Accession Number : ADA130069

Title :   Testing of Felt-Ceramic Materials for Combustor Applications.

Descriptive Note : Final contractor rept.,


Personal Author(s) : Raman,R S Venkat ; Roffe,Gerald

PDF Url : ADA130069

Report Date : Apr 1983

Pagination or Media Count : 45

Abstract : The feasibility of using composite felt-ceramic materials as combustor liners was experimentally studied. The material consists of a porous felt pad sandwiched between a layer of ceramic and one of solid metal. Flat, rectangular test panels, which encompassed several design variations of the basic composite material, were tested, two at a time, in a premixed gas turbine combustor as sections of the combustor wall. Tests were conducted at combustor inlet conditions of 0.5 MPa and 533K with a reference velocity of 25 m/s. The panels were subjected to a hot gas temperature of 2170K with 1% of the total airflow used to film cool the ceramic surface of the test panel. In general, thin ceramic layers yield low ceramic stress levels with high felt-ceramic interface temperatures. On the other hand, thick ceramic layers result in low felt-ceramic interface temperatures but high ceramic stress levels. Extensive thermal cycling appears to cause material degradation, but for a limited number of cycles, the survivability of felt-ceramic materials, even under extremely severe combustor operating conditions, was conclusively demonstrated.

Descriptors :   *Combustion chamber liners, *Composite materials, *Felts, *Ceramic materials, Feasibility studies, Experimental design, Cyclic tests, Combustors, Gas turbines, High temperature, Velocity, Air flow, Crack propagation, Cracking(Fracturing), Thermal degradation, Survivability

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE