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Research Papers: Hydrodynamic Lubrication

A Study of Worn Hybrid Journal Bearing System With Different Recess Shapes Under Turbulent Regime

[+] Author and Article Information
E. Rajasekhar Nicodemus1

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, Indiarajasekhar_mvgr@yahoo.co.in

Satish C. Sharma

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, Uttarakhand 247667, Indiasshmefme@iitr.ernet.in

1

Corresponding author.

J. Tribol 132(4), 041704 (Oct 07, 2010) (12 pages) doi:10.1115/1.4002502 History: Received December 06, 2009; Revised August 27, 2010; Published October 07, 2010; Online October 07, 2010

The objective of the present paper is to study analytically the influence of wear on the performance of a capillary-compensated, four-pocket, hybrid journal bearing system operating in a turbulent regime by considering various geometric shapes of recess. The present study deals with bearings having four different geometric shapes of recess, i.e., square, circular, elliptical, and triangular recessed bearings. The wear on the bearing surface is modeled using Dufrane’s abrasive wear model. The Reynolds equation based on Constantinescu’s turbulent lubrication theory has been solved using finite element method along with a restrictor flow equation as a constraint together with appropriate boundary conditions. The numerically simulated results have been presented for a wide range of nondimensional external loads, wear depth parameters, and Reynolds numbers. The numerically simulated results suggest that the combined influence of wear, turbulence, and geometric shape of recess significantly affects the bearing performance. It has been observed that a triangular recessed bearing provides a greater value of minimum fluid film thickness when operating in a turbulent regime. It is also noticed that direct fluid film stiffness coefficients get reduced significantly when bearings operate in a turbulent regime compared with a laminar regime. Further, it is observed that from the viewpoint of fluid film stiffness, a square recessed bearing is found to be most suitable when operating in a turbulent regime.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

The capillary-compensated four-pocket hydrostatic journal bearing system and coordinate system

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Figure 2

Bearing configurations

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Figure 3

Worn journal bearing geometry

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Figure 4

Overall solution scheme

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Figure 5

Variation of ε with So

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Figure 6

Percentage change in performance characteristics of hybrid journal bearing as compared with base bearing at Ω=1.0

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Figure 7

Variation of h¯min with W¯o

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Figure 8

Variation of h¯min with δ¯w

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Figure 9

Variation of Q¯ with δ¯w

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Figure 10

Variation of T¯fric with δ¯w

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Figure 11

Variation of S¯11 with W¯o

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Figure 12

Variation of S¯11 with δ¯w

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Figure 13

Variation of S¯22 with W¯o

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Figure 14

Variation of S¯22 with δ¯w

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Figure 15

Variation of C¯11 with δ¯w

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Figure 16

Variation of C¯22 with δ¯w

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Figure 17

Variation of ω¯th with δ¯w

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