Rudy Soenoko, Purnami, Fransisca Gayuh Utami Dewi
Indonesia has the potential energy of water around 75000-76000 MW. But the utilization is still about 3,783 MW for large-scale and 220 MW for small scale power generation. There are still many people living in rural areas where electricity supply is very low. To answer the social problems in rural areas, it is clearly that looking for alternative energy sources is important to increase people revenue. To solve these problems the exact answer is developing an alternative energy, namely micro hydro. Many theories and research on cross flow has been done up to now aims to enhance the turbine performance by concentrating on the turbine internal flow behavior and preventing the water flow chaotic. Previous research suggests that by putting several guides on the turbine nozzle could increase the water pressure entering the turbine blade. The following study will elaborate on the effect of nozzle angle attack and the water flow rate on the turbine second level toward the turbine performance. By positioning the nozzle direct to the turbine second level it is expected a maximum cross flow turbine second level performance. This study uses a true experimental research. In this case the experimental device is made under a laboratory scale. For this study, the independent variable is the water flow rate and the dependent variable is the turbine efficiency. The turbine rotation angle variation was observed under a nozzle angle attack of 30°, 45°, 60° and 70°. highest turbine performance was found on a 30 nozzle angle attack, under a 20 Newton loading and on a maximum valve opening. Through this laboratory testing it could be concluded that the nozzle angle attack would greatly affect the cross flow turbine performance. © 2006-2017 Asian Research Publishing Network (ARPN). All rights reserved.
Mechanical Engineering Department, Engineering Faculty, Brawijaya University, Malang, Indonesia
