This video shows the design and CFD of a Savonious turbine. The results showed that around the the turbine, winds can reach up to 90 MPH while the turbine spins at 116 RPM. This require further analysis.
The simulation predicts that at 116 RPM (12.2 rad/sec) and a wind speed of 6 m/s (13.7 miles/hr) , a torque of about 2.2 NM can be obtained...Hence, about 26.8 watts ( 12.2*2.2). As per the wind speed of 6 m/s, the ideal power generation is about:
P = 0.5 *density* Area* windspeed^3,
P = 0.5*1.25 * 1.192*.914*6^3 = 147 watts .
The 147 watts is the ideal power generation. If we divide 26.8/147 *100 = 18 %.
