Performa Turbin Spinning Top Darrieus Terhadap Saluran Berbelok

Abstract

The Spinning Top Darrieus hydrokinetic turbine has curved blades that cause its initial rotation to be weak due to the effect of lift, especially when the turbine starts to rotate. This experimental study aims to improve turbine performance by varying the flow position. The tests were conducted at four flow positions, namely one in a straight channel and three in channels with angles of 0°, 90°, and 180°. The experiments were conducted in an open channel (flume) measuring 100 cm wide, 600 cm long, 80 cm high, with a water depth of 60 cm. The tests were conducted at four variations of average flow velocity, namely V1 = 0.228 m/s, V2 = 0.276 m/s, V3 = 0.368 m/s, and V4 = 0.361 m/s. The turbine used a NACA0018 blade profile. The results showed that the turbine in the straight channel had the best performance compared to the curved channel. In the straight channel, the power generated ranged from 0.333 to 1.521 J/s with an efficiency of 46.274% to 58.232% and a Coefficient of Power of 0.373 to 0.429. Meanwhile, the lowest performance occurred in the 180° angled channel with power ranging from 0.101 to 0.630 J/s and a Coefficient of Power of 0.102 to 0.134.