Experimental wave termination in a 2D wave tunnel using a cycloidal wave energy converter

Siegel, Stefan; Fagley, Casey; Nowlin, Scott R.

doi:10.1016/j.apor.2012.07.003

Cited by 20 publications

(8 citation statements)

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“…The first concept of the CycWEC [14] The first 2D experiments, where the ability of the CycWEC to cancel irregular deep ocean waves were conducted for a 1:300 scale prototype, in a wave tunnel of the US Air Force Academy [37][38][39] in 2011. The studied CycWEC consisted of two hydrofoils attached equidistant to a shaft that is aligned parallel to the incoming waves (Figure 3).…”

Section: Figurementioning

confidence: 99%

“…The first cyclorotor-based WEC prototype, developed by Hermans et al [2], did not have any control actuators. However, Hermans et al proposed pitching the hydrofoils, as a control strategy, to keep the rotating wing in phase with monochromatic FIGURE 22 The control and estimation scheme for the CycWEC [37] wave excitation. A method for calculation of the optimal attack angle 𝛼(t ) for the velocity profile of the incident wave was developed.…”

Section: Overview Of Control Approachesmentioning

confidence: 99%

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Rotors for wave energy conversion—Practice and possibilities

Ermakov

Ringwood

2021

IET Renewable Power Gen

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This review studies some of the existing ideas which create a fundamentally new direction for wave energy converter (WEC) development, obtaining energy from the elliptical motion of particles in water waves using a rotor. The review focuses on three main aspects of rotor-based WECs: experimental study of the developed prototypes, derivation and development of the mathematical models, and control effectors and philosophies for the proposed devices. The range of developed small scale prototypes and their experimental studies are presented. The shortcomings of the current mathematical and hydrodynamic models are identified, while an overview of the proposed and new possible control effectors and strategies is conducted. This allows us to see the state of the development of the different concepts and problems to be solved in bringing wave energy rotors to operational reality.The idea of using a cyclorotor for wave energy absorption is more than 40 years old [1]. During this period of time, only a relatively small number of concepts were proposed, and prototypes built. The comparison of these approaches is challenging, because of the significantly various design and operational principles of the devices. Generally the developed rotor-based WECs can be separated into two groups:This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Figurementioning

confidence: 99%

Section: Overview Of Control Approachesmentioning

confidence: 99%

Rotors for wave energy conversion—Practice and possibilities

Ermakov

Ringwood

2021

IET Renewable Power Gen

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“…With feedback control algorithms to optimize synchronization, the CycWEC was later shown to provide wave termination with better than 99% inviscid efficiency for regular waves [13]. The CycWEC efficiency for irregular waves was found to be between 60% to 80% from numerical and experimental investigations in [14] and [15]. One of the most important observations during the experimental investigation of CycWEC was the presence of 3D radiation effects, the details of which can be found in [16], [17], and [18], along with the sensitivity of the wave cancelation to the offset between the incoming wave phase and rotational angle of the CycWEC shaft.…”

Section: Introductionmentioning

confidence: 99%

Efficiency analysis of the cycloidal wave energy convertor under real-time dynamic control using a 3D radiation model

Mohtat¹,

Fagley²,

Chitale³

et al. 2022

Int. J. Mar. Ene.

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Ocean waves provide a vast, uninterrupted resource of renewable energy collocated around large coastal population centers. Clean energy from ocean waves can contribute to the local electrical grid without the need for long-term electrical storage, yet due to the current high cost of energy extraction from ocean waves, there is no commercial ocean wave farm in operation. One of the wave energy converter (WEC) device classes that show the potential to enable economic energy generation from ocean waves is the class of wave terminators. This work investigates the Cycloidal Wave Energy Converter (CycWEC), which is a one-sided, lift-based wave terminator operating with coupled hydrofoils. The energy that the CycWEC extracted from ocean waves was estimated using a control volume analysis model of the 3D wave field in the presence of the CycWEC. The CycWEC was operated under feedback control to extract the maximum amount of energy possible from the incoming waves, and the interaction with different incoming regular, irregular, and short crested waves was examined.

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“…Extensive research has done to harvest wave energy using oscillating water columns, oscillating body systems, and overtopping converter. 15 Siegel et al 16 harvested ocean wave energy by using an orbital circular motion of the wave. Singh et al 17 have designed a system to harvest ocean wave energy by using oscillating water column technique in deep ocean waves.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of energy harvesting eel in the wake of bluff body under ocean waves

Latif

Ali

Uddin

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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Investigation of the energy harvesting from deep water waves by using flexible piezoelectric eel in a controlled environment is studied. Energy harvesting potential is examined as a function of streamwise distance from the fixed cylinder and spanwise gap along with the cylinder at different wave conditions. Output voltage and eel flapping behavior are dependent on cylinder vortices caused by local wavelength and wave amplitude. Maximum energy is harvested when the eel is placed near to the surface caused by high flapping amplitude and frequency. Similarly, at greater depth low flapping amplitude is observed resulting in small output voltage. Maximum output voltages are found at the shorter wavelength and at a streamwise distance of gx = 1.25 (where gx is the ratio of spacing “S” between cylinder and eel to the diameter of cylinder “D”) for all spanwise gaps along with the cylinder and minimum voltages are calculated at a longer wavelength and streamwise distance gx = 0.75. An increase of 65% in energy harvesting is observed by switching longer wavelengths (λ) to a shorter one and changing the piezo-eel spanwise gap from deep to the shallow depth. Whereas, an increase of 31.5% was found by keeping wavelength constant and changing the spanwise gap of eel. Furthermore, it is observed that energy harvesting from the wake of a bluff body in the wavy motion of water is sensitive to the wavelength and wave height.

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Experimental wave termination in a 2D wave tunnel using a cycloidal wave energy converter

Cited by 20 publications

References 10 publications

Rotors for wave energy conversion—Practice and possibilities

Rotors for wave energy conversion—Practice and possibilities

Efficiency analysis of the cycloidal wave energy convertor under real-time dynamic control using a 3D radiation model

Experimental investigation of energy harvesting eel in the wake of bluff body under ocean waves

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