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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 郭志禹(Chih-Yu Kuo),張建成(Chien-Cheng Chang) | |
dc.contributor.author | Yu-Hsuan Cheng | en |
dc.contributor.author | 鄭宇軒 | zh_TW |
dc.date.accessioned | 2021-06-13T02:04:26Z | - |
dc.date.available | 2021-12-01 | |
dc.date.copyright | 2011-08-09 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-08-02 | |
dc.identifier.citation | [1] 陳正和. (2006) 風力發電機之應用和效益. 台電月刊. pp.30-36.
[2] J. Pitteloud, 'World Wind Energy Report 2010,' in 10th World Wind Energy Conference &Renewable Energy Exhibition, Cairo, Egypt, 2010. [3] S. N. L. Staff, 'Vertical Axis Wind Turbine:The History of the DOE Program,' Sandia Labs, 1980. [4] J. Strickland, et al., 'A vortex model of the Darrieus turbine: an analytical and experimental study,' Journal of Fluids Engineering, vol. 101, pp. pp.500-505, 1979. [5] M. Islam, et al., 'Aerodynamic models for Darrieus-type straight-bladed vertical axis wind turbines,' Renewable and Sustainable Energy Reviews, vol. 12, pp. 1087-1109, 2008. [6] H. Glauert, The elements of aerofoil and airscrew theory: Cambridge Univ Press, 1926. [7] R. Templin, 'Aerodynamic performance theory for the NRC vertical-axis wind turbine,' NASA STI/Recon Technical Report N, vol. 76, p. 16618, 1974. [8] J. H. Strickland, 'Darrieus turbine: a performance prediction model using multiple streamtubes,' Sandia Labs., Albuquerque, N. Mex.(USA)1975. [9] M. H. Worstell, et al., Aerodynamic performance of the 17-metre-diameter Darrieus wind turbine: Dept. of Energy, Sandia Laboratories, 1982. [10] D. E. Berg, et al., 'Aerodynamic design and initial performance measurements for the SANDIA 34-metre diameter vertical-axis wind turbine,' Wind Energy, vol. 1, pp. 14-17, 1989. [11] G. F. Homicz, 'Numerical Simulation of VAWT Stochastic Aerodynamic Loads Produced by Atmospheric Turbulence: VAWT-SAL Code,' SAND91-1124, 1991. [12] W. P. Wolfe and S. S. Ochs, 'CFD calculations of S809 aerodynamic characteristics,' Sandia National Labs., Albuquerque, NM (United States)1997. [13] A. Iida, et al., 'Numerical Simulation of Unsteady Flow and Aerodynamic Performance of Vertical Axis Wind Turbines with LES,' in 16th Australasian Fluid Mechanics Conference, 2007, pp. 1295-1298. [14] J. Mathieu and J. Scott, An introduction to turbulent flow: Cambridge Univ Press, 2000. [15] R. O. Fox, Computational models for turbulent reacting flows: Cambridge Univ Press, 2003. [16] R. E. Sheldahl and A. Sandia National Labs., NM. Aerothermodynamics Div, 'Comparison of field and wind tunnel Darrieus wind turbine data,' Sandia National Labs., Albuquerque, NM. Aerothermodynamics Div1981. [17] C. J. S. Ferreira, et al., '2D CFD simulation of dynamic stall on a Vertical Axis Wind Turbine: verification and validation with PIV measurements,' AIAA, 2007. [18] P. Svacek, et al., 'Numerical simulation of flow induced airfoil vibrations with large amplitudes,' Journal of Fluids and Structures, vol. 23, pp. 391-411, 2007. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/30463 | - |
