DISTORTION OF GAS THRUST BEARING DUE TO VISCOUS SHEAR.

Abstract

Friction heat generated in the fluid film can distort the thrust surface and cause considerable reduction in load carrying capacity. In order to minimize the frictional power losses the bearing distortion must be minimized. The degree of distortion does not directly depend on the temperature level. The amount of distortion is enhanced by a large coefficient of thermal expansion and is reduced by a large coefficient of thermal conductivity. Large radius ratio bearings and/or high speed rotors are more sensitive to this type of thermal distortion. Analysis of a typical bearing design shows that the effects of thermal distortion can be significant for most structural materials. Materials for minimum thermal distortion are often not satisfactory with respect to structural considerations and from the standpoint of friction and wear. Application of surface coatings can alleviate the problem of friction and wear and permit the use of materials chosen for minimum thermal distortion. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1965
Accession Number
AD0629038

Entities

People

  • B. Sternlicht
  • C. H. T. Pan

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bearings
  • Coefficients
  • Distortion
  • Friction
  • Materials
  • Payload
  • Thermal Conductivity
  • Thermal Expansion
  • Thrust Bearings

Readers

  • Aerodynamics.
  • Thermal Physics or Thermal Science.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).