Effect of Rear Rotor Blade Number on the Performance of a CO-DRWT

In this paper, we introduce wind energy and wind turbines by highlighting the unconventional wind turbines e.g., the Counter-Rotating Dual Rotor Wind Turbines (CO-DRWT). For our research, we used a CO-DRWT with different blade numbers at the rear rotor. We run CFD studies to determine the power coefficient
$\boldsymbol{(c_{p})}$
for each CO-DRWT. Based on our simulations' result we find that higher
$\boldsymbol{c_{p}}$
was generated with the three-blade configuration. Then we changed the tip speed ratio of the CO-DRWT, where with a lower tip speed ratio the overall power coefficient
$\boldsymbol{(c_{p})}$
increased. With these studies, we find similarities between a Single Rotor Wind Turbine (SRWT) and a Counter-Rotating Dual Rotor Wind Turbines.