| Today's society is facing with severe energy and environmental problems,The search for green and environmentally friendly renewable energy has become an inevitable trend.As a recyclable clean energy,wind energy has gradually drawn the close attention of human kind.And wind power generation will grow vigorously.Wind turbines often operate in a desert environment,wind turbine blades will be subject to erosion by the impact of wind-blown sand,which affects the aerodynamic characteristics of the wind turbine and reduces the generated energy of the wind turbine.In this paper,the scaling model of the NREL Phase VI wind turbine blades is used as the research object to study the influence of wind-blown sand on the erosion and aerodynamic characteristics of wind turbine blades.The effects of different blade tip speed ratios,different particle diameters,and different particle shapes on the erosion and aerodynamic characteristics of wind turbine blades were analyzed.And the three-dimensional effect of blade tip on blade tip erosion characteristics were analyzed.The main conclusions are as follows:(1)The effect of blade tip speed ratio on the erosion of wind turbine blades.As the blade tip speed ratio decreases,the erosion area of the pressure surface gradually spreads from the blade tip to the blade root along the blade span,and gradually spreads from the leading edge to the trailing edge along the chord direction,and the degree of erosion gradually decreases.The tip speed ratio also has a significant effect on the suction surface of the blade.With the decrease of the tip speed ratio,the erosion area of the suction surface is more concentrated on the leading edge position,and there is almost no erosion at other positions,and the amount of erosion at the leading edge of the blade Also gradually reduced.(2)The effect of blade tip speed on the aerodynamic characteristics of wind turbines.As the blade tip speed ratio decreases,the p ower change trend of the wind turbine is to increase first and then decrease.After adding 50?m particles,the change trend of the power of the wind turbine with the blade tip speed ratio is the same as that of clean air,but the addition of particles caus es the power of the wind turbine to decrease slightly.The power loss at ? = 4 is the smallest,reaching 0.069 %.The power loss is greatest at ? = 8,up to 0.325%,and the overall impact is small.With the change of the blade tip speed ratio,the central vortex of the wind turbine changes significantly.When ? = 4,the central vortex at 1D from the plane of the wind wheel is distributed in an “S” shape.The wake vortex continues to dissipate and expand.(3)Effect of particle diameter on wind turbine blad e erosion and aerodynamic characteristics.As the particle diameter increases,the erosion area along the chord direction of the blade gradually diffuses from the leading edge to the trailing edge,and along the span of the blade,the erosion area gradually diffuses from the tip to the root,and there is a diagonal line from the tip to the root The line runs through the blade pressure surface.Compared with clean air,when adding small particles,the power of the wind turbine shows a downward trend,which h as a greater impact on the power loss of the wind turbine,up to 1.539%.When adding large particles,the wind turbine When the particle size is greater than 50?m,the power of the wind turbine changes very little with the particle size.When the particle diameter is 100?m,the power loss of the wind turbine is less affected.(4)Effect of particle shape on wind turbine blade erosion and aerodynamic characteristics.Compared with spherical particles,non-spherical particles cause greater erosion on wind turbine blades.For non-spherical particles,cubic particles and octahedral particles have more significant erosion on the cross-sectional airfoil.But the shape of the particles changes little Will affect the blade erosion area.As the shape factor increases,the power of the wind turbine increases,and the power loss caused by the non-spherical particles to the wind turbine is about 0.233% at the maximum,but the overall impact is small.(5)The three-dimensional effect of the blade tip affects the amount of erosion on the blade tip of the wind turbine.The amount of erosion gradually increases from the blade root to the blade tip,but from the radial position of the wind turbine blade at about 0.986 R,the amount of erosion shows a downward trend due to the three-dimensional effect of the blade tip. |
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