Title page for ETD etd-11212012-040039
|Type of Document
||Analysis of tilting-pad oil seals for high pressure centrifugal compressors
||Master of Science
|Kirk, R. Gordon
|Mitchiner, Reginald G.
|Date of Defense
Oil ring seals are one major source of instability in high pressure centrifugal compressors. This
thesis presents a method for analysis of an improved seal concept that has been used in very high
pressure designs (900 PSI). The improved design uses a combination of ring seals and tilting pad
bearing elements. The stable tilting pad is used to center the heavily grooved seal element. The
eight stiffness and damping coeflicients which represent the hydrodynamic forces between the
journal and the seal assembly are computed by an automated computer code for evaluation of both
the standard ring seal and the tilting pad elements. Both synchronous and nonsynchronous steady
state characteristics have been included in the analysis. The nonsynchronous whirl of the rotor
and its effects on the stiffness and damping coefiicients of a 5 tilting pad seal have been given in the
form of design curves. The effect of pad inertia which has been neglected in many bearing analysis
codes has been incorporated in this seal analysis, and allowed the determination of the exact cross
coupling stiffness and damping coefficients.
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