【摘要】：潮流能是一種不竭的清潔可再生資源,研發(fā)潮流能發(fā)電技術(shù)與裝置具有重要的戰(zhàn)略意義和顯著的社會經(jīng)濟(jì)效益。潮流能捕獲機(jī)構(gòu)是潮流能發(fā)電系統(tǒng)的核心,葉輪是潮流能捕獲機(jī)構(gòu)的關(guān)鍵部件,在葉輪外部設(shè)置導(dǎo)流罩以增加潮流流速是提高葉輪獲能效率的一種有效方法。在對國內(nèi)外潮流能捕獲機(jī)構(gòu)中葉輪的各種型式進(jìn)行分析的基礎(chǔ)上,主要對導(dǎo)流裝置的型式進(jìn)行了研究,在現(xiàn)有內(nèi)導(dǎo)流方法的基礎(chǔ)上提出了外導(dǎo)流概念和方法。運用CFD方法及相關(guān)軟件工具對三種流線型導(dǎo)流曲線進(jìn)行了流體動力學(xué)分析,并選取圓弧形為優(yōu)化導(dǎo)流線型,對內(nèi)導(dǎo)流和外導(dǎo)流兩種導(dǎo)流流場進(jìn)行了流體動力學(xué)仿真分析。分析結(jié)果表明,內(nèi)導(dǎo)流聚流效果明顯;外導(dǎo)流的最大潮流增速效果為內(nèi)導(dǎo)流的65%左右,且經(jīng)過外導(dǎo)流后,沿垂直并在離開導(dǎo)流罩壁面方向的潮流速度分布呈現(xiàn)先遞增后遞減趨勢,存在負(fù)獲能區(qū)的葉輪可以充分利用這一特點來提高獲能效率。為了驗證內(nèi)、外導(dǎo)流分析結(jié)果的正確性,基于實驗室水池條件和相對運動原理,設(shè)計制造了潮流能捕獲葉輪導(dǎo)流裝置及其水動力學(xué)性能試驗系統(tǒng),并對水平軸和垂直軸葉輪及其導(dǎo)流罩的性能進(jìn)行了實驗測試,為進(jìn)一步開展海上試驗提供初步依據(jù)及技術(shù)參考。根據(jù)內(nèi)、外導(dǎo)流原理及其性能特點,提出了一種將內(nèi)、外導(dǎo)流集成于一體的雙體船式新型導(dǎo)流結(jié)構(gòu),設(shè)計建造了漂浮雙體船式潮流能捕獲與發(fā)電、制淡綜合實驗平臺,并基于該實驗平臺進(jìn)行了海上試驗,對船體導(dǎo)流效果進(jìn)行了實驗測試。實驗測試結(jié)果表明,該雙體船式導(dǎo)流結(jié)構(gòu)的聚流效果明顯,其內(nèi)導(dǎo)流使潮流流速提高了38%,其外導(dǎo)流使潮流流速提高了23%,且實測導(dǎo)流效果與仿真導(dǎo)流數(shù)據(jù)吻合得較好。
[Abstract]:Power flow energy is an inexhaustible clean and renewable resource. It is of great strategic significance and significant social and economic benefits to develop power generation technology and equipment. Power flow energy capture mechanism is the core of power flow energy generation system and impeller is the key component of power flow energy capture mechanism. It is an effective method to improve the efficiency of impeller energy acquisition by setting a guide cover outside the impeller to increase the power flow velocity. Based on the analysis of various types of impellers in tidal current energy trapping mechanism at home and abroad, this paper mainly studies the types of diversion devices, and puts forward the concept and method of external diversion on the basis of existing internal diversion methods. Using the CFD method and related software tools, the hydrodynamic analysis of three kinds of streamline flow curves is carried out, and the circular arc is selected as the optimization flow guide. The hydrodynamic simulation analysis of the internal and external diversion fields is carried out. The results show that the effect of internal diversion is obvious, and the maximum tidal current growth rate of external diversion is about 65% of that of internal diversion, and after external diversion, The distribution of tidal current velocity along the vertical direction and in the direction of the direction away from the wall of the diversion cover shows a tendency of increasing first and then decreasing. The impeller with negative energy gain region can make full use of this characteristic to improve the efficiency of energy acquisition. In order to verify the correctness of the analysis results of internal and external diversion, based on the conditions of laboratory pool and the principle of relative motion, a flow guide device for capturing the power flow energy of impeller and its hydrodynamic performance test system are designed and manufactured. The performance of horizontal and vertical shaft impellers and their diversion covers are tested experimentally, which provides a preliminary basis and technical reference for further offshore tests. According to the principle of internal and external diversion and its performance characteristics, a new type of catamaran structure is proposed, which integrates internal and external diversion, and a comprehensive experimental platform is designed and constructed to capture and generate power from floating catamaran. On the basis of the experimental platform, a sea test was carried out, and the effect of ship diversion was tested. The experimental results show that the confluence effect of the catamaran diversion structure is obvious. The inner diversion increases the tidal current velocity 38%, and the external diversion increases the tidal current velocity 23%, and the measured flow diversion results agree well with the simulated diversion data.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P743

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相關(guān)碩士學(xué)位論文 前1條

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本文編號：2209055