Study on Wave Energy Focusing Induced by Submerged Composite Crescent Plate.

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Project title

Code/計畫編號

MOST104-2221-E019-035

Translated Name/計畫中文名

複合式新月形沒水平板之聚波效果研究

Project Coordinator/計畫主持人

Wen-Kai Weng

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=11565914

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Bugetid/研究經費

715千元

ResearchField/研究領域

土木水利工程

"本研究主要目的為發展一新型複合式沒水結構物，使其能集中波能並提升波浪能量密度，以供海域波高較小時，增加波能發電的利用效率。結構物型式主要結合凹凸透鏡原理、沒水平板結構與沙漣形狀組合而成一複合式集波結構，其利用凹凸透鏡原理促使波浪因折射而集中波能，另外並結合沒水水平板使波浪淺化，以達提升波浪能量密度的目的，最後並改變沙漣型式為弧形，將其鋪設於平板上而增進波能集中與能量密度提升的程度，因此整個結構體為複合式新月形沒水平板結構。研究方法分別以數值模擬及平面水工試驗進行驗證與探討。數值模擬則在線性波理論基礎下，以三維邊界元素法建構數值模式，探討複合式沒水新月形平板附近平面波場分布，同時檢討規則波波浪於平板後側聚波特性與新月形平板焦距之關係，最後並探討配置於平板上弧形沙漣對聚波與能量密度改變之影響。就水工試驗而言，本研究將於平面水槽中進行規則波試驗，試驗之波高條件以波浪於平板上交會聚波及淺化過程中未發生碎波為原則，試驗波向則分別以正向及斜向入射於複合式新月形沒水平板。試驗的目的除一方面驗證數值模擬結果，另一方面並探討波浪於平板上方與後側的演變情形。本研究探討的參數主要在於聚波的位置範圍與沒水新月形平板曲率焦聚及入射波週期間之關係、能量密度與波週期的關係、平板上弧形沙漣對波浪淺化、聚焦的影響，以及波浪入射方向對聚波之影響等。"
"A new structure of submerged composite crescent plate, which is able to focus wave energy and enhance wave energy density, will be developed in this research for increasing the efficiency of utilizing wave power. The structure is a composite structure that combines a submerged crescent plate with sandbars. Capability of the structure is similar to convex-concave lens and leads wave shoaling to enhance energy density and concentrate wave energy on a region behind submerged plate. Moreover, a series of arc sandbars on plate will increase the capability of wave focusing on the submerged crescent plate. A numerical analysis, based on linear wave theory, by usage of boundary element method is developed for investigating the capability of composite submerged crescent plate, and its advantage will be verified by means of model tests carried out in wave basin. Discussions will be focused on wave transformation in wave field, the relationship between wave focusing and submerged crescent plate, region of wave focusing. The effects of arc sandbars installed on plate on contracting wave energy and enhancing energy density will also be discussed."

Keyword(s)

複合式新月形沒水平板
聚波
能量密度
規則波
submerged composite crescent plate
wave focusing
energy density
regular wave

DSpace CRIS

Study on Wave Energy Focusing Induced by Submerged Composite Crescent Plate.

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