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This study evaluate the performance of vertical axis hydrokinetic turbine (VAHT) - Helical Blade using duct system. Experimental study has been performed in the open channel with measured current speed of 0.7 m s −1 , 0.9 m s −1 , and 1.1 m s −1 . Rotational speed and torque were measured to obtain the performance factor ( C P ) and tip speed ratio ( TSR ). The gain of current speed has good response on rotational speed and torque. VAHT - Helical Blade using duct system has greater  C P than non-duct system at three different current speed. The maximum  C P is 0.44 reached on TSR of 2.92. The addition of duct system has good response on  C P of VAHT - Helical Blade due to increasing current speed around the turbine.

Performance evaluation of vertical axis hydrokinetic turbine (VAHT) helical blade using duct system for low current speed application