Research On Aerodynamic Performance Of Low Wind Speed Small Wind Turbine Rotor With Varying Solidity

Low wind speed regions in our country account for a relatively high proportion.It accounts for 68%of the total area of available wind resources.Therefore,the optimization design of wind turbine rotors with low wind speed operation as the goal is carried out.Numerical simulations and in-truck tests are used to study the effect of solidity changes on the aerodynamic performance of low-wind speed wind turbines.The design of wind turbine rotors suitable for operation in low wind speed areas will help improve the wind energy utilization efficiency of wind turbines in low wind speed areas.details as follows:1.Through theoretical analysis,the solidity optimization design model of low wind speed wind turbine rotor was established.The multi-objective genetic algorithm was used to optimize the design with the highest starting torque and power coefficient as the goal,and the chord length and setting angle as variables.The optimized solidity is 12.25%.2.The traditional method Wilson method is used to optimize blade a.And according to the characteristics of low wind speed blades,blade b was designed with reference to special blades for concentrated wind energy turbines.The Fluent software was used to simulate the aerodynamic performance of wind rotors with different chord lengths and different numbers of blades at low wind speeds.It is concluded that the blade b is easier to start at the same wind speed.3.The aerodynamic performance test of blade a with different blade numbers and blades a,b with different blade setting angles was carried out through the in-truck tests.It is concluded that with the increase of the solidity,the influence of the setting angle on the aerodynamic performance of wind turbines increases.The setting angle has a smaller influence on the solidity,and the main reason why the output power of the wind turbine changes greatly under different setting angles is mainly due to the effect on the tip speed ratio.4.Under the same conditions,the maximum difference between the test output power and the numerical simulation output power is 5.37%.This shows that the numerical simulation result is credible.With the increase of the solidity,the power coefficient of the rotor at 5 m/s wind speed shows an increasing trend,and the power coefficient shows a decreasing trend at 8 m/s wind speed.When the two trends intersect,the solidity is 25.38%.Choosing a five-blade rotor composed of blade b with blade setting angle of 0° and solidity of 25.38%can obtain a rotor with higher aerodynamic performance at low wind speeds.