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Thermohydrodynamic analysis of a textured sector-pad thrust bearing: effects on mechanical deformations

Published online by Cambridge University Press:  08 August 2014

A. Charitopoulos ,
D. Fouflias ,
C.I. Papadopoulos ,
L. Kaiktsis  and
M. Fillon
A. Charitopoulos*
Affiliation:
School of Naval Architecture and Marine Engineering, National Technical University of Athens, Zografos, Greece
D. Fouflias
Affiliation:
School of Naval Architecture and Marine Engineering, National Technical University of Athens, Zografos, Greece
C.I. Papadopoulos
Affiliation:
School of Naval Architecture and Marine Engineering, National Technical University of Athens, Zografos, Greece
L. Kaiktsis
Affiliation:
School of Naval Architecture and Marine Engineering, National Technical University of Athens, Zografos, Greece
M. Fillon
Affiliation:
Institut Pprime, CNRS – University of Poitiers – ENSMA, Dpt GMSC, Futuroscope Chasseneuil, France
*
a Corresponding author: chpap@central.ntua.gr
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Abstract

In this paper, a computational investigation of thermohydrodynamic performance and mechanical deformations of a fixed-geometry thrust bearing with artificial surface texturing is presented. A parallel eight-pad bearing is considered; the surface of each pad is partially textured with square dimples. Here, a CFD-based thermohydrodynamic modeling approach, recently introduced by the authors, is used to calculate the performance of the bearing; the THD results are then used to quantify the deformations of the bearing mechanical parts. The bearing is modelled as a sector-shaped channel, consisting of a smooth rotating wall (thrust collar) and a partially textured stationary wall (bearing pad). The bearing performance characteristics are computed by means of numerical simulations, based on the numerical solution of the Navier-Stokes and energy equations for incompressible flow, as well as on the solution of the elasticity equations for the bearing solid parts. Here, a reference texture geometry is considered, while proper thermal and structural boundary conditions are implemented. For representative film thickness values, the effect of rotational speed and collar thickness on bearing performance is quantified, and the resulting pad and rotor deformation fields are computed. It is found that, due to oil heating, the load carrying capacity decreases with rotational speed for values higher that approximately 2000 rpm. The computed rotor deformation field is representative of a fixed support beam, characterized by substantially higher levels than those of the bearing pad. Rotor deformations increase substantially at low values of collar thickness.

Keywords

Thrust bearingsthermohydrodynamic lubricationmechanical deformationsartificial surface texturing
Type
Research Article
Information
Mechanics & Industry , Volume 15 , Issue 5 , 2014 , pp. 403 - 411
Copyright
© AFM, EDP Sciences 2014

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