The effect of blade angle on two-stage water turbine against power and efficiency

Abstract

The Indonesian region has abundant alternative energy sources that can be used to meet electrical energy needs. One potential alternative energy source is water energy that can be converted into electrical energy with a water turbine. Water turbines are generally one stage, whereas water energy on the output side is still quite large. In this study, experiments were made using a two-stage micro water turbine model with blade angle variations on the second stage turbine. The type of turbine used in this study is a crossflow turbine with a vertical shaft. The results show that the 45o blade angle on the second stage turbine can increase the second stage turbine rotational speed, and also increase the power of second stage turbine. The total power of the turbine increases up to 29% compared to 15o blade angle. This indicates that the appropriate selection of the second stage turbine blade angle will significantly affect the total turbine power and its efficiency.