Wave generation by an oscillating surface-pressure and its application in wave-energy extraction

Sarmento, António; Falcão, António F. de O.

doi:10.1017/s0022112085000234

Cited by 303 publications

(112 citation statements)

References 4 publications

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“…Earlier theoretical work on the hydrodynamic performance of OWCs has shown that OWC devices could have a high primary wave energy conversion efficiency if the optimized damping can be attained (Sarmento and Falcao, 6 Evans, 7 and Evans and Porter 8 ) for those fixed or simple OWC devices. For the more complicated and practical OWC devices, the boundary element method (BEM) (and the relevant commercial software, such as WAMIT [WAMIT, User Manual, www.wamit.com/manual.htm (accessed on: 10/05/2014)], ANSYS AQWA [AQWA User Manual, www.mecheng.osu.edu/documentation/Fluent14.5/145/wb_aqwa.pdf (accessed on 10/05/ 2014)], etc.)…”

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confidence: 99%

Assessment of primary energy conversions of oscillating water columns. I. Hydrodynamic analysis

Sheng

Alcorn

Lewis

2014

Journal of Renewable and Sustainable Energy

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This is an investigation on the development of a numerical assessment method for the hydrodynamic performance of an oscillating water column (OWC) wave energy converter. In the research work, a systematic study has been carried out on how the hydrodynamic problem can be solved and represented reliably, focusing on the phenomena of the interactions of the wave-structure and the wave-internal water surface. These phenomena are extensively examined numerically to show how the hydrodynamic parameters can be reliably obtained and used for the OWC performance assessment. In studying the dynamic system, a two-body system is used for the OWC wave energy converter. The first body is the device itself, and the second body is an imaginary “piston,” which replaces part of the water at the internal water surface in the water column. One advantage of the two-body system for an OWC wave energy converter is its physical representations, and therefore, the relevant mathematical expressions and the numerical simulation can be straightforward. That is, the main hydrodynamic parameters can be assessed using the boundary element method of the potential flow in frequency domain, and the relevant parameters are transformed directly from frequency domain to time domain for the two-body system. However, as it is shown in the research, an appropriate representation of the “imaginary” piston is very important, especially when the relevant parameters have to be transformed from frequency-domain to time domain for a further analysis. The examples given in the research have shown that the correct parameters transformed from frequency domain to time domain can be a vital factor for a successful numerical simulation

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confidence: 99%

Assessment of primary energy conversions of oscillating water columns. I. Hydrodynamic analysis

Sheng

Alcorn

Lewis

2014

Journal of Renewable and Sustainable Energy

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“…The mass flux rate of air through the turbines is proportional to the pressure difference across them. Assuming the chamber air to be compressible and its motion isentropic, then for simple harmonic motion of angular frequency u, the complex amplitudes of the total volume flux rateQ and the air pressurep a are related by [27]…”

Section: Oscillating Water Column On the Coastmentioning

confidence: 99%

Hydrodynamic principles of wave power extraction

Mei

2012

Phil. Trans. R. Soc. A.

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The hydrodynamic principles common to many wave power converters are reviewed via two representative systems. The first involves one or more floating bodies, and the second water oscillating in a fixed enclosure. It is shown that the prevailing basis is impedance matching and resonance, for which the typical analysis can be illustrated for a single buoy and for an oscillating water column. We then examine the mechanics of a more recent design involving a compact array of small buoys that are not resonated. Its theoretical potential is compared with that of a large buoy of equal volume. A simple theory is also given for a two-dimensional array of small buoys in well-separated rows parallel to a coast. The effects of coastline on a land-based oscillating water column are examined analytically. Possible benefits of moderate to large column sizes are explored. Strategies for broadening the frequency bandwidth of high efficiency by controlling the power-takeoff system are discussed.

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“…Stated simply, the optimum energy recovery opportunity is when the OWC system is designed to have a Time Constant, T c equal to 1/6 th the wave period, T wave . The flow characteristics of the turbine along with other parameters of the OWC that define a Time Constant (T c ) are given in Equation 1. The Time Constant is a characteristic time parameter, which represents the pneumatic pressure decay within the OWC chamber.…”

Section: Sbir Backgroundmentioning

confidence: 99%

Development of a Wave Energy -Responsive Self-Actuated Blade Articulation Mechanism for an OWC Turbine

Bella¹

2010

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Wave generation by an oscillating surface-pressure and its application in wave-energy extraction

Cited by 303 publications

References 4 publications

Assessment of primary energy conversions of oscillating water columns. I. Hydrodynamic analysis

Assessment of primary energy conversions of oscillating water columns. I. Hydrodynamic analysis

Hydrodynamic principles of wave power extraction

Development of a Wave Energy -Responsive Self-Actuated Blade Articulation Mechanism for an OWC Turbine

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