Based on a certain 150 kW variable-speed variable pitch blade, a blade tip profile with arc-shaped forward bending in the direction of the incoming wind and increased torsion angle is proposed to reduce load. The influences of torsion angle increment, bending angle and wind speed on the aerodynamic characteristics of the blade are comprehensively considered, thus a 4×4×4 group of orthogonal experimental geometry models are established. After that, the flow field analysis is completed by the Fluent rotating coordinate system method, with which the parameters such as moment and thrust of each group are obtained. Comparing the simulation results of 16 sets of models, the factor effects are used to evaluate the influence of wind speed, bending angle and torsion angle increment on the aerodynamic characteristics of the blade. The main conclusions are as follows the proposed tip shape has no obvious effect on the blade’s aerodynamic characteristics at wind speed that is far below or above the rated wind speed. Under the rated wind speed of 9 m/s, the blade tip with 10° torsion angle increment and 30° bending angle has the best load reduction characteristics compared with the initial blade, and the axial thrust is reduced by about 6.5% without power loss.
Key words
wind turbines /
blades /
optimization /
flow fields /
orthogonal test
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