Abstract
The draft tube is a component in the Kaplan turbine to create positive suction pressure using kinetic energy that is not used when leaving the turbine runner and increasing turbine power efficiency. This research aimed to find out the highest efficiency of variant geometries of a conical draft tube with spiral liner and without the spiral liner. The design geometry was processed using 2D software and 3D using Inventor and simulated in CFD software. The inlet water discharge was 0.1 m³s−1 with head 5 m and theoretical turbine power 4.9 kW. Based on the simulation results showed that the spiral liner draft tube variant was the best power and efficiency.
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