Stock material or miscellaneous articles – Structurally defined web or sheet – Honeycomb-like
Patent
1976-02-02
1977-07-12
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Honeycomb-like
428 73, 428131, 181 33HA, B32B 312
Patent
active
040355357
ABSTRACT:
Use of bulk sound absorber-backed spaced-cell honeycomb structures as sound attenuating liners in the flow ducts of gas turbine engines involves the disadvantage that the bulk absorber may soak up water or fuel present in the honeycomb after entry thereinto from the flow duct. In order to drain away liquid before it comes into contact with the bulk absorber, each honeycomb cell communicates with surrounding cells via apertures in the cell walls through which the liquid can drain, and a perforated sheet is provided between the honeycomb layer and the bulk absorber layer. The perforations are such that sound can enter the bulk absorber layer, but the liquid does not, each perforation being a hole having a peripheral flange which protrudes away from the bulk absorber layer into the interior of a respective cell.
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Epstein Henry F.
Lesmes George F.
Rolls-Royce (1971) Limited
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