Accession Number : ADA137454

Title :   Ceramic Composite Liner Material for Gas Turbine Combustors.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Personal Author(s) : Ercegovic,D B ; Walker,C L ; Norgren,C T

PDF Url : ADA137454

Report Date : Jan 1983

Pagination or Media Count : 19

Abstract : Advanced commercial and military gas turbine engines may operate at combustor outlet temperatures in excess of 1920 K (3000 K). At these temperatures combustors liners experience extreme convective and radiative heat fluxes. The ability of plasma sprayed ceramic coating to reduce liner metal temperature has been recognized. However, the brittleness of the ceramic layer and the difference in thermal expansion with the metal substrate has caused cracking, spalling and some separation of the ceramic coating. Research directed at turbine tip seals (or shrouds) has shown the advantage of applying the ceramic to a compliant metal pad. This paper discusses recent studies of applying ceramics to combustor liners in which yttria stabilized zirconia plasma sprayed on compliant metal substrates which were exposed to near stoichiometric combustion, presents performance and durability results, and describes a conceptual design for an advanced, small gas turbine combustor. Test specimens were convectively cooled or convective-transpiration cooled and were evaluated in a 10 cm square flame tube combustor at inlet air temperatures of 533 K (500 deg F) and at a pressure of 0.5 MPa (75 psia). The ceramics were exposed to flame temperatures in excess of 2000 K (3320 deg F). Results appear very promising with all 30 specimens surviving a screening test and one of two specimens surviving a cyclic durability test. (Author)

Descriptors :   *Ceramic materials, *Ceramic coatings, *Linings, *Combustors, *Combustion chamber liners, Gas turbines, Thermal properties, Thermal resistance, High temperature, Thermal stability, Heat flux

Subject Categories : Ceramics, Refractories and Glass
      Coatings, Colorants and Finishes
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE