Elasticity Effects on Cavitation in a Squeeze Film Damper Undergoing Noncentered Circular Whirl

Abstract

Elasticity of the linear and its effects on cavitation were numerically determined for a squeeze film damper subjected to dynamic loading. The loading was manifested as a prescribed motion of the rotor undergoing noncentered circular whirl. The boundary conditions were implemented using Elrod's algorithm which conserves lineal mass flux through the moving cavitation bubble as well as the oil film region of the damper. Computational movies were used to analyze the rapidly changing pressures and vapor bubble dynamics throughout the dynamic cycle for various flexibilities in the damper liner. The effects of liner elasticity on cavitation were only noticeable for the intermediate and high values of viscosity used in this study. Keywords: Cavitation; Squeeze film damper; Damping; Whirl; Noncentered whirl; Dynamic loads; Fluid film; Bearings; Dampers; Elasticity.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1989
Accession Number
ADA217846

Entities

People

  • David E. Brewe

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Algorithms
  • Army Aviation
  • Bearings
  • Boundaries
  • Bubbles
  • Cavitation
  • Collapse
  • Computer Programs
  • Deflection
  • Eccentricity
  • Elastic Properties
  • Equations
  • High Speed Photography
  • Journal Bearings
  • Materials
  • Pressure Distribution
  • Thickness

Fields of Study

  • Engineering

Readers

  • Computational Fluid Dynamics (CFD)
  • Materials Science and Engineering.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).