Study on Clearance Calculation Method of Large Wind Turbine Blades
The growth of wind turbine capacity is accompanied by the continuous increase in blade size and flexibility,which is prone to cause blade sweeping.Taking a 108-meter long blade as the research object,various computational methods for calculating the aerodynamic load and structural response of the blade were compared,and the influencing factors of the blade clearance distance were studied.Based on the BEM theory of leaf element momentum and CFD calculation of blade load,the load defor-mation of the blade was calculated using both multi-body dynamics(MED)and beam finite element methods.The results showed that the load on the middle section of the blade calculated using BEM was larger than that calculated using CFD,and the overall distribution of load was more uniform.The MED method was more accurate than the 1D beam element method modal analysis result,but the de-formation degree of the blade calculated by both methods was comparable.The relationship between blade deformation and load was monotonically increasing and proportional,with a decreasing trend as stiffness increased.Therefore,the BEM method combined with multi-body dynamics method can be used for large-scale blade clearance calculation in engineering,and the calculated value is relatively conservative.
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