Wave energy absorption by a floating air bag

Kurniawan, Adi; Chaplin, J.R.; Greaves, Deborah; Hann, Martyn

doi:10.1017/jfm.2016.811

Cited by 49 publications

(46 citation statements)

References 24 publications

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“…Part of the pipes' weight was supported by bungee ropes. A similar experimental setup was implemented in [33] to test a floating air bag wave energy converter at model scale.…”

Section: Scalingmentioning

confidence: 99%

Assessment of Primary Energy Conversion of a Closed-Circuit OWC Wave Energy Converter

2019

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Tupperwave is a wave energy device based on the Oscillating-Water-Column (OWC) concept. Unlike a conventional OWC, which creates a bidirectional air flow across the self-rectifying turbine, the Tupperwave device uses rectifying valves to create a smooth unidirectional air flow, which is harnessed by a unidirectional turbine. This paper deals with the development and validation of time-domain numerical models from wave to pneumatic power for the Tupperwave device and the conventional OWC device using the same floating spar buoy structure. The numerical models are built using coupled hydrodynamic and thermodynamic equations. The isentropic assumption is used to describe the thermodynamic processes. A tank testing campaign of the two devices at 1/24th scale is described, and the results are used to validate the numerical models. The capacity of the innovative Tupperwave OWC concept to convert wave energy into useful pneumatic energy to the turbine is assessed and compared to the corresponding conventional OWC.

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“…Part of the pipes' weight was supported by bungee ropes. A similar experimental setup was implemented in [33] to test a floating air bag wave energy converter at model scale.…”

Section: Scalingmentioning

confidence: 99%

Assessment of Primary Energy Conversion of a Closed-Circuit OWC Wave Energy Converter

2019

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“…where A 1 and Z 1 are the angle and elevation at the top of the bag. On the bottom cylinder, 4) where A N +1 and Z N +1 are the angle and elevation at the bottom of the bag.…”

Section: Theory (A) Static Calculationsmentioning

confidence: 99%

“…where p 1 and p 2 are the pressure amplitudes in V1 and V2, which can be derived from the volumetric change of the bag (details are given in [4]), and C is a real coefficient that relates the air mass flow through the power take-off (PTO) to the pressure difference across it:…”

Section: (B) Linear Frequency-domain Modelmentioning

confidence: 99%

Wave energy absorption by a submerged air bag connected to a rigid float

et al. 2017

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A new wave energy device features a submerged ballasted air bag connected at the top to a rigid float. Under wave action, the bag expands and contracts, creating a reciprocating air flow through a turbine between the bag and another volume housed within the float. Laboratory measurements are generally in good agreement with numerical predictions. Both show that the trajectory of possible combinations of pressure and elevation at which the device is in static equilibrium takes the shape of an S. This means that statically the device can have three different draughts, and correspondingly three different bag shapes, for the same pressure. The behaviour in waves depends on where the mean pressure-elevation condition is on the static trajectory. The captured power is highest for a mean condition on the middle section.

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“…6. Equation (16), which pertains to a bottom‐fixed balloon, are a special form of the more general equations pertaining to a heaving, floating balloon which is treated in [12].…”

Section: Dynamic Responsementioning

confidence: 99%

“…The final N independent equations can be written in matrix form and solved using standard methods. Further details are given in [12].…”

Section: Dynamic Responsementioning

confidence: 99%

Wave power absorption by a submerged balloon fixed to the sea bed

Kurniawan¹,

Greaves

2016

IET Renewable Power Generation

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The possibility of absorbing wave energy using a submerged balloon fixed to the sea bed is investigated. The balloon is in the form of a fabric encased within an array of meridional tendons which terminate at a point at the top of the balloon and at some radius at the bottom. The expansion and contraction of the balloon in waves pump air via a turbine into and out of a chamber of constant volume. A more refined model than that used by Kurniawan and Greaves [Proc. Second Offshore Energy and Storage Symp., 2015] predicts a similarly broad‐banded response, but the maximum absorption is less than previously predicted. Both approaches are compared and discussed.

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Wave energy absorption by a floating air bag

Cited by 49 publications

References 24 publications

Assessment of Primary Energy Conversion of a Closed-Circuit OWC Wave Energy Converter

Assessment of Primary Energy Conversion of a Closed-Circuit OWC Wave Energy Converter

Wave energy absorption by a submerged air bag connected to a rigid float

Wave power absorption by a submerged balloon fixed to the sea bed

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