THE DESIGN OF 500 KW FRANCIS TURBINE AT 30 M HEAD AND 500 RPM OF ROTATIONAL SPEED

• Main Author: Febrianto, Stevanus
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/47394
• Institution: Institut Teknologi Bandung

Indonesia’s population is projected to reach 300 million by 2035. This incremental will be proportional to the increase of energy consumptions. 65% of Indonesia’s electricity manufacturing still uses coal as its raw material. This shows that Indonesia is still very dependent on non-renewable energy. As the largest archipelagic country, Indonesia has massive hydropower potential. From the total potential of around 75000 MW, Indonesia has just managed to utilize only less than 8% or around 6000 MW. Therefore, further study must be made in order for Indonesia to be able to utilize all the resources available to its maximum potential. In this study, a Francis turbine system was designed and tested numerically with Computational Fluid Dynamics. The known parameters of the design are 30 m of head, 500 kW of power generated with a rotational speed of 500 rpm. The meridional geometry of the blade will be designed using Nechleba method. Other main components such as runner, guide vane, stay vane, spiral casing and draft tube are designed and modelled with ANSYS BladeGen and Solidworks 2014. The objective of numerical simulation is to achieve the optimum performance of the Francis turbine system by varying the guide vane angle and operating rotational speed using ANSYS Fluent with realizable k-epsilon turbulence model on a steady state condition. Based on the simulation result, Francis turbine system will reach its highest efficiency point at 83,42% with flow rate of 1,889 m3/s at guide vane angle of 15o. While this Francis turbine system will be able to generate 500 kW of power at guide vane angle of 19 to 20o, with an efficiency of around 82 to 83%. Efficiency of Francis turbine will be at its highest when it is operated on the designed rotational speed.