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Zbl 0588.76023
Sarmento, A.J.N.A.; de O.Falcão, A.F.
Wave generation by an oscillating surface-pressure and its application in wave-energy extraction. (English)
[J] J. Fluid Mech. 150, 467-485 (1985). ISSN 0022-1120; ISSN 1469-7645/e

A two-dimensional analysis, based on linear surface-wave theory, is developed for an oscillating-water-column wave-energy device in water of arbitrary constant depth. The immersed part of the structure is assumed of shallow draught except for a submerged vertical reflecting wall. Both the cases of linear and nonlinear power take-off are considered. The results show that air compressibility can be important in practice, and its effects may in general be satisfactorily represented by linearization. The analysis indicates that using a turbine whose characteristic exhibits a phase difference between pressure and flow rate may be a method of strongly reducing the chamber length and turbine size with little change in the capability of energy extraction from regular waves. It was found in two examples of devices with strongly nonlinear power take-off that the maximum efficiency is only marginally inferior to what can be achieved in the linear case.

MSC 2000:: *76B15 Wave motions (fluid mechanics)
76M99 Basic methods in fluid mechanics

Keywords: linear surface-wave theory; oscillating-water-column wave-energy device; water of arbitrary constant depth; shallow draught; submerged vertical reflecting wall; power take-off; air compressibility; linearization; method of strongly reducing; strongly nonlinear power take-off

Cited in: Zbl 1171.76335

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