dc.description.abstract | 垂直軸風力發電機相較於水平軸風力發電機而言具有無風向限制、齒輪箱置於底座方便作業等優點,因此近年來其成為離岸式風機發展的重點對象,垂直軸風力發電機葉片的空氣動力特性是由複雜的流體與風機葉片之交互作用所主導,葉片受到空氣動力所產生的受力情形主要是隨著旋轉角度變化的相對攻角、雷諾數與速度所造成,屬於暫態的周期性問題,本研究是計算大型風力發電機在穩定轉速下之功率輸出與扭力,應用葉片元素理論以擬定常的方式計算受力情形,數值計算的部分是以ANSYS FLUENT計算流體力學軟體以控制方程式Navier- Stokes方程式來計算紊流場下的受力情形,所使用的紊流場模型為K-epsilon。
本研究針對不同尖端速度比(tsr=3、4、5、6)、葉片數(2、3、4)對風機的功率輸出造成的影響進行探討,並以疏密比(1/30、1/45、1/60)來探討葉片元素理論的適用性。發現尖端速度比等於4時有最大的輸出效率,由動力效應以及黏滯效應共同主導,屬於過度區域,在此區域具有良好的效率;葉片數三葉的風機有最佳的效率,四葉風機則是因為會受到前一葉片產生的干擾使得效率降低;因此葉片元素理論在疏密比小於1/45時數值計算與葉片元素理論的結果相當符合,十分適合運用於大型風機的計算,在大於1/45時則葉片元素理論的結果與數值計算有較大的誤差,需使用數值計算的方式才能達到較準確的結果。 | zh_TW |
dc.description.abstract | VAWTs have the advantages of wind direction with no restrictions and convenient operation .VAWTs become the focus of development of offshore turbines in recent years. The aerodynamic characteristics of vertical axis wind turbines are determined by the complex interactions between the flow and the turbine blades. The complication mainly arises from the change of angle of attack, and Reynolds number of the blade airfoil during rotation and this leads to transient periodic aerodynamic forces on the blade. In this study, we analyze the torque and power output of large-scale wind turbines by using both BEM (Blade Element Method) and numerical method. The parameters of calculations include tip-speed ratio(tsr=3,4,5,6), number of blades(2,3,4), and solidity ratio(1/30、1/45、1/60). We found that the maximum power can be obtained at tsr=4, which is dominated by dynamic effect and viscous effect. The turbine with three leaves have the best power efficiency. When solidity is smaller than 1/45, the results of CFD and BEM are similar. Therefore, BEM is appropriate for prediction of large-scale VAWT. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T02:04:26Z (GMT). No. of bitstreams: 1 ntu-100-R98543072-1.pdf: 3781900 bytes, checksum: 5831fbf2e18ba7ea43b838f2d6f9248f (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 圖目錄 III
第一章 導論 1 1.1 研究背景簡介與動機 1 1.2 研究目的 3 1.3 風機種類介紹 4 1.4 文獻回顧 5 1.5 全文概述 8 第二章 數值方法 9 2.1 簡介 9 2.2 網格產生 9 2.2.1 網格產生時間 10 2.2.2 數值擴散 11 2.2.3 網格品質 12 2.3 流場計算 13 2.3.1 分離求解器 13 2.3.2 空間離散 15 2.3.3 時間離散 20 2.3.4 壓力─速度耦合關係的處理 23 2.4 動態網格 30 第三章 葉片元素理論與控制方程式 33 3.1 葉片元素理論簡介 33 3.2 基本假設 33 3.3 座標系統 33 3.4 葉片元素法 34 3.5 控制方程式 38 3.5.1 守恆定律 38 3.5.2 紊流場控制方程式 39 第四章 結果與討論 41 4.1 BEM驗證與網格測試 41 4.1.1 驗證 41 4.1.2 網格測試 43 4.1.3 BEM邊界條件 44 4.2 CFD驗證與網格測試 45 4.2.1 驗證 45 4.2.2 網格測試 46 4.2.3 CFD邊界條件 47 4.3 綜合比較 49 4.3.1 疏密比(Solidity)之比較 49 4.3.2 葉片截面比較 51 4.3.3 葉片數比較 57 4.3.4 尖端速度比之比較 58 4.4顫振 ………………………………………………………………………….62 4.4.1 旋轉模態 63 第五章 結論與未來展望 67 5.1 結論 67 5.2 未來展望 69 參考文獻 71 | |
dc.language.iso | zh-TW | |
dc.title | 垂直風力發電機之模擬與扭力及效率分析 | zh_TW |
dc.title | Analyzing Aerodynamics of Vertical Axis Wind Turbines with Different Models | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.advisor-orcid | ,張建成(mechang@iam.ntu.edu.tw) | |
dc.contributor.oralexamcommittee | 朱錦洲(Chin-Chou Chu),蘇正瑜(Zeng Yu Su),宮春斐(Chuen-Fei Kung) | |
dc.subject.keyword | 大型垂直軸風力發電機,葉片元素理論, | zh_TW |
dc.subject.keyword | Large scale VAWT,BEM, | en |
dc.relation.page | 81 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2011-08-02 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 應用力學研究所 | zh_TW |
顯示於系所單位: | 應用力學研究所 |
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