A computational study on system dynamics of an ocean current turbine

Wu, Jo-Ti; Chen, Jiahn-Horng; Hsin, Ching‐Yeh; Chiu, Fu-Chun

doi:10.1007/s42241-018-0048-z

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…This is a wide range of wave period, for which the FKT system might not be able to work well. It implies that the 3-AML design is not a robust one, compared to the 2-AML design as shown by Wu [23], if the polyester type of mooring line is employed and the line diameter is small. If the diameter is increased to 0.1 m, the dynamic response is much improved, as shown in Fig.…”

Section: Results: 3-aml System With Surface Wavesmentioning

confidence: 99%

“…Hence, the following discussion will focus on system pitching motion only. Before proceeding to the discussion, it should be first mentioned that the system has a natural period of about 5 sec in pitching motion [21], which has been verified by Wu et al [23].…”

Section: Results: 2-aml System With Surface Wavesmentioning

confidence: 99%

“…They pointed out that when the wave length is long, compared to the turbine operation depth, selecting a proper mooring method is important for making the deployment stable. Wu et al [16] have investigated the effect of mooring line design and waves on the dynamics of the current turbine system developed by the research team of the National Taiwan University and the National Taiwan Ocean University. Their results show that the surface waves induce pitching oscillation of the system which becomes significant when the wave propagation is parallel to the current flow and its period is close to the system resonant period.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of The FKT System with Different Mooring Lines

Chen

Hsin

et al. 2019

Polish Maritime Research

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To harness the endless hydrokinetic energy of the Kuroshio current, the joint research team of the National Taiwan University and the National Taiwan Ocean University has developed a floating Kuroshio turbine (FKT) system in Taiwan. In normal operation, the system floats at a certain small depth from the ocean surface to reduce the wave effects and take advantage of faster current speeds. In the present study, the effect of the mooring line on the system dynamics is investigated computationally. Two different auxiliary mooring line designs and, for each design, three different common mooring lines (polyester ropes of neutral buoyancy, iron chains, and 6×19 wires ropes with wire core) are examined. The study makes use of several commercial and in-house packages, integrated to find various coefficients. It is found that the mooring line, the auxiliary mooring line design, and the gravity centre can have a significant effect on system fluctuations in normal operation if the combination of these factors is not properly matched.

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Section: Results: 3-aml System With Surface Wavesmentioning

confidence: 99%

Section: Results: 2-aml System With Surface Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamics of The FKT System with Different Mooring Lines

Chen

Hsin

et al. 2019

Polish Maritime Research

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“…The Floating Kuroshio Turbine (FKT) system (Figure 2) was the collaboration by NTU and NTOU [4]. A laboratory flume test demonstrated that a 1/25 model could generate 850 W of power when the model was towed at a speed of 1.45 m/s [5]. A feasibility study for a 1/5 model has been conducted; it is expected that the larger model would generate higher power up to 20 kW.…”

Section: Development For Ocean Current Energy Harvestermentioning

confidence: 99%

A Simple Nozzle-Diffuser Duct Used as a Kuroshio Energy Harvester

et al. 2021

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In response to the increasing energy demand in Taiwan and the global trend of renewable energy development, Kuroshio energy is a potential energy source. How to extract this invaluable natural resource has then become an intriguing and important question in engineering practices. This study reported the results of a feasibility study for a nozzle-diffuser duct (NDD) as the Kuroshio currents energy harvester. The computational fluid dynamics (CFD) software ANSYS Fluent was employed to calculate the drag and added mass coefficients of the duct anchored to the seabed. Those coefficients were further imported into Orcaflex to simulate the motion of the duct under normal and storm wave conditions. Results showed that the duct was stable 25 m below the sea surface under normal wave conditions. When the wave condition changed to storm waves, the duct needed to dive into at least 90 m below the sea surface to regain its stability and obtain high power take-off (PTO). An optimal design nozzle-diffuser-duct was reported, and a PTO peak of 15 kW was expectable in the Kuroshio currents. Once a suitable offshore platform can be developed with sixty-six NDDs, a Megawatt Kuroshio ocean current power generation system is feasible in the near future.

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