在均勻水流中以雙水翼擷取能量之初步研究

Abstract

現今全球能源的趨勢為使用再生能源，尤其是水力發電。目前水力發電的發展趨勢主要是潮汐發電，一般潮汐發電使用渦輪式發電，但在這裡我們研究另一種發電方式，使用能量擷取器進行發電。能量擷取器最重要的是水翼。因此我分析水翼幾何形狀、擺放位置、轉動效率與能量擷取的關係。 本研究為此題目第一篇。架設實驗需要從零開始。論文中有一部分是在解說實驗架設的流程。包含架設雙水翼系統、選定實驗水翼型號。我選擇了五種水翼進行研究。其中以SARATOV此型水翼轉動功率有最大增益。 本實驗最大的目的是觀察不同型號的雙水翼在特定雷諾數下何種相對位置時會產生最大的轉動效果，進而求出擷取的能量。因軸心固定，所以受力不會作功，不過分析受力可以在往後要製造水翼時有參考的價值。 分析轉動功率以及與雙水翼系統在特定雷諾數之下的效率增益是本實驗的重點部分，可以一目瞭然的看出各水翼的轉動情形，得知轉動情形後我便能依此進一步求出所擷取的能量，達成本研究的目的。 本研究可以得知不同水翼系統在特定雷諾數下擺放位置對轉動功率會有很大的影響。這些影響都直接的反應在能量擷取的回饋上。能量擷取器根據其上安裝的水翼用相對應的排列可以將輸出功率最大化。對於使用能量擷取器的水力發電有相當的幫助。總結所有情形，發現在串聯1.1弦長時影響最劇。

Abstract In recent years, renewable energy is trend around the world, especially Hydroelectric power. The main development currently of Hydroelectric power is tidal stream energy. The majority of existing for tidal devices utilize turbine –based energy converters. I research another energy converters which are energy harvesters. The most important thing of energy harvester is Hydrofoil. So, I analyze the shape, relative position, work efficiency of hydrofoils. This is the first research of the title. I have to install my experiment devices from scratch. There are some parts of this paper explain the process of installing experiment devices, including installing double hydrofoils system, choosing the models of foils. I select five kinds of foils to do my research. The main purpose of this experiment is that observing hydrofoils with different models and defining what relative positions are the hydrofoils product maximum rotational power at specific Reynolds number. Finally, we can calculate the useful energy produced by energy harvester. Because of axis fixed, force acting on hydrofoils cannot do work. Nevertheless, when we start to product the samples of hydrofoils, there are some references of force acting on hydrofoils. Analyzing rotational power and the power gain of double hydrofoils system at specific Reynolds number are final data in the experiment. We can clearly know which relative position each hydrofoils system is. Finally, show pictures of the one cycle situation, which is the maximum power gain of hydrofoils system’s power. By this research, we can know that relative positions of different hydrofoils system make lots of effects at specific Reynolds number. It have the largest power output with the hydrofoils on energy harvesters which arrange at specific relative position. All in all, this research is helpful for energy harvesters used on hydroelectric power.