Investigation of High Performance Wave Power Device by the Application of Restoring Force through Elastic Spring

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Project title

Code/計畫編號

NSC98-2221-E236-019

Translated Name/計畫中文名

應用迴力原理研發高效能波浪發電技術之研究

Project Coordinator/計畫主持人

Ruey-Syan Shih

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Department/Unit

Department of construction and spatial design, Tungnan University

Website

https://www.grb.gov.tw/search/planDetail?id=1919375

Year

2009

Start date/計畫起

01-08-2009

Expected Completion/計畫迄

31-07-2010

Bugetid/研究經費

499千元

ResearchField/研究領域

土木水利工程
能源工程

大海中的波浪蘊藏著大量的能量，這些替代能源也是潔淨再生能源最典型的代表，如何有效的加以開發是當前最值得探討的研究議題之一。本研究計劃擬應用迴力原理(restoring force) 提昇波浪在微弱波動運動時之發電效率以及效果，並探討此法實際應用到不良環境條件下之波浪發電上之可行性，將少數能量集中發電，增加波浪之功率以產生較大的效益。由於波浪的能量與波高的平方成正比，而波浪發電迄今尚未能大規模的開發利用主要原因在於波浪本身的不確定性，波高的波高與週期隨著不同的時空背景如日、夜以及季節的變化有極密切之關係，屬於低穩定性較不可靠之能源，因此如何能在有限的波動條件下將波能集中蓄存起來加以充分的利用，以轉換成機械能來帶動發電機發電，已然成為近年來相當受重視的一個再生能源之研究議題。本計劃擬利用上述之原理，以迴力設備來進行水工模型試驗，利用彈性物質如彈簧線圈或發條之回復力，來增加波浪平均波高較小時的發電量。計劃預定以兩年的時間來完成，第一年首先將在斷面造波水槽內以水工模型試驗，利用規則波與不規則波進行試驗，探討不同波浪條件在固定彈性模組迴力設備條件下，彈性體所引起的迴力對波浪能之產生，並與週期性擺動之發電量作比較。為檢驗此構想的可能性，已在斷面水槽中利用簡易之小型馬達進行相關之試驗，經比較後發現回力原理之應用確實可有效提昇整體的發電功效，惟因設備僅為簡易設計的設備，其準確性存在著許多外在因素的誤差，故本計劃將更進一步以密合度較高之精密設計模型與儀器來進行水工模型試驗，減少系統之能量損失以求取更精確的波浪功率(wave power)以及較準確的效益評估，並尋找類似碳纖維之不透水、強度硬輕質的材料作為接受波浪搖擺運動之葉片，配合密合度較高的齒輪來帶動小型發電機的運作。第二年配合不同彈性模組的迴力彈簧裝置，亦即以不同彈性係數之彈性體改變迴力之條件，研究在不同波浪條件下的波浪能功率，尋找最佳化之條件與配置，並分析水槽內設有沒水結構物時對發電系統之影響，結果可提供未來繼續以平面水槽多方向不規則波試驗之參考。本研究利用發展迴力發電之技術來改善並提昇有利的波浪發電的環境條件，研究成果將可應用在目前已發展的各種搖擺式或浮式等發電系統之裝置上，可有效提昇該系統在波浪發電條件較差之環境下的發電量。 Waves in the ocean contains a large amount of energy, this alternative energy source is one of the most typical representatives renewable power, how to development effectively is one of the most popular topics for discussion. The fluctuations of wave require energy, this energy is stored as potential energy, and will be converted into kinetic energy. Restoring force, e.g. elasticity, is a force of an elastic object that tends to pull an object back toward some original position when the object is displaced. An application of restoring force theory to increase the generation of wave power under the circumstances of weak fluctuation are investigate in this study. The feasibility of extending the technique in practice to the development of wave power and/or wind power generation in an environmentally inadequate field is therefore investigated. Wave energy is an alternative energy form of solar energy, which is proportional to the square of its height, as far as we may concern, such energy are not yet extensively developed as the result of its uncertainty, the wave heights and periods varies under different conditions. Hence, many a little makes a mickle, how to make the best used of waves under limited fluctuation by the accumulation of wave with feeble energy to great potential, which may drive the generator to generate electricity by changing it into mechanical energy, and has become an interesting research topics of a renewable energy in recent years. Proceeding of this project would be last for two years. A series of hydraulic model tests would be carry out in the wave flume with regular waves as well as irregular waves in the first year, with the elasticity of the restoring device remained constant in the first instance to investigate over the efficacy of the wave power generation utilizing restoring force through elastic spring, and compared that with power generated by oscillating movement. The feasibility of the restoring device has been rudimentary confirmed by hydraulic model test using a small-scale motor, tentatively. This improvement accrues at least twice power as much as original manner, yet, the experiment should be carry out more accurately with precision instruments and equipments in order to obtain a performance evaluation. The experiments would be carrying out with elastic bodies of various elasticity coefficients under different wave conditions in the second year to investigate over the corresponding wave power and optimizations, moreover, the influence and beneficial results of submerged obstacles will be studied as well. Results can also proceed to the investigations utilizing multi-directional wave basin, prospectively. The feasibility of the technique is applicable in practical applications to the development of existing wave power device.

Keyword(s)

迴力原理
再生能源
水工試驗
波浪功率
波浪發電
波浪能級數
Restoring force
renewable energy
hydraulic model test
wave power
waveenergy device
wave energy magnitude

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Investigation of High Performance Wave Power Device by the Application of Restoring Force through Elastic Spring

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