Airfoil design for wind turbines based on static-aeroelastic performance

The static-aeroelastic performance is introduced,which investigates the sensibility of the aerodynamic torque and intensity of the translational displacement due to the torsional displacement, and less sensibilities and/or intensities means better static-aeroelastic performance. The optimization model is constructed combining the improved particle swarm optimization and the parameterized expression of airfoil based on general integration theory,and with the aerodynamic and static-aeroelastic performances both in consideration. An alternative optimal design for the frequently-used thin airfoil NACA 64618 is conducted using the optimization model. The aerodynamic performance and static-aeroelastic performance are improved in comparing to NACA 64618. Using NREL 5MW wind turbine blade as reference, the NACA 64618 is replaced by a new airfoil which is simulated under the rated conditions with a sine-shape pulse embedded in the wind speed. The new blade shows less sensitivities to the pulse,and it's torsional displacement closer to zero. These mean that the new airfoil can inhibit the torsional divergency of blade in some degree. © 2020, Solar Energy Periodical Office Co., Ltd. All right reserved.