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research-article

THEORETICAL AND EXPERIMENTAL ANALYSES OF DIRECTLY LUBRICATED TILTING-PAD JOURNAL BEARINGS WITH LEADING EDGE GROOVE

[+] Author and Article Information
Thomas Hagemann

ASME Member, Institute of Tribology and Energy Conversion Machinery, Clausthal University of Technology, Leibnizstr. 32, 38678 Clausthal-Zellerfeld
hagemann@itr.tu-clausthal.de

Hubert Schwarze

ASME Member, Institute of Tribology and Energy Conversion Machinery, Clausthal University of Technology, Leibnizstr. 32, 38678 Clausthal-Zellerfeld
schwarze@itr.tu-clausthal.de

1Corresponding author.

ASME doi:10.1115/1.4041026 History: Received June 26, 2018; Revised July 11, 2018

Abstract

Flooded lubrication of tilting-pad journal bearings provides safe and robust operation for many applications due to a completely filled gap at the leading edge of each pad. While flooded conditions can be ensured by restrictive seals on the lateral bearing ends for any conventional bearing design, direct lubrication by leading edge grooves (LEG) placed on the pads represents an alternative to produce completely filled gaps at the entrance to the convergent lubricant film. Moreover, this design is flexible to apply different axial sealing baffles in order to influence the thermal equilibrium within the entire bearing. A theoretical model is presented that describes the specific influences of LEG design on the operating characteristics. First, in opposite to conventional tilting-pad journal bearing designs the LEG is a self-contained lube oil pocket which is generally connected to an outer annular oil supply channel. Consequently, each leading edge groove can feature a specific speed and load dependent effective pocket pressure and flow rate. As a consequence of this and the fact that the LEG is part of the pad, it directly influences its tilting angle. Secondly, the thermal inlet mixing model must consider the specific flow conditions depending on the main flow direction within the film as well as the one between outer annular channel and pocket. The novel LEG model is integrated into a comprehensive bearing code and validated with test data from high performance journal bearing test rig for a four tilting-pad bearing in load between pivot orientation.

Copyright (c) 2018 by ASME
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