KAJIAN EKSPERIMEN KINERJA TURBIN ANGIN SAVONIUS SUDU OVERLAP BERPROFIL MYRING n=1 DENGAN VARIASI SUDUT STAGGER SILINDER DI DEPAN SUDU RETURNING

Abstract

The previous Savonius wind turbine studies have proved that overlap
modifications to conventional blades can improve turbine performance. With these
conventional blades, the performance is less optimum because the drag force generated by
turbine's rotation is still high. Based on this condition, this experiment is conducted by
modifying Savonius wind turbine with overlap blades using Myring equation n = 1. Its
blade profile is made half-elliptical to reduce drag force. Diameter and height of the
turbine are 400 mm with 0.3 overlap ratio. The ratio of cylinder diameter (ds/D) is 0.4, and
the ratio of cylinder center distance (S/d) is 1.7. Experiments are conducted by varying
stagger angles of circular cylinder in front of returning blade i.e 45°, 50°, 55°, and 60°. Its
wind speed variations are 5 m/s, 6 m/s, and 7 m/s. The final results show that the best
performance improvement of the turbine occurs at 60° stagger angle and 6 m/s wind speed.
The increase in torque coefficient is 4.95% and power coefficient is 20.16% to overlap
Savonius wind turbine with myring n = 1 with no circular cylinder