**9. Results: Torque & Cp**

In this section, the numerical results of the generated torque and power coefficient will be presented here. As per our earlier section on one-dimensional momentum theory, the power present in the wind for a wind speed of 12 m/sec and a blade length of 31 m (from root to tip alone, the root to hub center is 4 m) is:

$$P\_{wind} = 0.5 \ast 1.225 \ast 12^{3 \ast} \,\pi \ast 31^2 = 3193764.336 W \tag{26}$$

The results are presented in **Table 3**. The following can be noted from the tabular results:

	- 9 TSR. This value is slightly higher than the one obtained for the pitch of

*Fluid Dynamics Simulation of an NREL-S Series Wind Turbine Blade DOI: http://dx.doi.org/10.5772/intechopen.107013*

#### **Figure 13.** *Pressure contours of blade root (S815) for varying pitch and TSR.*

5 degrees, TSR 7, which is our optimal angle of attack (approximately 5.25). The twist angle was computed, and 5.25 degrees was subtracted to give the twist for a 0-degree pitch [11, 12] provides a maximum computed Cp for a 2 MW blade as 0.4436 (not through CFD). Although with minor deviations, our values are still very close.


**Figure 14.** *Pressure contours of blade tip (S826) for varying pitch and TSR.*
