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Thermohydrodynamic analysis of a textured sector-pad thrustbearing: 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 andmechanical deformations of a fixed-geometry thrust bearing with artificial surfacetexturing is presented. A parallel eight-pad bearing is considered; the surface of eachpad is partially textured with square dimples. Here, a CFD-based thermohydrodynamicmodeling approach, recently introduced by the authors, is used to calculate theperformance of the bearing; the THD results are then used to quantify the deformations ofthe bearing mechanical parts. The bearing is modelled as a sector-shaped channel,consisting of a smooth rotating wall (thrust collar) and a partially textured stationarywall (bearing pad). The bearing performance characteristics are computed by means ofnumerical simulations, based on the numerical solution of the Navier-Stokes and energyequations for incompressible flow, as well as on the solution of the elasticity equationsfor the bearing solid parts. Here, a reference texture geometry is considered, whileproper thermal and structural boundary conditions are implemented. For representative filmthickness values, the effect of rotational speed and collar thickness on bearingperformance is quantified, and the resulting pad and rotor deformation fields arecomputed. It is found that, due to oil heating, the load carrying capacity decreases withrotational speed for values higher that approximately 2000 rpm. The computed rotordeformation field is representative of a fixed support beam, characterized bysubstantially higher levels than those of the bearing pad. Rotor deformations increasesubstantially 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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