Kajian Ekperimen Pengaruh Pemasangan Silinder Sirkular Bervariasi Diameter dengan Posisi X/D = 0.5 dan Y/D = 0.7 pada Sisi Advancing Blade Terhadap Performa Turbin Air Savonius

Abstract

Savonius water turbine has the opportunity to be developed. An innovation is needed to
improve the performance of savonius water turbines. An experimental study on the effect of installing a
circular cylinder with varying diameters on the advancing blade side of the savonius water turbine
performance needs to be carried out. The experiment used savonius water turbine myring n = 1 and
myring n = 2 with a diameter and rotor height of 40 cm each. Circular cylinder diameter variations used
are ds/D=0.2, ds/D=0.3, and ds/D=0.4. Circular cylinder is positioned at a distance of X/D=0.5 and
Y/D=0.7. The result is the coefficient of torque (Ct) and the coefficient of power (Cp). In addition, the
diameter of the circular cylinder that is capable of producing the best performance of Savonius water
turbines will be obtained. The results of the experiment indicate that the installation of a circular cylinder
on the advancing blade can improve the performance of savonius water turbines. Variation in circular
cylinder diameter ds/D=0.4 results the highest Ct and Cp values in the savonius water turbine myring
n=1 and myring n=2. Myring n=1 turbine experiment shows the value of Ct obtained is 0.34 at the tip
speed ratio (TSR) of 0.73, while in myring n=2 turbine, the value of Ct obtained is 0.34 at TSR 0.49.
Myring n=1 turbine experiment shows a Cp value of 0.25 at TSR 0.73 (showing an increase of 66.67%),
whereas in myring n=2 turbine, the Cp value obtained is 0.16 at TSR 0.49 (showing an increase of
21.43%).