Rub Tolerant Materials Development. Nickel-Chromium-Aluminum for Use as a Transpiration-Cooled High Pressure Turbine Abradable Seal.

Abstract

A transpiration-cooled, high pressure gas turbine shroud was designed, built, and rig tested. The shroud consisted of a porous rub tolerant material, nickel-chromium-aluminum (NiCrAl) which was brazed to a flow control/cooling gas distribution chamber. The NiCrAl layer was optimized for abradability and thermal stability. A flow control chamber was designed which controlled the amount and distribution of the cooling gas flow to the rub tolerant layer. The shroud was tested for cyclic oxidation resistance and high velocity, hot gas erosion stability. Optimization of the system for maintaining a 1900 F (1040 C) surface temperature in a high velocity, 2600 F (1427 C) gas stream was achieved by using a combination of thermal conduction and transpiration cooling mechanisms. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1977
Accession Number
ADA051000

Entities

People

  • R. J. Dufala

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Flow
  • Blade Tips
  • Flow Rate
  • Gas Flow
  • Governments
  • High Pressure
  • Hot Gases
  • Hypervelocity Flow
  • Jet Streams
  • Leading Edges
  • Materials
  • Measurement
  • Oxidation Resistance
  • Particle Size
  • Porous Metals
  • Surface Temperature
  • Tensile Strength

Readers

  • Aerodynamics.
  • Internal Combustion Engine (ICE) Technology.
  • Surface Engineering/Surface Coating Technology.