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    Porous Stainless Steel Compacts for Transpiration Cooling

    Published: 01 January 1953

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    The requirements for high strength at elevated temperatures in blades for jet engine turbine wheels are among the most stringent in materials engineering, and the specifications call for alloys high in such strategic materials as cobalt and columbium. Instead of using solid blades which attain temperatures substantially the same as those of the gas stream in which they operate, it has been suggested to use hollow blades which are cooled. The most efficient method of cooling consists in passing a stream of coolant through the walls of a porous blade. This method is called transpiration cooling. Porous blades can be produced by powder metallurgy.

    This investigation has the purpose of providing engineering data for materials to be used in transpiration-cooled blades, and in particular, the strength properties for porous materials having the necessary permeability for efficient transpiration cooling by air. These strength properties are determined at room temperature by tensile strength tests and in the temperature range of 800 to 1100 F likely to be encountered in the application by stress-rupture tests. Because exact data on the permeability required are not yet available and because the necessary permeability may vary in different designs, strength data as a function of permeability were determined for a number of austenitic materials which were compacted and sintered from alloy powders.

    Author Information:

    Lenel, F. V.
    Rensselaer Polytechnic Institute, Troy, N. Y.

    Reen, O. W.
    Rensselaer Polytechnic Institute, Troy, N. Y.

    Committee/Subcommittee: B09.02

    DOI: 10.1520/STP44038S