浮游式海流渦輪機錨繫狀態下之繫纜張力分析

Analysis of Mooring Line Tension for a Floating Current Turbine

黃聖翔(Sheng-Hsiang Huang)

指導教授 ： 邱逢琛

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.10998

摘要

為開發黑潮發電以擷取可觀之海洋再生能源，如何將水下浮游式海流渦輪機組錨繫於深水海底而能穩定浮游並發電，將成為這項技術最大的挑戰之一。為能控制浮游式海流渦輪機於設定水深，並於必要時能浮出水面或深潛，其系統外觀將一如一般水下載具，包含可提供靜浮力的胴體(機體)，可提供動升力的翼及控制面，擷取和轉換能量的旋轉葉片及包含發電機在內的機艙等元件組成；此外藉由纜與錨所構成的錨繫系統將之固定於海底。本研究在於探討浮游式海流渦輪機在穩定海流流速下之繫纜張力。海流渦輪機之流體動力是應用CFD軟體 ANSYS-FLUENT進行計算，而繫纜之數學模式引用有限元素模式(Finite Element Model)予以建構。海流渦輪機及繫纜所構成之力學系統之平衡方程式求解，則應用程式軟體MATLAB撰寫。本研究以海流流速1.5 m/s時，額定輸出0.5 MW為一機組之系統為例進行探討，且一機組是由左右配置而對轉的葉片所組成，本研究探討在穩定海流作用下，該浮游式海流渦輪機組的受力及繫纜的形狀和張力。

關鍵字

繫纜 ； 海流渦輪機 ； 流體動力係數 ； 計算流體力學

並列摘要

In order to harvest Kuroshio Current energy, anchoring and mooring technology of floating marine current turbines is one of the key challenges. A floating marine current turbine needs to float stably at a proper depth for generating power steady, and also needs to go up to the surface for maintenance, or even to go down deeper to avoid the influence of waves caused by Typhon. Therefore, in addition to rotor and nacelle for harvesting energy, it may look similar to an underwater vehicle with a fuselage for offering static buoyancy, wing and control surfaces for offering dynamic lift. Besides, it is connected by a wire or rope to the anchor, which is fixed at the seabed.
In the present study, the tension forces of the mooring line for a marine current turbine floating in a steady current of constant speed is investigated. CFD software ANSYS-FLUENT is adopted to calculate the hydrodynamic forces of the turbine, and Finite Element Model is applied to simulate the mooring line. The force equilibrium equations of the whole system including the turbine and mooring line are solved by a program of MATLAB. The rated power of the simulated turbine with counter rotating twin rotors at current speed of 1.5 m/s is about 0.5 MW. Steel wire and polyester rope are investigated as the mooring line in the present study.

並列關鍵字

Mooring Line ； Marine Current Turbine ； Hydrodynamic Coefficient ； CFD

參考文獻

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