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標題: | 在均勻水流或角柱尾流中以水翼往復運動來擷取能量之初步研究 A Preliminary Study of Energy Harvesting by a Hydrofoil Reciprocating across a Uniform Stream or in the Wake of a Triangular Cylinder |
作者: | Cheng-Kai Fan 范承凱 |
指導教授: | 朱錦洲(Chin-Chou Chu) |
關鍵字: | 水翼,擺動軸,彈簧,角柱尾流,能量擷取器, hydrofoil,spring,wake of a Triangular Cylinder,energy harvester, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 本研究的目的是要發展一種對環境友善且是自持性的能量擷取系統。實驗系統是利用水 翼在高攻角下所產生的側向推力驅動一線性運動機構,加上巧妙的利用水流改變水翼的攻角,使得該線性運動機構作往復運動,進而帶動發電機構而達到自持性的擷取能量的系統。初步的成果顯示所發展的能量擷取系統應用性強,在溪流或者渠道中都可以使用。
研究初步的構想要使用水翼來行使能量擷取,並利用彈簧作為改變水翼攻角的手段。最重要的參數為擺動軸位置和俯仰運動的彈簧彈性係數,使用三種不同的對稱機翼,看不同形狀的對稱機翼擷取出來的能量會不會有所不同,而數據顯示NACA0012此種翼型有最佳的擷取能量,使用電磁感應作為擷取能量的方法,最好的NACA0012翼型在翼展20公分,水流速度每秒0.26公尺時約有12.11(伏特)的電壓輸出。 測量後發現彈簧的效果有其限制,結果是轉向時間過長,能量擷取會有過多時間呈現無輸出的狀態。本實驗嘗試改變流道特性,並去測量不同的流道參數,一為使用兩邊擋板,還有再加入前方角柱的參數。實驗發現水翼前方加入角柱並同時使用兩邊的擋板的效果最好,能比彈簧最好的效果多加上1.81倍的增益,加上能量擷取時間大幅提升,之後的研究若能改善能樣擷取系統,效率會再有顯著的增加。 本實驗皆使用自持系統,將系統放置於水流中,不管是使用彈簧還是改變流道的方式,重點是不用增加外力就能讓此系統永久的往復運動於流道中,因為不用外加能量,對於能量擷取的效益也較大,加上實驗所使用之流道並不大,在現實生活中不管是溝渠或者小溪流皆有發展的可能性。 The purpose of this study is to develop an environmentally friendly and self-sustaining energy harvesting system. The experimental system uses a lateral thrust generated by the hydrofoil at a high angle of attack to drive a linear motion mechanism. Ingeniously uses the water flow to change the angle of attack of the hydrofoil, so that the linear motion mechanism reciprocates, thereby driving the power generation mechanism. Preliminary results show that the developed energy extraction system is highly applicable and can be used in streams or channels. The preliminary structure of the study wanted to use the hydrofoil to exercise energy extraction and to use the spring as a means of changing the angle of attack of the hydrofoil. The most important parameters are the spring-elastic coefficient of the swinging shaft position and the pitching motion. Using three different symmetrical wings, the energy extracted from the symmetrical wing of different shapes will not be different. Data shows that the NACA0012 is such a wing. The type has the best extraction energy and uses electromagnetic induction as the method of drawing energy. The best NACA0012 airfoil has a wingspan of 20 cm and a water flow speed of 0.26 volts per second with a voltage output of 12.11 (volts). After the measurement, the effect of the spring was found to be limited. As a result, the steering time was too long, and the energy extraction would have an excessive time to exhibit an output-free state. This experiment attempts to change the flow characteristics and measure different flow path parameters, one is to use the two side baffles, and the parameters of the front corner post are added. It is found that the addition of the corner post in front of the hydrofoil and the use of the baffles on both sides are the best. It can add 1.81 times more gain than the best effect of the spring, and the energy extraction time is greatly improved. With the system, the efficiency will increase significantly. In this experiment, the self-sustaining system is used to place the system in the water flow, whether it is using a spring or changing the flow path. The key point is that the system can be permanently reciprocated in the flow channel without increasing the external force, because no energy is needed, for energy. The benefits of the extraction are also large, and the flow path used in the experiment is not large. In real life, there is a possibility of development of ditches or small streams. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73615 |
DOI: | 10.6342/NTU201903907 |
全文授權: | 有償授權 |
顯示於系所單位: | 應用力學研究所 |
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