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Simulation on Performance of VAWT with Various Solidities
|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:|| Oler, J., Strickland, J., Im, B., and Graham, G., "Dynamic stall regulation of the Darrieus turbine," SAND83-7029. Texas technical university, p. 154, 1983.  Migliore, P., "Comparison of NACA 6-series and 4-digit airfoils for Darrieus wind turbines," Journal of Energy, vol. 7, p. 291, 1983.  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.  Ackermann, T. and Soeder, L., "Wind energy technology and current status: a review," Renewable and Sustainable Energy Reviews, vol. 4, pp. 315-374, 2000.  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.  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.  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.  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.  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.  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.  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.  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.  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.  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.  Kirke, B. and Lazauskas, L., "Variable pitch Darrieus water turbines," Journal of Fluid Science and Technology, vol. 3, pp. 430-438, 2008.  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.  Thumthae, C. and Chitsomboon, T., "Optimal angle of attack for untwisted blade wind turbine," Renewable Energy, vol. 34, pp. 1279-1284, 2009.||摘要:||
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.
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