US2012156006A1PendingUtilityA1

Acoustic liner

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Individually held — no corporate assignee on recordPriority: Dec 15, 2010Filed: Dec 6, 2011Published: Jun 21, 2012
Est. expiryDec 15, 2030(~4.4 yrs left)· nominal 20-yr term from priority
Inventors:Paul MurrayRichard J. AstleyRie SugimotoAndrew John Kempton
G01N 25/02F05D 2250/38G01N 25/4833G01K 17/04F05D 2250/31F02C 7/045
32
PatentIndex Score
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Claims

Abstract

An acoustic liner for a gas turbine engine comprises a folded cavity with an opening and a resistive facing sheet covering the opening, characterised in that the folded cavity further comprises a resistive septum that increases attenuation at high frequencies. The presence of the septum permits the attenuation of noise over a much wider range of frequencies than in known liners. By suitable choice of the resistance and reactance of the septum and of its position in the cavity, the liner can provide low frequency attenuation comparable with known liners while also providing improved attenuation at higher frequencies.

Claims

exact text as granted — not AI-modified
1 . An acoustic liner for a gas turbine engine, comprising a folded cavity with an opening and a resistive facing sheet coveting the opening, characterised in that the folded cavity further comprises a resistive septum that increases attenuation at high frequencies. 
     
     
         2 . An acoustic liner as claimed in  claim 1 , in which the folded cavity has a single bend. 
     
     
         3 . An acoustic liner as claimed in  claim 2 , in which the bend turns the cavity through about 90 degrees. 
     
     
         4 . An acoustic liner as claimed in  claim 2 , in which the septum is located immediately before the bend. 
     
     
         5 . An acoustic liner as claimed in  claim 1 , in which the facing sheet has a resistance of between 0.1 and 4 ρc. 
     
     
         6 . An acoustic liner as claimed in  claim 1 , in which the facing sheet has a resistance of between 0.2 and 1 ρc. 
     
     
         7 . An acoustic liner as claimed in  claim 1 , in which the septum has a resistance of between 0.05 and 3 ρc. 
     
     
         8 . An acoustic liner as claimed in  claim 1 , in which the septum has a resistance of between 1 and 2 ρc. 
     
     
         9 . An acoustic liner as claimed in  claim 1 , and further comprising a honeycomb layer in the opening. 
     
     
         10 . A casing arrangement for a gas turbine engine, comprising a plurality of acoustic liners as claimed in  claim 1 . 
     
     
         11 . A gas turbine engine comprising a casing arrangement as claimed in  claim 10 .

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