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Abstract
The lack of an efficient and reliable power supply is currently one of the bottlenecks restricting the practical application of unmanned ocean detectors. Wave energy is the most widely distributed ocean energy, with the obvious advantages of high energy density and predictability. In this paper, a novel wave energy converter (WEC) for power supply of low-power unmanned ocean detectors is proposed, which is a small-scale counter-rotating self-adaptive point absorber-type WEC. The double-layer counter-rotating absorbers can achieve the torque balance of the whole device. Besides, the self-adaptation of the blade to the water flow can maintain a unidirectional continuous rotation of the single-layer absorber. The WEC has several advantages, including small occupied space, simple exchange process and convenient modular integration. It is expected to meet the power demand of low-power ocean detectors. Through modeling and CFD analysis, it was found that the power and efficiency characteristics of WEC are greatly influenced by the relative flow velocity, the blade angle of the absorber and the interaction between the upper and lower absorbers. A physical prototype of the WEC was made and some related experiments were conducted to verify the feasibility of WEC working principle and the reliability of CFD analysis.
Highlights
The oceans account for about 70.8% of the Earth’s surface, and contain rich mineral resources, renewable energy and fishery resources [1,2,3,4,5]
The lack of efficient and reliable power supplies is one of the bottlenecks restricting the practical application of these unmanned ocean detectors, and because of this, solving this problem would be of great practical significance
The converter is a compact point absorber based on the counter-rotating selfocean detectors
Summary
The oceans account for about 70.8% of the Earth’s surface, and contain rich mineral resources, renewable energy and fishery resources [1,2,3,4,5]. With the development of ocean science and the exploitation of ocean resources, many advanced unmanned ocean detectors such as surface vehicles, underwater gliders, ocean robots and ocean buoys have emerged and been gradually put into application [6,7]. Most of these ocean detectors are powered by batteries or cables. As an important part of ocean energy, has significant advantages such as wide distribution, high energy density and predictability It can make the detector obtain more energy from a smaller space and is expected to become an ideal energy source for the power supply of unmanned
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