Eventos Anais de eventos
CONEM 2022
XI Congresso Nacional de Engenharia Mecânica - CONEM 2022
Design and simulation of a Francis hydraulic turbine runner according to Bovet's method
Submission Author:
Mateus Felipe Benicio Moraes , MA
Co-Authors:
Mateus Felipe Benicio Moraes, Dener Silva de Almeida
Presenter: Mateus Felipe Benicio Moraes
doi://10.26678/ABCM.CONEM2022.CON22-0382
Abstract
Hydraulic turbines, installed in hydroelectric plants, are used to harness and convert the hydraulic energy present in seas and rivers into mechanical energy that, in turn, can be used to generate electricity. In turbines, the component responsible for converting the energy is called the rotor. It consists of a set of blades with a special shape that uses the movement of water to acquire rotation. Such a device goes through a design process, in which the geometric characteristics and proportions are determined, but which does not provide a full understanding of the flow and properties such as velocity and pressure along the device. Thus, simulation has proven to be a very useful tool, because besides being a lower cost option, since laboratory tests can be disregarded, it is also more versatile and can be adapted to analyze the behavior of the rotor under different operating conditions. The following work aims at design and simulating the rotor of a Francis turbine. The design was performed using Bovet's method and the simulation process using ANSYS software. When the rotor is stationary, the pressure variation between the suction side and the pressure side of the blades presents unexpected behavior, where it is higher on the suction side than on the pressure side. The velocity gradually increases from the inlet to the outlet of the rotor. There is flow separation and vortex formation between the blades. With the rotor rotating, the fluid is observed to collide with the blades at the inlet edge, which caused the fluid currents to be projected in the direction of rotation. No flow separation was observed. Both velocity and pressure behave as expected, except in some particular situations. In general, the velocity gradually increases from the inlet to the outlet, while the pressure gradually decreases from the inlet to the outlet.
Keywords
Francis Turbine, Design, Simulation
