinder vertically mounted and attached to a motor that provided constant rotation. Springs and an air-bearing system allow the cylinder to undertake low-damped transverse oscillations. Under cylinder rotation, the normalised frequency response was found to be comparable to that of a freely vibrating non-rotating cylinder. At reduced velocities consistent with the upper branch of a non-rotating transversely oscillating cylinder, the maximum oscillation amplitude increased with non-dimensional rotation rate up to α ≈ 2. Beyond this, there was a sharp decrease in amplitude. Notably, this critical value corresponds approximately to the rotation rate at which vortex shedding ceases for a non-oscillating rotating cylinder. Remarkably, at α = 2 there was approximately an 80 % increase in the peak amplitude response compared to that of a non-rotating cylinder. The observed amplitude response measured over the Reynolds-number range of (1100 Re 6300) is significantly different from numerical predictions and other experimental results recorded at significantly lower Reynolds numbers.

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“…Such flapping foil turbines have some key potential advantages, including lower foil velocities (and hence lower noise and wildlife impact), and more effective small-scale and shallow water operation. Reference [6] presented an extensive review on the progress in flapping foil power generation in the last few decades. The effects of a number of parameters were investigated, including foil kinematics (modes, frequencies, amplitudes and time histories of motion), foil and system geometry (shape, configuration and structural flexibility), and flow physics effects (Reynolds number and turbulence, shear flows and ground effect).…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting by means of flow-induced vibrations on aerospace vehicles

Ronch

et al. 2016

Progress in Aerospace Sciences

140

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This paper reviews the design, implementation, and demonstration of energy harvesting devices that exploit flow-induced vibrations as the main source of energy.Starting with a presentation of various concepts of energy harvesters that are designed to benefit from a general class of flow-induced vibrations, specific attention is then given at those technologies that may offer, today or in the near future, a potential benefit to extend the operational capabilities and to monitor critical parameters of

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A review of progress and challenges in flapping foil power generation

Cited by 288 publications

References 84 publications

Limit-cycle oscillations in unsteady flows dominated by intermittent leading-edge vortex shedding

Limit-cycle oscillations in unsteady flows dominated by intermittent leading-edge vortex shedding

Experimental investigation of flow-induced vibration of a rotating circular cylinder

Energy harvesting by means of flow-induced vibrations on aerospace vehicles

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