A Numerical Study on a Vertical-Axis Wind Turbine with Inclined Arms

Table 1

(a) Average 𝐶_𝑃 generated during one revolution by one isolated blade (IB-1) and one isolated set of arms (IA-1), along with theoretical (IB-1 plus IA-1) and actual full element (FE-1) results. (b) Average vorticity magnitude in a vertical plane behind the turbine, orthogonal to the free stream velocity (see Figure 10(c)).

(a)

Case	Average 𝐶𝑃
	Upwind; zone	Downwind; zone	Full; revolution
IB-1	0.220	−0.024	0.098
IA-1	0.096	−0.021	0.038
THEOR	0.316	−0.045	0.136
FE-1	0.261	−0.027	0.117 (−14%)

(b)

IB-1	IA-1	FE-1
0.562 1/s	0.445 1/s	0.913 1/s