ANALISA PENGARUH PERUBAHAN PANJANG CHORD DAN KETEBALAN BLADE PADA TURBIN PEMBANGKIT TENAGA ARUS DENGAN METODE CFD

Abstract

Indonesia as an archipelagic country has territorial waters wider than the land, so the Indonesian seas provide a very large alternative energy, such as energy produced from ocean currents. This energy can produce a very large kinetic energy and environmentally friendly.

During this ocean current energy generation power that has developed and patented a type of Darrieus Water Turbine propulsion and turbine vertical Axiz kobolt. In this study, using a turbine with NACA 0018 foil type, by modifying the NACA 0018 foil with changing chord length and thickness of the blade to get a big lift and drag are smaller than the foil using a standard numerical method Computational Fluid Dynamics (CFD).

Single foil modified by reducing the thickness of the blade to be at 50%, 80%, 95% decline in the value of CL and the ratio CL / CD. While the modifications with the addition of a chord of 5%, 10%, 15% an increase in the value of CL and the ratio CL / CD. Based on these results the best modifications for a single foil is to increase the length of 15% chord. As for the best modification of the group for the thickness is the thickness of 95% occurred at 9.9 seconds with a maximum torque Nm ² 1,72.10 and chord length for modification is the addition of 5% occurred in 4.3 seconds with a maximum torque of 1,84.10 Nm ²