The effectiveness of the end plates are measured and compared with the benchmark case, i.e. without end-plate. Computed results show that all end-plates increase the power coefficient of the rotor, among them the circular end-plate does considerably. The rotor with circular end-plate generates positive power coefficient even at tip– speed ratio (TSR) greater than 1.0, whereas the other rotors do not. Circular end-plate increases the power coefficient of the wind turbine by 84% at TSR = 0.6, the TSR corresponding to the greatest power coefficients of all studied rotors, and averagely by 126% in the range 0.4
