A Numerical Study on a Vertical-Axis Wind Turbine with Inclined Arms
Figure 10
(a) Instantaneous torque generated during one revolution by one isolated blade (IB-1) and one isolated set of arms (IA-1), along with theoretical (arithmetical sum of blade and arms torques, IB-1 plus IA-1) and actual (FE-1) entire element results. (b) Comparison of vorticity magnitude maps in a plane behind IB-1 (top) and FE-1 (bottom) configurations. (c) Vorticity in a plane behind the FE-1 configuration (free stream coming from lower right). The rotating element is shown in four subsequent positions during one revolution and the dots represent the grid used for the vorticity maps (see Figure 10(b)) and the quantitative evaluation of wake strength (see Table 1(b)).
