Abstract
A challenging wave energy converter design that utilized the denser energy part of the nearshore breaking wave zone to generate electricity was introduced in 2016 by Shintake. The Okinawa Institute of Science and Technology Graduate University’s project aims to take advantage of breaking wave energy to harness electricity. The 2016 version of the device consisted only of a bare turbine and power generator. Early exploration of the design recorded short periods and high impact wave pressures were experienced by the structure, with the turbine unable to harvest energy effectively. Additional structure to not only reduce incoming impact pressure but also increase the duration of water flow through the turbine was needed. These are the main reasons behind incorporating the duct attachment into the design. This paper show that the duct is capable of halving the impact pressure experienced by the turbine and can increase the energy exposure by up to 1.6 times the bare turbine configuration. Furthermore, it is also said that wave angle (β) = 40° is the critical angle, although the duct still increases wave energy exposure to the power take-off up to β = 60°.
Highlights
The results showed that the first configuration (Figure 2a) may increase both the Ptot and Peff up to 1.5 times the second configuration
Measurements were done twice, once with only the pressure sensor to measure the pressure experienced by a bare turbine, and another one with the duct attached in front of the pressure sensor
A challenging wave energy converter design placed in a breaking wave zone was introduced in 2016
Summary
Academic Editors: Diego Vicinanza, Arianna Azzellino, Lorenzo Cappietti and Claudio LugniReceived: 10 August 2021Accepted: 28 September 2021Published: 8 October 2021Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Licensee MDPI, Basel, Switzerland.Attribution (CC BY) license (https://creativecommons.org/licenses/by/ 4.0/).In 2020, the Japanese government pledged for Japan to be carbon neutral by 2050.This ambitious goal requires huge efforts from research and scientific communities to find more sustainable and renewable sources of electricity. It is estimated that Japan has up to
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