| 摘要 |
An abradable liner 112 for a gas turbine engine fan stage 110 comprising a plurality of abradable layers bonded together, wherein at least one visual indicator is embedded in the plurality of abradable layers. The, or each, indicator may be coloured strips of material placed towards the leading and trailing edges of the fan blade in use. The at least one indicator is preferably located at a radially outer edge of the liner at a depth indicative of maximum tolerable wear. There may be a plurality of embedded indicators of different colours at different layers with at least one indicator extending at least between the trailing edge and leading edge of the fan blade tip in use. The liner may comprise a plurality of arcuate segments releasably attached to each other. Preferably the, or each, indicator includes a dye or adhesive. The invention provides quick and reliable information as to the extent and pattern of wear in an attrition liner. |
