Abstract
Abstract The main objective of this research is to investigate the effect of attaching nozzle lens with difference diameter and number of blades in non-twisted NACA 4415 on the power output of the Horizontal Axis Wind Turbine (HAWT). The Artificial of low wind speed were used in this experiment at 2.5 m/s, 3.5 m/s, and 4.5 m/s. The result shows that the lenses increase the power output. The lens diameter is directly proportional to the rotor speed and TSR of the turbine. In the difference number of blades, the three-blades turbine consistently generates the highest power output compared to two-blades and four-blades turbines. The evidence has established that nozzle lenses and three-blades turbine can successfully increase the efficiency of wind turbines in areas where wind speed is low.
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