| On the basis of the wind tunnel experimental study and six blades 600W CWET(Concentrated Wind Energy Turbine), this research focus on the study of stalled regulation rotor, apply aerodynamics theory and contrast method, conduced the design parameters of the 3-blades,5-blades and 6- blades rotors for normal 300W wind turbine with diameter 1.8m, to make sure the three kinds of rotors have the same solidity their corresponding chord length is changed, appropriate modification of twist angle was made meanwhile for corresponding location .Set the three kinds of blades under different fix angles ,and used outside in truck test to carry power output characteristic-test, in order to study the effect of blades'quantity and fix angle on power output characteristic and stalled regulation performance. The test results show that: the 3-blades, 5- blades and 6- blades rotors started at wind speed of are 2.01m/s,1.83m/s and 1.68m/s, and reached rated powers at 10.54m/s ,10.53m/s and 10.18m/s ,the three rotors aren't stalled. It shows on the precondition of same solidity, under small fix angles, there is little effect of blades'quantity seducement on turbine's characteristics of start, output and stall. At the same time, when the fix angle of 3-blades, 5- blades and 6- blades rotors up to 30 degree, the turbine's output performance have obviously dropped and reached the rated powers at wind speed of 12.42m/s, 14.30m/s and 13.52m/s, but the output of 3-blades rotor is better than 5-blades and 6-blades rotors. So the over increased fix angle aiming to improve the stall characteristic, will severely affect turbine's output performance. Reduced blades number and increased fix angle, can make the rotors'power output characteristic and stalled characteristic more compatible. This research has established theory and technology basis for the further developing of stalled regulation rotors designs, and provided studying basis for simplifying structure and reducing cost. |
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