由於極端風荷載是造成離岸結構物損壞之主因，再加上歐美風力發電機組非針對台灣多颱風之海象環境所設計，因此，分析台灣海域之極端風力作用於離岸結構物之受風特性，對台灣未來發展離岸風力發電有相當的幫助。
首先本研究利用計算流體力學(Computational Fluid Dynamics)軟體FLUENT模擬參考文獻之風洞試驗結果數據，藉由比對風阻(C_D)及昇力(C_L)係數，確保數值模擬分析流程建立之正確性及可行性後，再利用本研究建立離岸風力發電機組之案例，透過來風角度、極端風速、機艙長寬比三個變因，探討案例之機艙及塔架的受風特性。研究結果發現，當流場雷諾數超過臨界值後，風阻及昇力係數會趨於定值；另外透過縮尺模型模擬足尺(full-Scale)模型時，發現其風阻及昇力係數結果相同，故未來能利用縮尺模型進行模擬，以減少模擬計算時間。雖然機艙之來風風速較塔架大，但整體之最大負風壓值在塔架側風面，故若以機艙作為整體風力發電機組的設計基準，將會低估最大負風壓值。

Several damage surveys indicate many failures of offshore structures because of extreme wind force, and Taiwan’s sea area have high frequency typhoons. Thus, if Taiwan wants to develop offshore wind power, it is important to analyze the characteristics of wind force on offshore wind turbines under extreme wind conditions.

In this thesis, numerical models based on FULENT which is a Computational Fluid Dynamics (CFD) commercial software. First, comparison between numerical results and reference date was carried out to verify the accuracy of the numerical simulation analysis process. Second, establishing the offshore wind turbine’s model and changing some variables to analyze the wind load characteristics how affects the model. Finally, this thesis discussing the characteristics of nacelle obtained by the mean drag & lift coefficients with the variation in angle, and comparing nacelle with tower by wind pressure value.

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