Rotordynamic effects driven by fluid forces from a geometrically imperfect labyrinth seal
Williston, William C.
Millsaps, Knox T.
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The forces on a rotor due to asymmetric pressure distributions resulting from a single gland non-circular labyrinth seal in a circular outer casing are analyzed for the purpose of understanding the possible causes of synchronous vibration due to seal intolerance. A lumped parameter model is developed for flow in the azimuthal direction inside the seal gland. The sealing knife imperfections causing the non-circularity may be due to manufacturing defects or in service ware. The resulting continuity and momentum equations are solved using a regular linear perturbation technique. Results from this model indicate under what conditions seal imperfections can generate forces of the same order of magnitude as rotor mass unbalance
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