Mathematical Analysis of the Effect of Rotor Geometry on Cup Anemometer Response
Figure 4
Normal aerodynamic force coefficient, , of the Brevoort and Joyner Type-II cup [27], plotted as a function of the wind direction with respect to the cup, . The approximation used in the classical simplified model for aerodynamic torque on the anemometer rotor (expression (11)) is also included as a dashed line. See in the attached sketch the idealized approximation to the equilibrium point of the 2-cup analytical model, where , , and, therefore, the rotation speed is constant.
