The Simulation And Wind Tunnel Test Of Wind Turbine Rotor Aerodynamic Characteristics

To study the wind turbine rotor aerodynamic characteristics, simulation and wind tunnel test were taken.Then compare the blade design methods at home and broad, take into account the blade’s tip losses, choose the Wilson design model and the blade design process is compiled by using MATLAB to calculate the chord length and twist angle at different section which are fitted for processing.Through the simulation of special low wind speed airfoil for wind turbine and traditional airfoil, results show that under the same low Reynolds number the special low wind speed airfoil for wind turbine has better aerodynamic performances. It provides a reference for the further research on special low wind speed airfoil for wind turbine.The wind turbine rotor simulation model was established and simulated under the conditions corresponding to the wind tunnel test. The simulation results are consistent with the results of wind tunnel test and prove the feasibility of the wind turbine rotor simulation model.A test method is put forward to reduce the impact caused by the dead weight of blade on the blade root strain. Before the test, the axis of the blade with strain gauges should keep vertically downward or upward. Then make the full bridge zero balance in the imc CANSAS software to minimize the influences on the strain measured. Set the mean value in a period of time as the strain which can offset the most impact caused by the dead weight of blade on the results.From the view of the blade root strain curve, at the initial phase, the variation of strain is large and varies based on a constant value and keeps balanced. After the rotor starts to rotate, the blade root strain shows a decreasing trend with the increasing rotational speed due to the increasing centrifugal force caused by the dead weight of blade. However, the strain measured is a relative value and can not contribute to calculating the absolute stress of the blade root.The minimum cut-in wind speed of the tested wind turbine is7.8m/s at the pitch angle45degree; the maximum is13.9m/s at the pitch angle0degree. The minimum of the maximum stopping wind speed is5.96m/s at the pitch angle35degree; the maximum is11.42m/s at the pitch angle0degree. The large differences between the cut-in wind speed and the maximum stopping wind speed illustrates that static friction or moment caused by the quality imbalance of the rotor exists in the drive train of the wind turbine. It consumes part of energy to make the rotor rotate from still. The results prove that wind turbine rotor can get a large torque at a large pitch angle.