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Primary energy conversion performance of “Pendulor” wave energy device with bottom gap
Lekha. U. Bakmeedeniya,S.D.G.S.P. Gunawardane,김병하,이영호 한국마린엔지니어링학회 2020 한국마린엔지니어링학회지 Vol.44 No.4
“Pendulor,” a wave energy device, is the first notable oscillating wave surge converter (OWSC), which consists of a top hinged flap that oscillates in a bounded caisson. From the sea tests conducted by the Muroran Institute of Technology, Japan, it is proven to present 40%–50% energy conversion efficiency. Nevertheless, there are unresolved issues, particularly regarding the phys-ical configurations of the caisson and the flap combination when adopting the OWSC under different sea conditions. The main objec-tive of this research is to investigate the effect of the parametric interactions of caisson configurations on the conversion efficiency. This paper describes the test facility arrangements and the obtained model test results, particularly for the primary energy conversion efficiency of the device for selected configurations. Three-dimensional model tests were conducted in a wave tank to investigate the behavior of a straight caisson configuration using a 1/40th scale following the Froudian scaling for regular waves. Tests were con-ducted for the conventional caisson arrangement (flap without a gap in the caisson) and for a flap with a bottom gap. The results ob-tained for the power extraction for different combinations of the damping torque and the wave frequencies were analyzed to compare the power capture for the above caisson configurations. The discovery of the “pumping mode,” which enhances the power capture, is discussed and was verified in this study.