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Improvement of the thrust bearing calculation considering the convectional heating within the space between the pads

Abstrakt

A modern thrust bearing calculation tool should consider not only the oil film between pad and rotating collar but also the space between the pads. The oil flow in the space has a significant influence on the oil film inlet temperature, the convectional cooling of pad and collar and should be included in the bearing calculation methods. The authors use a tool developed at Clausthal University of Technology in cooperation with the research association for combustion engines (FVV) eV in Germany. The solutions of the Reynolds equation, the energy equation and the heat transfer equation are done iteratively using the Finite Volume Method by considering constant flow rate. Between many features of the tool one can mention for the oil film: JFO cavitation model, laminar/turbulent flow and centrifugal force. This paper shows investigations done for tilting pad thrust bearings that are used in hydro-generating machines. The calculation results are compared with measurements done on a thrust bearing test rig at Gdansk University of Technology. The pad number of the original test rig (8) with an outer diameter of 180 mm was changed to 4, 6 and 9 of the same size. The influence of the distance between the pads is studied for loads up to 3 MPa, speeds up to 4000 rpm and different oil flows. Central and offset pad supports are tested. The calculated pad temperature field is adjusted to the measured values using different heat convection coefficients. After validation of the calculation tool the results of other conditions like high transient load are shown.

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Kategoria:
Aktywność konferencyjna
Typ:
publikacja w wydawnictwie zbiorowym recenzowanym (także w materiałach konferencyjnych)
Tytuł wydania:
16th EDF/Pprime Workshop: Behaviour of journal and thrust bearings under transient and mixed lubrication regime strony 1 - 12
Język:
angielski
Rok wydania:
2017
Opis bibliograficzny:
Chmielowiec-Jabłczyk M., Schubert A., Kraft C., Schwarze H., Wodtke M., Wasilczuk M.: Improvement of the thrust bearing calculation considering the convectional heating within the space between the pads// 16th EDF/Pprime Workshop: Behaviour of journal and thrust bearings under transient and mixed lubrication regime/ : , 2017, s.1-12
Weryfikacja:
Politechnika Gdańska

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