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A THERMOELASTOHYDRODYNAMIC ANALYSIS FOR THE STATIC PERFORMANCE OF HIGH SPEED - HEAVY LOAD TILTING-PAD JOURNAL BEARING OPERATING IN THE TURBULENT FLOW REGIME AND COMPARISONS TO TEST DATA

[+] Author and Article Information
Hirotoshi Arihara

Research Engineer, Kobe Steel LTD., Kobe-city, Hyogo 651-2271, Japan
arihara.hirotoshi@kobelco.com

Yuki Kameyama

R&D Engineer, Kobe Steel LTD., Takasago-city, Hyogo 676-8670, Japan
kameyama.yuki@kobelco.com

Yoshitaka Baba

Deputy General Manager, Kobe Steel LTD., Takasago-city, Hyogo 676-8670, Japan
baba.yoshitaka@kobelco.com

Luis San Andres

Mast-Childs Chair Professor, ASME Fellow, Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843, USA
lsanandres@tamu.edu

1Corresponding author.

ASME doi:10.1115/1.4041130 History: Received July 05, 2018; Revised July 17, 2018

Abstract

This paper details a thermoelastohydrodynamic (TEHD) analysis model applied to Tilting-pad journal bearings (TPJBs), presents predictions for their steady-load performance, and discusses comparisons with experimental results to validate the model. The test bearing has four pads with a load between pads configuration; its length L=76.2 mm and shaft diameter D=101.6 mm (L/D=0.75). The rotor top speed is 22.6 krpm, i.e. 120 m/s surface speed, and the maximum specific load is 2.94 MPa for an applied load of 23 kN. The test procedure records shaft speed and applied load, also measures the pads' temperature and shaft temperature. The TEHD model couples a generalized Reynolds equation for the hydrodynamic pressure generation with a three-dimensional energy transport equation for the film temperature. The pad mechanical deformation due to pressure utilizes the finite elemental method, whereas an analytical model estimates thermally induced pad crowning deformations. For operation beyond the laminar flow regime, the analysis incorporates the eddy viscosity concept for fully developed turbulent flow operation. Current predictions show static performance characteristics such as bearing power loss, flow rate, and pad temperatures. The comparisons of test results and analysis results reveal that turbulent flow effects significantly reduce the pads' maximum temperature while increasing the bearing power loss. Turbulent flow mixing increases the diffusion of thermal energy and makes more uniform the temperature profile across the film.

Copyright (c) 2018 by ASME
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