..., it is found that the blades with pitch angle of 4 and 6 degrees give the highest torque, especially in a tip-speed ratio over 1. By changing the pitch angle of the blade from 0 to 6 degrees, the peak value of the power coefficients is improved by more than 30 percent. INTRODUCTION An ocean current...

... and blades are developed to improve efficiency of energy extraction. power coefficient simulation stationary domain immergence renewable energy thrust marine current turbine thrust coefficient computational domain inflow velocity axial velocity distribution efficiency turbine uniform...

... velocity. coefficient power coefficient straight-bladed vertical-axis water turbine tip-speed ratio configuration turbine flap attachment ocean energy lower surface water turbine power generation renewable energy torque coefficient experiment negative torque water tunnel gurney...

... w angular velocity of the rotor, radls N rotating speed of the rotor, rpm tP tip speed ratio ( = L w 12U ) p air density, kg/m3 T shaft torque, N-m P shaft power, N-m/s Ct torque coefficient ( =TI (p U2 AL/4] ) CP power coefficient ( =PI [p U3A/2] ) n efficiency, % 185 INTRODUCTION The Wells turbine...