A Parametric Study of System Integration of Wave Energy Converter with an Open Caisson to Enhance the Power Take-Off

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Project title

Code/計畫編號

MOST106-2221-E019-040-MY2

Translated Name/計畫中文名

整合開口式沉箱與波浪能轉換系統以提高波能擷取之系統設計參數研究

Project Coordinator/計畫主持人

Jiahn-Horng Chen

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Systems Engineering and Naval Architecture

Website

https://www.grb.gov.tw/search/planDetail?id=12231907

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

01-07-2018

Bugetid/研究經費

967千元

ResearchField/研究領域

機械工程

"本計畫擬採用計算流體力學免費公開軟體OpenFOAM，以數值計算的方式，把沉開口箱概念設計與波浪能轉換器整合在一起，透過沉箱內部水域產生共振之原理，有效提高波浪能擷取效率，增進中低波浪能海域的波浪發電可行性。我們擬以二年的規劃期程，完成以下項目的參數設計探討，設計出一個能結合防波堤運用的高效率波能轉換系統，此等系統可使用於中低波能海域（如台灣海域）。第一年：沉箱共振參數研究  探討沉箱相關參數與共振的關係，找出適合我國海域的最佳共振參數。相關的參數包括沉箱開口角度以及開口處之導流結構半徑等。  沉箱開口方向考慮正對入射波方向與背對入射波方向兩種。  入射波考慮一系列的單一週期波（含線性波與非線性波）、以及台灣海域波譜之隨機波。第二年：沉箱波系與波浪能轉換器系統交互作用之參數研究  沉箱內點吸收式波能轉換器設計。  採用計算流體力學流固耦合、以及系統動力學兩種方式，進行波能轉換器之能量擷取係數求取  針對沉箱最佳化參數之條件下，探討波能轉換器參數對擷能之效益。  針對不同週期入射波（線性波與非線性波）與台灣海域波譜之隨機波，探討波能轉換器參數對擷能之效益。將波能轉換器結合沉箱運作，有以下幾個優點，值得我們探討：  適當設計過的沉箱可帶來共振效應，波能（與波高的平方成正比）可提高一倍以上，相當於波能轉換器的能量汲取也可增加一倍以上。  波能轉換器只作起伏（heave）運動，可有效控制波能轉換器浮子的運動，避免在實海域隨機波下做六個自由度的隨機運動，難以控制。  沉箱具有保護波能轉換器的作用。  發電機組可架構在沉箱上，不需複雜的水密系統。" "We propose in this project to integrating wave energy extraction system into a caisson with opening. The study will be conducted computationally via the free open CFD software OpenFOAM. Wave resonance in a properly designed caisson can raise the wave height within it and, in turn, effectively increase the harnessing efficiency of wave energy through wave energy converters. This study will advance the feasibility for harnessing wave energy in areas with medium wave energy density. We plan to conduct a series of parametric study in this two-year project in order to design a cassion-WEC system of high efficiency which is suitable for waters of medium wave energy density such as Taiwan waters and can be used in combination with breakwaters. Year 1: Parametric study for caisson  To study the relation of caisson parameters to resonance and find the optimal values of parameters for Taiwan waters. The parameters include the opening angle and the diameter of wave guidance structure. A map of the parameter effect on resonance will be constructed.  To study the effect of the relative direction of the caisson opening to the incident wave. Two cases will be considered: the opening is on the head sea and following sea sides.  To study the effect of single frequency wave (including linear and nonlinear waves) of different periods and random wave with the wave spectrum of Taiwan waters. Year 2: Parametric study for the interaction between the caisson and WEC  To design a point absorbing WEC.  To study the PTO parameter effect on harnessing wave energy for the optimally designed caisson. The parameters include the mass coefficient and damping coefficient.  To study the wave effect on the WEC system efficiency for single-frequency waves (including linear and nonlinear waves) with various periods and random wave with the wave spectrum of Taiwan waters. The benefits of a caisson-WEC system are manifold and worth of a deep study:  Caisson resonance can easily double the wave power density which is proportional to square of wave amplitude and, hence, the wave energy harnessing through a WEC.  In the caisson, the WEC can have only heave motion which is much simpler for control than the 6-degree motion in an open random sea.  The caisson can provide proper protection to the WEC inside it.  The power take-off and generator system can be fixed on the top of the caisson and above the water. This gets rid of the requirement of system watertightness."

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A Parametric Study of System Integration of Wave Energy Converter with an Open Caisson to Enhance the Power Take-Off

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