Rotordynamic Effects Driven by Fluid Forces from a Geometrically Imperfect Labyrinth
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Pagination or Media Count:
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.
- Adhesives, Seals and Binders
- Fluid Mechanics