# Analisa Pengaruh Sudut Stagger Di Depan Advancing Blade Terhadap Performa Turbin Air Savonius Myring Blade n=1 & n=2

### Abstract

Savonius water turbines can work at low fluid flow rates and have high torque, but have disadvantages which is the lowest Cp value compared to other turbine types. Efficiency can be improved by changing the shape of the Savonius Turbine blade using the myring equation and adding an obstacle. The experimental method in this study combines two blades resulting from variations of the value (n) in the myring equation n = 1 and n = 2, with myring n = 1 placed on the concave side and n = 2 on the convex side. To improve performance, a 12 cm diameter circular cylinder is placed in front of the advancing blade with varying stagger angles. The test model has a height of 0.40 m and a diameter of 0.40 m which will be tested in a flowing tank with a width of 1 m and height of 1 m. Experiments were carried out at a current speed of 0.2 m / s by measuring the turbine rotation and load to produce a torque coefficient and a power coefficient. The experimental results show that the placement of the circular cylinder with ds / D = 0.3, S / D = 0.75, and γ = 60º obtained the highest performance with an angular velocity of 0.5160 rad / s, Coefficient of torque (Ct) of 0.2936 and Coefficient of power (Cp) of 0.1515. With a percentage increase compared to myring n = 1 and n = 2 without an obstacle of 10.27%, this proves that the addition of a circular cylinder can improve the performance of Savonius water turbines.