Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ANALYSIS OF THERMOHYDRODYNAMIC MODELS FOR THE BEARINGS OF A FRANCIS HYDROPOWER UNIT
Submission Author:
Jefferson Barbosa , SP
Co-Authors:
Jefferson Barbosa, Leonardo Sicchieri, Aldemir Ap Cavalini Jr, Valder Steffen Jr
Presenter: Jefferson Barbosa
doi://10.26678/ABCM.COBEM2019.COB2019-0678
Abstract
This work is dedicated to the computational modeling of the hydrodynamic bearings present in a Francis hydropower unit. In order to represent the dynamic behavior of these bearings, a thermohydrodynamic approach is used, in which the thermal effects due to the viscous friction of the oil film are computed through the simultaneous solution of the Reynolds and energy equations. Using simplifying hypotheses, three hydrodynamic bearings of the hydropower unit are analyzed, namely tilting-pad thrust bearing, tilting-pad journal bearing, and cylindrical journal bearing. In order to verify the consistency of the numerical results obtained in the present work, the results provided by the manufacturer were used. The obtained results demonstrated to be promising since they have a good correlation with the information extracted from the manufacturer. It is worth mentioning that the present work was developed under the R&D project Robust Modeling for the Diagnosis of Defects in Generating Units (02476-3108/2016) conducted by ANEEL (Brazilian Electric Energy Agency). This project is carried out at the Federal University of Uberlândia, Brazil, with the financial support of the companies CERAN, BAESA, ENERCAN, and Foz do Chapecó.
Keywords
Hydrodynamic bearings, thermohydrodynamic model, Francis hydropower units
