소형 수직축 풍력발전기 풍동실험시 폐쇄율의 영향
Effect of Blockage Ratio on Wind Tunnel Testing of Small Vertical-Axis Wind Turbines
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초록
The effect of blockage ratio on wind tunnel testing of small vertical-axis wind turbine has been investigated in this study. Height and rotor diameter of the three blades Darrieus vertical axis wind turbine used in present test were 0.4m and 0.35m respectively. We measured the wind speeds and power coefficient at three different wind tunnels where blockage ratio were 3.5%, 13.4% and 24.7% respectively. The test results show that the measured powers have been strongly influenced by blockage ratio, generally increased as the blockage ratio increases. The maximum power at higher blockage ratio has been obtained at relatively high tip speed ratio compared with that at low blockage ratio. The measured power coefficients under high blockage ratio can be improved from proper correction using the simple correction equation based on blockage factor. In present study, the correction error for power coefficient can be less than 5%, however correction effectiveness reveals relatively poor at high blockage ratio and low wind speed.
Abstract
The effect of blockage ratio on wind tunnel testing of small vertical-axis wind turbine has been investigated in this study. Height and rotor diameter of the three blades Darrieus vertical axis wind turbine used in present test were 0.4m and 0.35m respectively. We measured the wind speeds and power coefficient at three different wind tunnels where blockage ratio were 3.5%, 13.4% and 24.7% respectively. The test results show that the measured powers have been strongly influenced by blockage ratio, generally increased as the blockage ratio increases. The maximum power at higher blockage ratio has been obtained at relatively high tip speed ratio compared with that at low blockage ratio. The measured power coefficients under high blockage ratio can be improved from proper correction using the simple correction equation based on blockage factor. In present study, the correction error for power coefficient can be less than 5%, however correction effectiveness reveals relatively poor at high blockage ratio and low wind speed.
참고문헌 (12)
- "IEC 61400-2, Wind turbine generator systems-Part2 : Safety of small wind turbines", ~ (2004)
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- S. Hirai, "Wind loads investigations of HAWT with wind tunnel tests and site measurements", Paper Presented in Wind Power Asia (2008)
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- M.A. Kamoji, "Performance tests on helical Savonius rotors", Renewable Energy, 34, pp.521~529 (2008)
- I. Ross, "Wind tunnel blockage corrections:Review and application to Savonius vertical-axis wind turbines", Journal of Wind Engineering and Industrial Aerodynamics, 99, pp.523~538 (2011)
- K.P. Cho, "A Study on blockage effects of vertical axis wind turbines", 16(3), pp.117~223 (2012), The Wind Engineering Institute of Korea
- C.K. Choi, "Wind tunnel blockage effects on aerodynamic behaviors of square section", 3(1), pp.89~98 (1999), The Wind Engineering Institute of Korea
- J.B. Barlow, "Low-speed wind tunnel testing" (1999), John Wiley & Sons, Inc.
- ASCE Standard, "Wind tunnel testing for buildings and other structures", ~ (1997)
- H.S. Kang, "Direct mechanical torque sensor for model wind turbines", 21(10) (2010), Measurement Science and Technology
- "IEC 61400-12-1, Windturbines- Part 12-1 Power performance measurements of electricity producing wind turbines", ~ (2005)