Evaluation of geometrical influence on the hydrodynamic characteristics and power absorption of vertical axisymmetric Wave Energy Converters in irregular waves

• Autorzy: Zhang Wanchao , Zhu Yang , Liu Shuxu , Wang Jianhua , Zhang Wentian

Identyfikatory

DOI

10.2478/pomr-2023-0029

• Języki publikacji: EN

Abstrakty

EN

To obtain the mechanical energy of waves from arbitrary directions, the vibration absorbers of wave energy converters (WEC) are usually vertically axisymmetric. In such case, the wave-body interaction hydrodynamics is an essential research topic to obtain high-efficiency wave energy. In this paper, a semi-analytical method of decomposing the complex axisymmetric boundary into several ring-shaped stepped surfaces based upon the boundary approximation method (BAM) is introduced and examined. The hydrodynamic loads and parameters, such as the wave excitation forces, added mass and radiation damping of the vertical axisymmetric oscillating buoys, can then be achieved by using the new boundary discretisation method. The calculations of the wave forces and hydrodynamic coefficients show good convergence with the number of discretisation increases. Comparison between the constringent results and the results of the conventional method also verifies the feasibility of the method. Then, simulations and comparisons of the hydrodynamic forces, motions and wave power conversions of the buoys with series draught and displacement ratios in regular and irregular waves are conducted. The calculation results show that the geometrical shape has a great effect on the hydrodynamic and wave power conversion performance of the absorber. In regular waves, though the concave buoy has the lowest wave conversion efficiency, it has the largest frequency bandwidth for a given draught ratio, while in irregular waves, for a given draught ratio, the truncated cylindrical buoy has the best wave power conversion, and for a given displacement of the buoy, the concave buoy shows the best wave power conversion ability.

Słowa kluczowe

EN

vertical axisymmetric; ring-shaped stepped surface; boundary approximation; constringent; geometrical shape

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2023
• Tom: nr 2
• Strony: 130--145
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Zhang Wanchao

• College of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, China

• https://orcid.org/0000-0002-3735-7834

autor

Zhu Yang

• Jiangsu University of Science and Technology, China

autor

Liu Shuxu

• Jiangsu University of Science and Technology, China

autor

Wang Jianhua

• The PLA Troops 92228, China

autor

Zhang Wentian

• The PLA Troops 92228, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).