Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2534
標題: 具有不同疏密比之垂直風機性能分析
Simulation on Performance of VAWT with Various Solidities
作者: 莊昌儒
Chuang, Chang-Ju
關鍵字: solidity;疏密比;VAWT;CFD;aerodynamic performance;垂直式風機;計算流體力學;空氣動力性能
出版社: 機械工程學系所
引用: [1] Oler, J., Strickland, J., Im, B., and Graham, G., "Dynamic stall regulation of the Darrieus turbine," SAND83-7029. Texas technical university, p. 154, 1983. [2] Migliore, P., "Comparison of NACA 6-series and 4-digit airfoils for Darrieus wind turbines," Journal of Energy, vol. 7, p. 291, 1983. [3] Allet, A., Halle, S., and Paraschivoiu, I., "Numerical simulation of dynamic stall around an airfoil in Darrieus motion," Journal of Solar Energy Engineering, vol. 121, p. 69, 1999. [4] Ackermann, T. and Soeder, L., "Wind energy technology and current status: a review," Renewable and Sustainable Energy Reviews, vol. 4, pp. 315-374, 2000. [5] Fujisawa, N. and Shibuya, S., "Observations of dynamic stall on darrieus wind turbine blades," Journal of Wind Engineering and Industrial Aerodynamics, vol. 89, pp. 201-214, 2001. [6] Mertens, S., Van Kuik, G., and Van Bussel, G., "Performance of an H-Darrieus in the skewed flow on a roof," Journal of Solar Energy Engineering, vol. 125, p. 433, 2003. [7] Van Bussel, G., Mertens, S., Polinder, H., and Sidler, H., "TURBYR: concept and realisation of a small VAWT for the built environment," Proceedings of the science of making torque from wind, pp. 19-21, 2004. [8] Fukudome, K., Watanabe, M., Iida, A., and Mizuno, A., "Separation control of high angle of attack airfoil for vertical axis wind turbines," Proc. 6th KSME-JSME Thermal and Fluids Engineering Conference ed, 2005. [9] Ferreira, C., Van Bussel, G., and Van Kuik, G., "Wind tunnel hotwire measurements, flow visualization and thrust measurement of a VAWT in skew," Journal of Solar Energy Engineering, vol. 128, pp. 487-497, 2006. [10] Hwang, I., Hwang, C., Min, S., Jeong, I., Lee, Y., and Kim, S., "Efficiency Improvement of Cycloidal Wind Turbine by Active Control of Blade Motion," in Icast 2005--Sixteenth International Conference on Adaptive Structures and Technologies: October 9-12, 2005, Paris, France,2006, pp. 282-291. [11] Ferreira, C., Van Bussel, G., and Van Kuik, G., "2D CFD simulation of dynamic stall on a vertical axis wind turbine: verification and validation with PIV measurements," AIAA, vol. 23, pp. 16191-16201, 2007. [12] Iida, A., Kato, K., and Mizuno, A., "Numerical simulation of unsteady flow and aerodynamic performance of vertical axis wind turbines with LES," in 16th Australasian Fluid Mechanics Conference, 2007. [13] Antheaume, S., Ma tre, T., and Achard, J., "Hydraulic Darrieus turbines efficiency for free fluid flow conditions versus power farms conditions," Renewable Energy, vol. 33, pp. 2186-2198, 2008. [14] Islam, M., Ting, D., and Fartaj, A., "Aerodynamic models for Darrieus-type straight-bladed vertical axis wind turbines," Renewable and Sustainable Energy Reviews, vol. 12, pp. 1087-1109, 2008. [15] Kirke, B. and Lazauskas, L., "Variable pitch Darrieus water turbines," Journal of Fluid Science and Technology, vol. 3, pp. 430-438, 2008. [16] Ferreira, C., Van Kuik, G., Van Bussel, G., and Scarano, F., "Visualization by PIV of dynamic stall on a vertical axis wind turbine," Experiments in Fluids, vol. 46, pp. 97-108, 2009. [17] Thumthae, C. and Chitsomboon, T., "Optimal angle of attack for untwisted blade wind turbine," Renewable Energy, vol. 34, pp. 1279-1284, 2009.
摘要: 
本研究係採用數值模擬方式,探討二維垂直風機被動旋轉,在不同入流風速與不同疏密比條件下之性能。本研究的葉片弦長為0.1m,翼型以NACA0012為主,葉片數目為三片。各變化參數如下:葉片旋轉半徑0.4m,不同入流風速為5m/s、10m/s、15m/s。固定入流風速為10m/s,改變不同之旋轉半徑(R=0.3m、0.35m、0.4m、0.6m),則其疏密比分別為0.5、0.428、0.375、0.25。研究結果顯示:翼尖速度比λ在0.2至0.46範圍內,當入流風速越大時,其風機輸出功率越大。當疏密比由0.25增加到0.428時,風機之啟動加速度與平均扭矩也隨之增加。疏密比為0.5時,由於旋轉半徑的縮小,導致在上風區葉片的尾流對於下風區葉片的流場有很明顯的干涉,因此對於整體葉片所受之轉動力矩也有很大的影響。在疏密比為0.428時有最大輸出功率12%。

In this study, the numerical method, employing Fluent/Ansys, is used to simulate the two-dimensional VAWT system driven by the wind. The VAWT system includes three blades separated by along the azimuthal direction. The chord length of each blade is 0.1m, with a airfoil profile of NACA0012. The rotating radius of the VAWT system is 0.4m. Three inflow speeds (5m/s、10m/s、15m/s) are employed to investigate the related aerodynamics of the VAWT system. Also, the effect of solidity on the performance of the VAWT is investigated at inflow speed of 10m/s. The value of solidity is varied by changing the rotating radius of the VAWT system, ranging between 0.25 and 0.5.The result shows that the higher the inflow speed, the larger the output power; and thus the power coefficient. The tip speed ratio ranges between 0.2 and 0.46. As the solidity increases up to 0.428, both the starting acceleration and the driving torque increase. Futher increase of the solidity will reduce the starting acceleration and the driving torque. This decrease is caused by the severe interfere of the wake of upwind with the downwind blades. The maximum power coefficient is found to be 12% at the solidity of 0.428.
URI: http://hdl.handle.net/11455/2534
其他識別: U0005-2508201011093800
Appears in Collections:機械工程學系所

Show full item record
 

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.