Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils

Kinsey, Thomas; Dumas, Guy; Lalande, G.; Ruel, Jean‐Claude; Méhut, A.; Viarouge, P.; Lemay, J.; Jean, Yves

doi:10.1016/j.renene.2010.11.037

Cited by 203 publications

(71 citation statements)

References 3 publications

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“…The force coefficients (C N and C S ) are evaluated by dividing the forces by [12][13][14] arise from the apparent-mass contribution which is very significant for high-reducedfrequency motion.…”

Section: Forces and Moment On Airfoilmentioning

confidence: 99%

“…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%

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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: Forces and Moment On Airfoilmentioning

confidence: 99%

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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“…This would eliminate the effect of wall proximity in towing tanks and allow the testing of larger units and arrays. There have already been some similar experiments with a single turbine [8][9][10] mounted on a boat-like structure. Coiro et al [11] tested a large array of turbines moored stationary in the natural tidal channel of Messina Strait, but it seems nobody has ever done an experiment for an array of turbines with a self-propelled vessel.…”

Section: Experimental Facilitiesmentioning

confidence: 99%

“…They focused on wake characterization with Acoustic Doppler Velocimetry. Kinsey et al [8] described their testing of an oscillating hydrofoils hydrokinetic device. An approximately 10 m long catamaran barge was built to drag two 1.68 m wide hydrofoils through the water at a speed of 2 m/s, propelled by an outboard motor.…”

Section: Past Work In the Interaction Of Units In An Arraymentioning

confidence: 99%

“…Finding an optimal spacing distance is essential for the design of a testing vessel, because it will only be able physically to test a certain spacing range and the optimal value has to lie within. Twelve different simulations were made, with all possible combinations between two sets of longitudinal and lateral spacing expressed in multiples of turbine diameter, (x ∈ [4,6,8,10], y ∈ [2,3,4]). The area which one turbine occupies is calculated by multiplying longitudinal and lateral spacing.…”

Section: Cfd Of Tidal Turbine Arraymentioning

confidence: 99%

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Design of a Novel Experimental Facility for Testing of Tidal Arrays

Pintar

Kolios

2013

Energies

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Abstract:In order to obtain the maximum amount of energy from tidal stream extraction devices, deployment in large arrays should be studied. The area of seabed with favorable conditions is fairly limited; therefore layout spacing has to be optimized. In this paper a feasibility study for a novel experimental facility, suitable for the testing of an array of tidal devices, is presented. To avoid space and scale limitations of towing tanks, testing is proposed to be performed in large lakes or calm seas using a self-propelled vessel, which will carry an array of devices with variable spacing, creating relevant speed differences and measuring their performance and loading. Using hydrodynamic scaling laws, an appropriate size for test turbines and the range of vessel speed was determined to fulfill experimental requirements. Computational fluid dynamic simulations, using the actuator disc method, have suggested a suitable turbine array configuration to resemble real application conditions. A simplified model of the vessel was analyzed using the finite elements method to determine the main scantlings. The hull resistance calculated by empirical formulae was found to be negligible compared to the resistance of the tested turbine. It was confirmed that turbine size and speed determined by scaling laws are also reasonable from a propulsion point of view.

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Investigation of phase difference and separation distance effects in the design of a dual flapping hydrofoil turbine

Jeong

Dang

2023

Energy Science & Engineering

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In this study, a parametric analysis was conducted for the design of a suggested dual flapping hydrofoil turbine. A Navier–Stokes‐based computational fluid dynamics code was utilized for the analysis while varying the pitch angle, reduced frequency, separation distance, and phase difference. The smallest pitch angle of 60° and the reduced frequency of 0.1 among the given ranges of the parameters were fixed for the first parametric analysis. After an assessment, the 90° front‐lead with the longest distance of 6c and the 90° rear‐lead with the shortest distance of 2c were chosen for further parametric analysis based on a suggested performance indicator and a margin for improvement. It was derived from a subsequent parametric analysis that a 70° pitch angle, 0.12 reduced frequency, and a 4c distance for the 90° front‐lead was the final optimum with 59.48% efficiency and 55.44% fluctuation according to the performance indicator as well as the system length and power balance of dual hydrofoils.

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Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils

Cited by 203 publications

References 3 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

Design of a Novel Experimental Facility for Testing of Tidal Arrays

Investigation of phase difference and separation distance effects in the design of a dual flapping hydrofoil turbine

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