Journal ArticleDOI
Parametric Study of an Oscillating Airfoil in a Power-Extraction Regime
Thomas Kinsey,Guy Dumas +1 more
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TLDR
In this article, the theoretical performance of a wing that is heaving and pitching simultaneously was investigated through unsteady two-dimensional laminar flow simulations using the commercial finite volume computational fluid dynamics code FLUENT.Abstract:
A wing that is heaving and pitching simultaneously may extract energy from an oncoming flow, thus acting as a turbine. The theoretical performance of such a concept is investigated here through unsteady two-dimensional laminar-flow simulations using the commercial finite volume computational fluid dynamics code FLUENT. Computations are performed in the heaving reference frame of the airfoil, thus leaving only the pitching motion of the airfoil to be dealt with through a rigid-body mesh rotation and a circular nonconformal sliding interface. Unsteady aerodynamics basics of the oscillating airfoil are first exposed, with a description of the operating regimes. Effects of unsteadiness are stressed and the inadequacy of a quasi-steady approach to take them into account is exposed. We present a mapping of power-extraction efficiency for a single oscillating airfoil in the frequency and pitching-amplitude domain: 0 55deg in which efficiencies are higher than 20%. Results from a parametric study are then provided and discussed. It is found that motion-related parameters such as heaving amplitude and frequency have the strongest effects on airfoil performances, whereas geometry and viscous parameters turn out to play a secondary role.read more
Citations
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Journal ArticleDOI
A review on flow energy harvesters based on flapping foils
Qing Xiao,Qiang Zhu +1 more
TL;DR: An overview of the state-of-the-art investigations on the recently developed oscillating foil energy converters is presented in this article, where a summary of available knowledge and up-to-date progress in the application of such bio-inspired systems for renewable energy devices is provided.
Journal ArticleDOI
A review of progress and challenges in flapping foil power generation
TL;DR: In this paper, the role of a number of parameters, 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), were investigated.
Journal ArticleDOI
Discrete-vortex method with novel shedding criterion for unsteady aerofoil flows with intermittent leading-edge vortex shedding
TL;DR: In this article, a discrete-time, arbitrary-motion, unsteady thin aerofoil theory with discrete-vortex shedding from the leading edge governed by the instantaneous leading-edge suction parameter (LESP) was proposed.
Journal ArticleDOI
Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils
Thomas Kinsey,Guy Dumas,G. Lalande,Jean Ruel,A. Méhut,Philippe Viarouge,Jean Lemay,Yves Jean +7 more
TL;DR: In this paper, a new concept of hydrokinetic turbine using oscillating hydrofoils to extract energy from water currents (tidal or gravitational) is presented and tested in this investigation.
Journal ArticleDOI
Optimal frequency for flow energy harvesting of a flapping foil
TL;DR: In this paper, the authors numerically simulated a heaving/pitching foil propeller in energy harvesting regime, and investigated the relation between wake stability and the energy harvesting efficiency, finding that the wake is convectively unstable and the frequency of the most unstable mode fw is determined.
References
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General Theory of Aerodynamic Instability and the Mechanism of Flutter
TL;DR: In this paper, the Kutta condition was used to analyze the aerodynamic forces on an oscillating airfoil or an air-foil-aileron combination of three independent degrees of freedom.
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Oscillating foils of high propulsive efficiency
TL;DR: In this article, the phase angle between transverse oscillation and angular motion is the critical parameter affecting the interaction of leading-edge and trailing-edge vorticity, as well as the efficiency of propulsion.
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A study of two-dimensional flow past an oscillating cylinder
TL;DR: In this paper, a detailed study of the wake structures and flow dynamics associated with simulated two-dimensional flows past a circular cylinder that is either stationary or in simple harmonic cross-flow oscillation is presented.
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Wingmill: An Oscillating-Wing Windmill
William McKinney,James DeLaurier +1 more
TL;DR: In this paper, an analytical and experimental investigation of a windmill which utilizes a harmonically oscillating wing to extract wind energy is described. Butler et al. developed a theoretical analysis utilizing unsteady-wing aerodynamics from aeroelasticity and guided the design of a working model for wind-tunnel experiments.
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Vortex methods for high-resolution simulations of viscous flow past bluff bodies of general geometry
TL;DR: In this article, the particle strength exchange (PSE) scheme for diffusion is modified for particles in the vicinity of the solid boundaries to avoid a spurious vorticity flux during the convection/PSE step.