Method and system for calculating aerodynamic force of wind turbine airfoil under different turbulence intensities

A system for calculating aerodynamic force of a wind turbine airfoil under different turbulence intensities, comprising:

• a wind pressure measuring module, configured to measure wind pressure at each pressure measurement point on an airfoil surface of a wind turbine under the different turbulence intensities;
• a lift coefficient and drag coefficient calculating module, configured to calculate a lift coefficient and a drag coefficient for the airfoil according to the wind pressure at each pressure measurement point on the airfoil surface and thus obtain lift coefficients and drag coefficients at the different turbulence intensities;
• a function fitting module, configured to perform function fitting on the lift coefficients and the drag coefficients at the different turbulence intensities, respectively, thereby obtaining a fitted lift coefficient model with an angle of attack as a variable and a fitted drag coefficient model with the angle of attack as a variable at the different turbulence intensities;
• a turbulence intensity calculating module, configured to calculate a turbulence intensity on a wind turbine to be measured according to a height at which the wind turbine to be measured is located;
• and
• a lift coefficient and drag coefficient fitting obtaining module, configured to obtain the lift coefficient and the drag coefficient for the airfoil of the wind turbine to be measured according to the turbulence intensity on the wind turbine to be measured by using the fitted lift coefficient model with the angle of attack as the variable and the fitted drag coefficient model with the angle of attack as the variable at the different turbulence intensities.