本文選題：水平軸潮流能發(fā)電機(jī)　切入點(diǎn)：尾流效應(yīng)　出處：《浙江大學(xué)》2014年碩士論文

【摘要】：潮流能是一種具有巨大潛力的可再生海洋資源,潮流能發(fā)電技術(shù)已逐步從工程樣機(jī)進(jìn)入商業(yè)化應(yīng)用階段。水平軸潮流能發(fā)電機(jī)是潮流能發(fā)電裝置的一種重要形式。在其運(yùn)行過程中,通過發(fā)電機(jī)轉(zhuǎn)子后的水流流速和流向都發(fā)生變化,這種對(duì)初始來流流速的影響稱為尾流效應(yīng)。尾流效應(yīng)影響下游發(fā)電機(jī)轉(zhuǎn)子的入流速度,從而影響發(fā)電機(jī)輸出功率的大小,因此尾流效應(yīng)的研究是水平軸潮流能發(fā)電機(jī)優(yōu)化布局的一個(gè)重要基礎(chǔ),具有很大的理論和實(shí)際意義。 本文介紹了水平軸潮流能發(fā)電機(jī)的相關(guān)概念和理論基礎(chǔ)知識(shí),在此基礎(chǔ)上針對(duì)影響水平軸潮流能發(fā)電機(jī)尾流效應(yīng)的不同因素,設(shè)計(jì)了研究水平軸潮流能發(fā)電機(jī)尾流效應(yīng)的實(shí)驗(yàn)方案,并進(jìn)行了水槽實(shí)驗(yàn)。實(shí)驗(yàn)中通過改變影響尾流效應(yīng)的因素(初始流速、推力系數(shù)、湍流強(qiáng)度、安裝高度和地形等),測量在沿水流方向和垂直水流方向的尾流流速,對(duì)尾流效應(yīng)進(jìn)行平面二維研究和分析。實(shí)驗(yàn)結(jié)果表明： 沿水流方向,初始流速越大,下游尾流流速的收斂值越大；推力系數(shù)對(duì)尾流的影響集中在5d(d為發(fā)電機(jī)轉(zhuǎn)子直徑)范圍內(nèi),在15d以后不同推力系數(shù)的尾流速度都趨于穩(wěn)定,而且收斂值與推力系數(shù)無關(guān)；湍流強(qiáng)度越大,尾流的恢復(fù)能力越大；隨著安裝高度的增加尾流恢復(fù)值變大；轉(zhuǎn)子中心地勢越高尾流恢復(fù)越快。 垂直水流方向,初始流速越大,尾流效應(yīng)范圍越大；推力系數(shù)對(duì)尾流效應(yīng)的影響集中在4d范圍內(nèi)；湍流強(qiáng)度與地形對(duì)尾流作用不明顯；不同安裝高度條件下,尾流流速沿橫向變化與其他因素下的速度變化不同,其影響范圍集中在圓盤中心外1d到4d之間。 本文實(shí)驗(yàn)結(jié)果中關(guān)于水平軸潮流能發(fā)電機(jī)尾流效應(yīng)的水動(dòng)力特性規(guī)律,為水平軸潮流能發(fā)電機(jī)的布局提供了參考；采用實(shí)驗(yàn)的方法實(shí)現(xiàn)對(duì)水平軸潮流能發(fā)電機(jī)尾流效應(yīng)進(jìn)行多個(gè)影響因素的二維研究,為進(jìn)一步的研究奠定一定的基礎(chǔ)。
[Abstract]:Tidal energy is a renewable marine resource with great potential, Power flow power generation technology has gradually moved from engineering prototype to commercial application stage. Horizontal axis power flow generator is an important form of power flow generator. Both the flow velocity and the flow direction change behind the generator rotor. This effect on the initial inflow velocity is called wake effect, and the wake effect affects the inlet velocity of the downstream generator rotor, thus affecting the output power of the generator. Therefore, the study of wake effect is an important basis for the optimal layout of horizontal axis power flow generators, which is of great theoretical and practical significance. In this paper, the concept and theoretical basis of horizontal axis power flow generator are introduced. On this basis, different factors affecting the wake effect of horizontal axis power flow generator are discussed. An experimental scheme is designed to study the wake effect of horizontal axis power flow generator, and a flume experiment is carried out. In the experiment, the influence factors (initial velocity, thrust coefficient, turbulence intensity) on wake effect are changed. The wake velocity along the flow direction and the vertical flow direction is measured and the wake effect is studied and analyzed in plane. The experimental results show that:. Along the direction of the flow, the larger the initial velocity, the greater the convergence value of the downstream wake velocity, and the influence of thrust coefficient on the wake flow is concentrated in the range of 5d(d as the rotor diameter of the generator. After 15 days, the wake velocity of different thrust coefficients tends to be stable. The convergence value is independent of the thrust coefficient; the greater the turbulence intensity, the greater the wake recovery ability; with the increase of the installation height, the wake recovery value becomes larger; the higher the rotor center terrain, the faster the wake recovery. In the vertical flow direction, the larger the initial velocity is, the larger the wake effect range is; the effect of thrust coefficient on wake effect is concentrated in the range of 4 days; the turbulence intensity and topography have no obvious effect on wake; The variation of wake velocity along the transverse direction is different from that of other factors, and the influence range is between 1 d and 4 d outside the center of the disk. In the experimental results, the hydrodynamic characteristics of the wake effect of the horizontal axis power flow generator are discussed, which provides a reference for the layout of the horizontal axis power flow generator. The experimental method is used to study the wake effect of horizontal axis power flow generator in two dimensions, which lays a foundation for further research.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P743.3;TM612

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相關(guān)期刊論文 前1條

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本文編號(hào)：1665050