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Numerical analysis of fluid seals applied to rotating machinery

Grant number: 11/09750-7
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2011
Effective date (End): November 30, 2012
Field of knowledge:Engineering - Mechanical Engineering - Mechanics of Solids
Principal researcher:Katia Lucchesi Cavalca Dedini
Grantee:Larissa Galera
Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The study of rotordynamics machinery is very important in the context of solids mechanics, because the subject has a prominent position on the study and applications of machines and structures. The presence of a rotating component transmitting power can lead to a series of problems, therefore, it is very important a mathematical development that allows the simulation of the operational characteristics of those machines and to understand the phenomena related to their dynamics. The rotordynamics analysis intends to predict the behavior and to identify deviations thought the dynamics responses of the set, providing traces of malfunction or failure diagnosis, minimizing the risks of subtle halts of the system. The dynamic study of rotating machines must be done considering the interaction between the components involved in their construction, for example bearing, fluid seals, rotors, shafts and supporting structures. In this context, this project has as purpose the determination of plain seals' physics parameters, which must be added to the global model of rotating systems. The difference between the pressure on the inlet and the outlet of mechanical seals will be obtained thought the governmental equations for liquids flowing in annular seals, and by the Bernoulli equation, utilizing the finite volume method. The equivalent stiffness and damping coefficients will be estimated by the least squares method. The Moody and Blasius friction factors will be compared and the results obtained will be validated though direct comparison with the values presented on the literature. The results of this project will be applied on the global modeling of a rotating machine, in order to make the analysis of the rotating set more complete.