Numerical analysis and wave tank validation on the optimal design of a two-body wave energy converter

被引：53

作者：

Martin, Dillon ^{[1
]}

Li, Xiaofan ^{[1
]}

Chen, Chien-An ^{[2
]}

Thiagarajan, Krish ^{[3
]}

Ngo, Khai ^{[2
]}

Parker, Robert ^{[1
]}

Zuo, Lei ^{[1
]}

机构：

[1] Virginia Tech, Dept Mech Engn, Blacksburg, VA 24061 USA

[2] Virginia Tech, Dept Elect & Comp Engn, Blacksburg, VA 24061 USA

[3] Univ Massachusetts, Dept Mech & Ind Engn, Amherst, MA 01003 USA

来源：

RENEWABLE ENERGY | 2020年 / 145卷

基金：

美国国家科学基金会;

关键词：

Wave energy converter; Two-body point absorber; Time domain and frequency domain modelling; Wave tank test; MOTION;

D O I：

10.1016/j.renene.2019.05.109

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

To improve the performance of a 'point absorber' type wave energy converter (WEC), an additional submerged body can be deployed. The submerged body can be used to increase the equivalent excitation force on the WEC, as well as provide resonance tuning. This paper presents numerical analysis and experimental validation of a two-body point absorber type WEC using a mechanical motion rectifier (MMR) based power takeoff. The two-body point absorber consists of a floating buoy connected to a neutrally buoyant submerged body via the power-takeoff. The mechanical motion rectifier and a ball screw translate the relative heave motion of the two bodies into unidirectional rotation, which in turn spins a generator. Frequency domain analysis suggests there is an optimal submerged body mass for maximum WEC power absorption. Regular wave simulations in the time domain are compared to the results obtained in the frequency domain. While the time domain and frequency domain results predict the same optimal mass ratio, time domain analysis provides a more complex and accurate power result. To validate the time domain model, experimental wave tank testing is conducted using a 1:30 scale model WEC. The experiment shows the two-body WEC can produce twice the amount of power as the single-body WEC with same floating buoy and can be further increased by PTO design and power electronics optimization. Wave tank testing also shows the two-body WEC has a capture width ratio up to 58% at 59 kW/m and 51% at 36 kW/m. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：632 / 641

页数：10

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