EFFECT OF CENTRIFUGAL FORCE ON THE LOAD CAPACITY OF THRUST GAS BEARING
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Date
2022-12-12Author
Haidar, Rakan Mohammed
0000-0002-2589-0711
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It has been known for many decades that both rigid and foil thrust bearings are two
options in the market for high-speed turbomachinery systems. Their advantages encompass the
lower manufacturing cost, the lighter weight, and the flexibility in allowing “component
misalignment and runout.” When the operating fluid is air, the classical lubrication theory works
perfectly. Any additional terms of the inertia effect might be somehow less significant and
sometimes negligible since the viscous forces will be dominant, but this may not be the case if the
bearing operates in a harsh environment, such as a high-pressure environment. Nonetheless, this
is a different scenario when dealing with water or denser gases lubricated bearings since the inertia
forces have significance and effects as same as the viscous forces. Therefore, the classical
lubrication theory, where the inertia forces are very small – Modified Reynolds number (Re) << 1
– should be rederived and modified to include those additional terms. As they play a major role in
affecting the bearing performance by reducing its load capacity, they should be considered. This
thesis shows the comparison of both solutions when inertial terms are considered and when they
are not through the comparison of the local Reynold number, pressure, streamlines, deflections,
and load capacity.
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