Rotordynamic Effects Driven by Fluid Forces from a Geometrically Imperfect Labyrinth

Abstract

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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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1993
Accession Number
ADA276424

Entities

People

  • William C. Williston Jr.

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Blade Tips
  • Computational Fluid Dynamics
  • Engineering
  • Equations
  • Fluid Dynamics
  • Frequency
  • Gas Turbines
  • Geometry
  • Mass Flow
  • Mechanical Engineering
  • Pressure Distribution
  • Propulsion Systems
  • Reynolds Number
  • Three Dimensional
  • Turbines
  • Two Dimensional
  • United States

Readers

  • Combustion and Flow Dynamics.
  • Control Systems Engineering.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).