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

Abstract

Abstract 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.