DESIGN AND ANALYSIS VORTEX MICROHYDRO TURBINE

• Main Author: Nauval Hamzah, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/48223
• Institution: Institut Teknologi Bandung

Vortex turbine is a type of micro-hydro turbine, which is a water turbine with a power of 5-100 kW. Vortex turbines are operated by using the flow that enters the circulation tank by tangency to form a vortex, which then moves the blade in the middle of the circulation tank. The shape and characteristics of vortex are determined by the geometry of basin. Geometry parameters that contribute to vortex characteristics include planform circulation tank, planform radius circulation tank, taper diameter, outlet diameter, and taper angle. Vortex flow has three speed components, namely axial, tangential, and radial velocity. The distribution of flow velocity components at certain positions in the circulation tank can be a reference in designing blade geometry and placing the blade so that it can convert maximum fluid energy. The influence of the presence of the blade on the flow of vortex in the circulation tank is also a factor that need attention. The study was conducted by analyzing the Computational Fluid Dynamic (CFD) Simulation using ANSYS CFX software. The case is refuted with a free surface multiphase model because the flow includes open channel flow involving two types of fluids namely water and air. Simulations are carried out with two different condition, the simulation of flow on a basin without a blade and the simulation of flow on a basin with a blade. In basin simulations, variations in the basin geometry are made and the influence of the geometry parameters for the vortex flow are sought. In each geometry variation, water volume fraction that fill the basin area is comparison factor to see the quality of the vortex formed. Changes in outlet diameter contribute significantly to vortex formation compared to other geometry parameters. Then the flow in the basin with the blade is simulated to get power and efficiency from the turbine system.