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Numerical modelling of hydrostatic lift pockets in hydrodynamicjournal bearings – Application to low speed working conditions of highly loaded tiltingpad journal bearings

Published online by Cambridge University Press:  06 November 2013

Xavier Raud ,
Michel Fillon  and
Mathieu Helene
Xavier Raud
Affiliation:
Département AMA/Groupe T63, 1 avenue du Général de Gaulle, Bureau IB010, 92141 Clamart Cedex, France
Michel Fillon
Affiliation:
Département Génie Mécanique et Systèmes Complexes, CNRS – Université de Poitiers – ENSMA, UPR 3346, SP2MI, Bd Marie et Pierre Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France
Mathieu Helene*
Affiliation:
Département AMA/Groupe T63, 1 avenue du Général de Gaulle, Bureau IB010, 92141 Clamart Cedex, France
*
a Corresponding author:mathieu.helene@edf.fr

Abstract

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Hydrodynamic journal bearings supporting high mass rotating machinery are subjected tolow rotational speeds during start-up or idling phases. These working conditions need ahydrostatic pressure contribution to ensure a correct load capacity when the hydrodynamicpressure is not established yet. This is possible by means of hydrostatic lift pockets.These pockets avoid mechanical damages via sufficient film thickness from start-up tohydrodynamic working conditions. In a first part, it is showed how an existing isothermal3D hydrodynamic numerical modelling of tilting pad bearing has been adapted to take intoaccount the lift pocket impact on static bearing performance. This approach is only validfor low rotational speeds, when inertia step pressure effects (rises or drops) at thefilm-pocket edge can be neglected compared to the total bearing pressure pattern. Then,numerical simulations have been performed, from 1 to 200 rpm with pockets and from 75 to200 rpm without pockets. The results have been compared and discussed in terms of pressurefields and bearing static performance such minimum film thickness, friction torque orrotor center position. Therefore, the interest of such lift pockets has been highlighted.Finally, calculations with and without pockets have been carried out in case of a strongbearing misalignment. As a result, the benefits of the lift pockets in this configurationare also significant in terms of static performance.

Keywords

Hydrostatic lift pocketshydrostatic lubricationhydrodynamic lubricationtilting pad journal bearingsPoches de soulèvement hydrostatiqueslubrification hydrostatiquelubrification hydrodynamiquepaliers à patins oscillants
Type
Research Article
Information
Mechanics & Industry , Volume 14 , Issue 5 , 2013 , pp. 327 - 334
Copyright
© AFM, EDP Sciences 2013

References

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