| 摘要(英) |
Development of offshore wind power has almost become a trend. There are many of the best offshore wind farms located in Taiwan. However, Typhoons and earthquakes happened frequently in Taiwan, which obstructs international offshore wind power technology being transferred to Taiwan directly. We used commercial software ANSYS Fluent to build a model to analyze aerodynamic load of wind turbine in uniform flow conditions. Results of the simulation were compared with NREL Phase VI wind tunnel experiments, which include 0°, 3°, 6° three different pitch angles and 7 m/s, 10 m/s, 15 m/s, 20 m/s, 25 m/s five different inlet velocities. The streamline, pressure coefficient, normal force coefficient, tangential force coefficient, lift force coefficient, drag force coefficient, flap bending moment, edge bending moment and low speed shaft torque were investigated. The simulation results are accurate enough at the low wind speed conditions. On the other hand, when the angle of attack increases as the wind speed increase, stall phenomena happen. The results show that simulation is not accurate enough to predict the timing of stall and the flow behavior after the stall occurs. |
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