This is Part II of a two-part series of papers describing the effects of high-pressure injection pockets on the operating conditions of tilting-pad thrust bearings. The paper has two main objectives. One is an experimental investigation of the influence of an oil injection pocket on the pressure distribution and oil film thickness. Two situations are analyzed: (i) when the high-pressure oil injection is turned off and (ii) when the high-pressure injection is turned on. The other objective is to validate a numerical model with respect to its ability to predict the influence of such a pocket (with and without oil injection) on the pressure distribution and oil film thickness. Measurements of the distribution of pressure and oil film thickness are presented for tilting-pad thrust bearing pads of 100cm2 surface area. Two pads are measured in a laboratory test rig at loads of 1.5MPa and 4.0MPa and velocities of up to 33ms. One pad has a plain surface. The other pad has a conical injection pocket at the pivot point and a leading-edge taper. The measurements are compared to theoretical values obtained using a three-dimensional thermoelastohydrodynamic (TEHD) numerical model. At the low load, the theoretical pressure distribution corresponds well with the measured values for both pads, although the influence of the pocket is slightly underestimated. At the high load, large discrepancies exist for the pad with an injection pocket. It is argued that the discrepancies are due mainly to geometric inaccuracies of the collar surface, although they may to some extent be due to the simplifications employed in a Reynolds equation description of the pocket flow. The measured and theoretical values of oil film thickness compare well at low loads and velocities. At high loads and velocities, discrepancies grow to up to 25%. This is due to the accuracy of the measurements. When using hydrostatic jacking the model predicts the start-up behavior well.

1.
Hemmi
,
M.
, and
Inoue
,
T.
, 1999, “
The Behavior of the Centrally Pivoted Thrust Bearing Pad With Hydrostatic Recesses Pressurized by a Constant-Rate Flow
,”
Tribol. Trans.
1040-2004,
42
(
4
), pp.
907
911
.
2.
Yuan
,
J. H.
,
Medley
,
J. B.
, and
Ferguson
,
J. H.
, 2001, “
Spring-Supported Thrust Bearings Used in Hydroelectric Generators: Comparison of Experimental Data With Numerical Predictions
,”
Tribol. Trans.
1040-2004,
44
(
1
), pp.
27
34
.
3.
Ettles
,
C. M.
, 1991, “
Some Factors Affecting the Design of Spring Supported Thrust Bearings in Hydroelectric Generators
,”
ASME J. Tribol.
0742-4787,
113
(
3
), pp.
626
632
.
4.
Glavatskikh
,
S. B.
,
Fillon
,
M.
, and
Larsson
,
R.
, 2002, “
The Significance of Oil Thermal Properties on the Performance of Tilting-Pad Thrust Bearings
,”
ASME J. Tribol.
0742-4787,
124
(
2
), pp.
377
385
.
5.
Mahieux
,
C. A.
, 2005, “
Experimental Characterization of the Influence of Coating Materials on the Hydrodynamic Behavior of Thrust Bearings: A Comparison of Babbitt, PTFE, and PFA
,”
ASME J. Tribol.
0742-4787,
127
(
3
), pp.
568
574
.
6.
Heinrichson
,
N.
,
Santos
,
I. F.
, and
Fuerst
,
A.
, 2007, “
The Influence of Injection Pockets on the Performance of Tilting-Pad Thrust Bearings—Part I: Theory
,”
ASME J. Tribol.
0742-4787,
129
(
4
), pp.
895
903
.
7.
Heinrichson
,
N.
, and
Santos
,
I. F.
, 2005, “
Comparison of Models for the Steady-State Analysis of Tilting-Pad Thrust Bearings
,”
Proc. of 18th Int. Congr. Mech. Engin. (COBEM 2005)
,
Brazilian Society of Mechanical Sciences and Engineering
,
Ouro Preto, Brazil
, Nov. 6–11, pp.
1
8
.
8.
Glavatskikh
,
S. B.
, 2001, “
Steady State Performance Characteristics of a Tilting Pad Thrust Bearing
,”
ASME J. Tribol.
0742-4787,
123
(
3
), pp.
608
615
.
9.
Ettles
,
C. M.
, and
Donoghue
,
J. P.
, 1971, “
Laminar Recess Flow in Liquid Hydrostatic Bearings
,”
Proc. Inst. Mech. Eng.
0020-3483,
C27/71
, pp.
215
227
.
You do not currently have access to this content.