High-speed foil bearings are currently used in increasingly demanding, high performance applications. The application under consideration is a 120 krpm natural gas turboexpander-compressor, which requires 38 mm (1.5 in.) foil journal bearings with high stiffness and load capacity to help enhance rotordynamic stability. This paper describes the development of the foil bearing for this application and includes measured stiffness and damping coefficients recorded on a high-speed dynamic bearing test rig. The dynamic test data were taken for several different foil bearing configurations with varying spring-element foil thicknesses, number of spring-element foils, and bearing shim thickness. All three parameters have a direct impact on bearing clearance. The influence of these different parameters on measured stiffness and damping coefficients and thermal performance of the bearings are presented and discussed.

References

References
1.
Lubell
,
D.
,
DellaCorte
,
C.
, and
Stanford
,
M.
,
2006
, “Test Evolution and Oil-Free Engine Experience of a High Temperature Foil Air Bearing Coating,”
ASME
Paper No. GT2006-90572.
2.
Barnett
,
M. A.
, and
Silver
,
A.
,
1970
, “Application of Air Bearings to High-Speed Turbomachinery,”
SAE
Paper No. 700720.
3.
DellaCorte
,
C.
,
2008
, “Technical Development Path for Foil Gas Bearings,”
ASME
Paper No. IJTC2008-71024.
4.
Alford
,
J. S.
,
1965
, “
Protecting Turbomachinery From Self-Excited Rotor Whirl
,”
ASME J. Eng. Power
,
87
(
4
), pp.
333
334
.
5.
Vance
,
J. M.
, and
Laudadio
,
F. J.
,
1982
, “
Experiment Measurement of Alford's Force in Axial-Flow Turbomachinery
,”
Rotordynamic Instability Problems in High-Performance Turbomachinery
, College Station, TX, May 10–12, pp.
260
273
.https://ntrs.nasa.gov/search.jsp?R=19830007375
6.
Rimpel
,
A.
,
Moore
,
J.
,
Grieco
,
J.
,
Shy
,
P.
,
Klein
,
J.
, and
Brady
,
J.
,
2012
, “Rotordynamics of a 105,000 RPM Oil-Free Compressor-Expander for Subsurface Natural Gas Compression and Reinjection,”
ASME
Paper No. GT2012-69119.
7.
Rimpel
,
A.
,
Allison
,
T.
,
Moore
,
J.
,
Grieco
,
J.
,
Shy
,
P.
,
Klein
,
J.
, and
Brady
,
J.
,
2012
, “Open-Loop Aerodynamic Performance Testing of a 105,000 RPM Oil-Free Compressor-Expander for Subsurface Natural Gas Compression and Reinjection,”
ASME
Paper No. GT2012-69017.
8.
Moore
,
J.
,
Lerche
,
A.
,
Allison
,
T.
,
Ransom
,
D.
, and
Lubell
,
D.
,
2011
, “
Development of a High Speed Gas Bearing Test Rig to Measure Rotordynamic Force Coefficients
,”
ASME J. Eng. Gas Turbines Power
,
133
(
10
), p.
102504
.
9.
Swanson
,
E. E.
, and
O'Meara
,
P. S.
,
2015
, “Wing Foil Bearings and Methods of Manufacturing Same,” Xdot Engineering And Analysis Pllc, Charlottesville, VA, U.S. Patent No.
9,222,509
.http://www.google.ch/patents/US9222509
10.
Dellacorte
,
C.
,
2011
, “
Stiffness and Damping Coefficient Estimation of Compliant Surface Gas Bearings for Oil-Free Turbomachinery
,”
Tribol. Trans.
,
54
(
4
), pp.
674
684
.
11.
Kim
,
T. H.
, and
Andres
,
L. S.
,
2009
, “
Effects of a Mechanical Preload on the Dynamic Force Response of Gas Foil Bearings: Measurements and Model Predictions
,”
Tribol. Trans.
,
52
(
4
), pp.
569
580
.
12.
Iordanoff
,
I.
,
1998
, “
Maximum Load Capacity Profiles for Gas Thrust Bearings Working Under High Compressibility Number Conditions
,”
ASME J. Tribol.
,
120
(
3
), pp.
571
576
.
13.
Swanson
,
E. E.
,
2006
, “
Bump Foil Damping Using a Simplified Model
,”
ASME J. Tribol.
,
128
(
3
), pp.
542
550
.
You do not currently have access to this content.