Ferrous Fibre Network Materials for Jet Noise Reduction in Aeroengines Part II: Thermo‐Mechanical Stability

This paper describes an investigation into the thermo-mechanical stability of highly porous fibre network materials, proposed for use in the exhaust containment region of gas turbine aeroengines, in order to generate acoustic damping. The materials studied are (grade 304) stainless steel single fibres and sintered fibre networks, with relative densities of 5, 10 and 15 %. A network density of about 10 % is identified as offering an optimal combination of thermo-mechanical stability in the environment concerned and effective acoustic damping (see Part I).