کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
293596 | 511155 | 2013 | 8 صفحه PDF | دانلود رایگان |
• A 1.2 m diameter full scale horizontal axis wind turbine is investigated.
• A fair power coefficient (Cp) of 0.40 achieved despite the small size of the rotor.
• Good agreement of experiments and simulations for peak Cp.
• Simulations underestimate tip speed ratio for peak Cp.
• Tip speed ratio corresponding to peak Cp found to vary inversely with wind speed.
The results of wind tunnel tests performed on a full scale horizontal axis wind turbine with a rotor diameter of 1.2 m are presented, analyzed and compared with those predicted by WT_Perf and Qblade Blade Element Momentum (BEM) codes. The studied rotor, carved in wood, belongs to a family of wind turbines suitable for production by unskilled persons with hand tools, with more than one thousand turbines already produced. The experiments were conducted in a 2×2 m open test chamber closed circuit wind tunnel at wind speeds of 3.0; 3.7; 4.4; 5.5; 7.2; 7.7 m/s and shaft power with varying tip speed ratios (λ) was measured. The maximum experimentally obtained power coefficient (Cp) was found to vary significantly with the wind speed, between Cp=0.32 for 3.0 m/s and Cp=0.40 for 7.7 m/s. The tip speed ratio corresponding to peak power coefficient was found to vary inversely with the wind speed, from λ=6.5 at 3.0 m/s to λ=4.8 at 7.7 m/s. Comparison of the obtained wind tunnel data with the results provided by the two BEM codes was found to be good.
Journal: Journal of Wind Engineering and Industrial Aerodynamics - Volume 123, Part A, December 2013, Pages 99–106