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研究生:柯淳
研究生(外文):Chun Ko
論文名稱:應用體積力方法計算水平軸風車於非定常流中之流場
論文名稱(外文):Computations of the Unsteady Flows Past Horizontal Axis Wind Turbines Using Body Force Method
指導教授:辛敬業辛敬業引用關係
指導教授(外文):Ching-Yeh Hsin
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:系統工程暨造船學系
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:2013
畢業學年度:101
語文別:中文
論文頁數:60
中文關鍵詞:風車體積力方法葉片元素動量法制動片方法邊界元素法
外文關鍵詞:wind turbinebody force methodblade element momentum methodactuator sector methodRANSboundary element method
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風力發電機是最普遍被用來擷取風能的裝置,在不同型態的風車中,浮體式離岸風車雖仍處於發展階段,但具有很大的潛力成為經濟的電力來源。為了要分析浮體式離岸風車因風浪所造成的非定常氣動力,一般都使用非定常流RANS方法計算,但其花費的計算資源相當龐大。本論文發展一應用制動片模型的體積力方法,提供一有效率的計算工具,用來計算風車於非定常入流時的非定常受力。為了確認制動片體積力方法計算流場的準確性,我們首先利用其計算一斜軸螺槳的流場,並將計算所得上下游速度與螺槳非定常流邊界元素法進行比較和驗證,發現其計算結果趨勢一致。接著,我們將非定常流制動片方法應用於單支風車的流場計算,並與非定常流RANS方法計算真實風車幾何做比較,從中發現時間步的選擇與計算結果有相當大的關係。最後,我們將非定常流制動片方法應用於風車非正向入流的流場計算上,計算結果符合真實的物理現象。在未來的研究中,希望將此方法延伸至不同的應用,例如非定常入流的風田流場分析等,更期待與相關的實驗資料進行比對,以提高此方法預估的精準度。
Wind turbine is the most common device to extract wind energy. Among many types of wind turbines, the floating offshore wind turbine, though still in the development stage, has a high potential to become a device to provide economic energy. In order to analyze the unsteady aerodynamic forces of floating offshore wind turbine due to wind and wave, we generally use unsteady RANS methods for unsteady flow calculations. However, it is complicated and time consuming. In this paper, we have developed a body force method based on the actuator sector model which can efficiently compute the unsteady forces of wind turbines in unsteady inflows. In order to confirm the accuracy of actuator sector body force method, we first use this method to compute the flow field of an inclined shaft propeller, and the computational results are compared to the results from a boundary element method. The trends of results from two methods are close. We then apply this method to the computations of wind turbine flow field, and compare the results to those of real geometry by unsteady RANS method. It is found that the selection of time step size is critical to the computational results. Finally, we use actuator sector body force method to compute the flow field of a wind turbine in an oblique inflow, and the results reflect the physical phenomena. In the future research, we hope to extend the present method to different applications, such as analysis of wind farm in unsteady inflow. The comparison of the computational results to the experimental data is expected to confirm the accuracy of this method.
中文摘要 I
英文摘要 II
謝誌 III
目次 IV
圖次 V
表次 VII
第一章 緒論 1
1.1前言 1
1.2文獻回顧 2
1.2.1風車性能的計算方法 2
1.2.2計算風車流場的耦合方法 3
1.2.3偏航狀況下的風車性能 4
第二章 理論與方法 9
2.1葉片元素動量理論 9
2.1.1動量理論 9
2.1.2葉片元素理論 11
2.1.3葉片元素動量理論 12
2.2耦合黏性流計算方法:體積力方法 13
2.2.1制動盤方法 14
2.2.2制動線方法 14
2.2.3制動片方法 15
第三章 計算方法與驗證 21
3.1 RANS計算之網格配置 21
3.2計算流程 22
3.3結果驗證與探討 22
第四章 計算結果與討論 33
4.1單支風車之流場計算 33
4.1.1網格配置和計算條件 33
4.1.2計算流程 34
4.1.3時間步之探討 34
4.1.4計算結果與探討 35
4.2偏航情況下的流場計算 36
4.2.1計算方法 36
4.2.2計算結果與探討 36
第五章 結論與展望 58
參考文獻 59

[1] Abedi, H., Davidson L., Voutsinas S., “Vortex method application for aerodynamic loads on rotor blades”, 8th PhD Seminar on Wind Energy in Europe, ETH Zurich, 2012.
[2] Adaramola, M.S., Krogstad P.-Å., “Experimental Investigation of Wake Effects on Wind Turbine Performance”, Renewable Energy, Vol 36: 2078-2086.
[3] Cater, J. E., Norris, S. E., Storey R. C., “Comparison of Wind Turbine Actuator Method Using Large Eddy Simulation”, 18th Australasian Fluid Mechanics Conference, 2012, Launceston, Australia.
[4] Froude, RE., “On the part played in propulsion by difference in pressure.”, Transaction of the Institute of Navel Architects., 1889,390-423.
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[9] Haans, W, Kuik, G.A.M. van, Bussel G.J.W van, “Experimentally Observed Effects of Yaw Misalignment on the Inflow in the Rotor Plane”, Journal of Physics: Conference Series, 75(1), 012012.
[10] Ivanell, S., Mikkelsen, R., Sørensen, J. N., Henningson, D., “Three dimensional actuator disc modeling of wind farm wake interaction”, EWEC, Brussels, 2008.
[11] Ke, Jason, Hsin, Ching-Yeh, Tseng, I-Hui and Tsai, Ya-Lin,“Apply the Body Force Method to the Computations of Wind Turbine and Marine Current Turbine Flow Field”, The 5th PAAMES and AMEC2012, Dec. 10-12, 2012, Taipei, Taiwan.
[12] Li, Yuwei, Paik, Kwang-Jun, Xing, Tao, Carrica P. M., “Dynamic overset CFD simulations of wind turbine aerodynamics”, Renewable Energy 37, 285-298, 2012.
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[14] Mikkelsen R., “Actuator disc method applied to wind turbines”, Ph.D, Fluid Mechanics Department of Technical University of Denmark, 2003.
[15] Rakine, W.J.M., “On the mechanical principle of the action of propellers”, Transaction of the Institute of Naval Architects, 13-39, 1865.
[16] Sørensen, J. N., Shen, W. Z., “Numerical modeling of wind turbine wakes”, Journal of Fluid Engineering 124:393–399, 2002.
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[18] Troldborg, N., Actuator Line Modeling of Wind Turbine Wakes, Ph.D. thesis, Technical University of Denmark, 2008.
[19] Troldborg, N., Gaunaa, M., Guntur, S., “Modelling the influence of yaw using a simple vortex rotor model”, Proceedings of EWEA 2012.
[20] Tseng, I-Hui, Hsin, Ching-Yeh, Wei, Wei-Che, Cheng, Hsun-Jen and Tsai, Ya-Lin Tsai, “Applying the Body Force Method to the Simulation of Flow around a Horizontal Axis Marine Current Turbine”, The 6th Asia-Pacific Workshop on Marine Hydrodymics (APHydro2012), Sep. 3-4, 2012, Malaysia.
[21] 曾益慧, “應用體積力分析風力發電機葉片流場”, 國立臺灣海洋大學

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