Analytical study on wave power extraction from a hybrid wave energy converter. (1st October 2018)

• Record Type: Journal Article
• Authors: Zheng, Siming; Zhang, Yongliang
• Is Part Of: Ocean engineering. Volume 165(2018)
• Page Start: 252
• Page End: 263
• Publication Date: 2018-10-01
• Subjects: Linear potential flow theory -- Analytical model -- Wave power extraction -- Oscillating water column -- Hinged float; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2018.07.021
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: In this paper, a hybrid wave energy converter (WEC) is proposed, consisting of a fixed inverted flume with long length and a bottom hole, and a long floating cube hinged with the flume. The inverted flume and the long floating cube works as an oscillating water column (OWC) and a rotational float, respectively, to capture power from incident waves. To study the performance of this hybrid WEC, analytical solution of the wave diffraction/radiation problems, considering the hydrodynamic interaction between the OWC and the float, is derived based on linear potential flow theory and eigen-function expansion matching method in the two-dimensional Cartesian coordinate systems. The corresponding hydrodynamic coefficients, such as wave excitation forces, added mass and wave radiation damping, are also obtained, which can be further used in evaluation of the maximum theoretical power absorption of the hybrid WEC. Results are compared with a parallel study of an isolated OWC and an isolated float. Additionally, analytical study on power capture capability of the device for various geometrical parameters is then carried out. Highlights: Propose a hybrid wave energy converter (WEC). Present an analytical model of wave power extraction from the hybrid WEC. Validate the analytical model through comparison using three approaches. Carry out a parametric study on power capture capability of the converter. Explore the hydrodynamic interaction between the isolate float and OWC.