Study on time domain method for predicting flutter of large wind turbine blades
With the rapid development of wind power,the problems of failure and damage caused by flutter of blades have gradually attracted extensive attention in researches.Based on the investigation of the current research status and the analysis of the current requirements,a time-domain analysis project solution of blade flutter based on FEM model is established to balance the calculation accuracy and effi-ciency.The fluid-solid weak coupling method is used to describe the aerodynamic load with BEM theory and its reasonably modification.Theodorsen's aerodynamic theory is applied to supplement and modify the unsteady effect in the aerodynamic model.The BEM is used to solve the structural response and estimate the flutter critical condition.The reference WindPACT 1.5 MW blade is used to verify the calcula-tion.The calculation error of flutter velocity is 0.49％compared with the related research results.It has been verified that this method can be comprehensively considered when describing the operation and load conditions of large wind turbine blades,and it is suitable to predict the flutter of more large and flexible blades with nonlinear large deformation.
wind turbine bladeflutter predictingBEM(blade-element and momentum theory)theodorsen's theoryFEM(finite element method)
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