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研究生:林宇
研究生(外文):LIN, YU
論文名稱:水平軸離岸風機雙向流固耦合氣動力特性分析
論文名稱(外文):Aerodynamic Prediction of Horizontal-Axis Offshore Wind Turbine via a Two-Way Fluid-Structure Interaction Approach
指導教授:趙修武
指導教授(外文):Shiu-Wu Chau
口試委員:趙修武
口試委員(外文):Shiu-Wu Chau
口試日期:2014-07-17
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:78
中文關鍵詞:氣動力特性雙向流固耦合離岸風機滑動網格法弱耦合法
外文關鍵詞:Aerodynamic characteristicsFluid-structure interactionOffshore wind turbineMoving gridWeak coupling
相關次數:
  • 被引用被引用:3
  • 點閱點閱:329
  • 評分評分:
  • 下載下載:101
  • 收藏至我的研究室書目清單書目收藏:0
本研究中使用雙向流固耦合的數值方法,對完整的NREL 5MW型離岸風機在額定風速(11.4 m/s)和固定轉速(12.1 rpm)的條件下,進行該風機的氣動力特性預測和評估。風機周圍不可壓縮流場計算,是基於求解納維爾史托克斯方程組及k-Omiga紊流模型,利用有限體積法進行控制方程式數值離散,計算過程中採用滑移網格方式模擬風機葉片的旋轉運動。本研究在流固耦合計算中,使用Abaqus計算考慮複合材料特性的葉片變形,使用STAR-CCM+以滑動網格方式模擬葉片的轉動行為,同時進行葉片流固耦合所需資料的映射與傳遞。本研究採用弱耦合的方式處理流固耦合界面,以及運用重新生成網格的方式替換包含葉片之流場網格區塊,以反映葉片變形對於流場的影響。本文分別對剛性和彈性葉片兩種情況進行風機的氣動力特性計算,本研究使用旋轉坐標方式進行流固耦合計算以獲得彈性葉片的穩定變形位置。本研究的計算結果顯示,葉片參考點的平均變形量約為葉片總長度的6.45%左右。與剛性葉片結果相較,考慮葉片變形的風機整體功率輸出下降約9.56%。
This study predicts the aerodynamic performance of the NREL 5MW offshore wind turbine via a two-way fluid-structure Interaction (FSI) approach. This simulations are performed under the rated wind velocity 11.4 m/s and rated rotor speed 12.1 rpm at full scale. The flow field around the wind turbine is computed by solving the Navier–Stokes equations incorporated with the k-Omiga turbulence model, where air is assumed as an incompressible viscous fluid. The equations are discretized using a finite volume method. In this study STAR-CCM+ and Abaqus are employed to solve the FSI problem, where a weak coupling approach is used. A remeshing process is adopted to obtain the required grid quality of sliding grid system as well as the mesh around the deformed blades. The simulation suggests that the deformation of reference point for flexible blade is about 6.45% of the total blade length. while the wind turbine with flexible blades delivers a power decrease by 9.56% when compared with the power delivered by rigid blades.
摘要 I
Abstract II
目錄 III
符號表 V
圖目錄 X
表目錄 XIII
第一章 前言 1
1-1 研究背景 1
1-2 文獻回顧 3
1-3 研究內容與目的 5
第二章 計算方法 6
2-1 流場計算 6
2-1-1 統御方程式 6
2-1-2 紊流模型 7
2-1-3 數值離散方法 10
2-2 流固耦合計算 11
2-2-1 網格變形方法 13
2-2-2 弱耦合方法 14
2-2-3 流固網格映射方法 15
第三章 計算空間與計算條件 16
3-1 三維模型建立 16
3-2 結構參數設定 21
3-3 計算空間與邊界條件設定 23
3-4 旋轉耦合運動模型建立 26
3-5 網格設定 28
第四章 計算結果 33
4-1 葉片流固耦合計算 35
4-2 風機流固耦合計算結果 41
第五章 結論 58
參考文獻 59
附錄A 本研究使用之NREL 5MW型風機葉片結構參數 62
附錄B NREL 5MW風機整機規格 64
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