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Load shedding characteristics of an oscillating surge wave energy converter with variable geometry

Journal Article · · Ocean Engineering
 [1];  [2];  [3]
  1. Univ. of Maine, Orono, ME (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Univ. of Maine, Orono, ME (United States); Univ. of Massachusetts, Amherst, MA (United States)
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This study reports on performance and load shedding capabilities of an oscillating surge wave energy converter (OSWEC) that utilizes adjustable geometry to control hydrodynamic coefficients. The body consists of a bottom-hinged rectangular paddle in which the frame holds five horizontal flaps spanning the interior of the frame. Each flap can rotate independently about its center of rotation to alter hydrodynamic coefficients. A 1:14 scale model was built for wave tank tests where the OSWEC's natural response to regular waves was measured. Tests with the paddle fixed vertically were conducted to measure the moment induced by incident waves. Conclusions were compared to numerical simulations which determined that flap orientation significantly affected wave energy transmission past the device. Numerical simulations with the addition of a linear rotational damper power take-off (PTO) suggested that with flaps open, the resistive moment was reduced by up to 47%, the surge force on the foundation up to 55%, and the capture width up to 72% over a range of wave periods and PTO damping values. The experimental nondimensional excitation moments and reflection coefficients were reduced by up to 54%. Overall, the flaps provide mechanical means to reduce loads, thus improving the design life of a WEC system.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Water Power Technologies Office (EE-4WP)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1544527
Alternate ID(s):
OSTI ID: 1682397
Report Number(s):
NREL/JA--5000-70962
Journal Information:
Ocean Engineering, Journal Name: Ocean Engineering Journal Issue: C Vol. 186; ISSN 0029-8018
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

16 TIDAL AND WAVE POWER
load shedding
oscillating surge wave energy converter
variable geometry
wave energy converter