GB1321073A - Acoustic attenuators - Google Patents

Acoustic attenuators

Info

Publication number
GB1321073A
GB1321073A GB1321073DA GB1321073A GB 1321073 A GB1321073 A GB 1321073A GB 1321073D A GB1321073D A GB 1321073DA GB 1321073 A GB1321073 A GB 1321073A
Authority
GB
United Kingdom
Prior art keywords
panel
acoustic
air
layer
porous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of GB1321073A publication Critical patent/GB1321073A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/827—Sound absorbing structures or liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Exhaust Silencers (AREA)

Abstract

1321073 Gas turbine engines; acoustic attenuators DEFENCE SECRETARY OF STATE FOR 11 June 1971 [18 June 1970] 29531/70 Heading F1J [Also in Division F2] A gas turbine engine acoustic attenuator comprises an acoustic panel which includes at least a porous facing layer through which a variable flow of air is passed, the impedance of the acoustic panel being varied by varying the supply of air through the porous layer. One such acoustic panel comprises an impervious backing layer 30, a number of channels 32 defined by dividers 34, and a porous facing layer 36. In order to vary the impedance of the panel air is pumped along the channels 32 and through the apertures 38 in the facing layer, the mass flow of air depending upon the particular engine conditions for which the panel is being tuned. The panel may alternatively be of the honeycomb type providing there is communication between adjacent cells.
GB1321073D 1970-06-18 1970-06-18 Acoustic attenuators Expired GB1321073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2953170 1970-06-18

Publications (1)

Publication Number Publication Date
GB1321073A true GB1321073A (en) 1973-06-20

Family

ID=10293010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1321073D Expired GB1321073A (en) 1970-06-18 1970-06-18 Acoustic attenuators

Country Status (4)

Country Link
DE (1) DE2129962A1 (en)
FR (1) FR2095330B1 (en)
GB (1) GB1321073A (en)
IT (1) IT941415B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217767C1 (en) * 1992-05-29 1993-08-26 Deutsche Aerospace Ag, 8000 Muenchen, De
US6811372B1 (en) 1999-12-07 2004-11-02 A2 Acoustics Ab Device at an acoustic liner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB633120A (en) * 1946-11-21 1949-12-12 Silto S A Improvements relating to the silencing of gaseous currents
US3181646A (en) * 1963-04-15 1965-05-04 Howard C Edwards Silencer having contiguous concentric layers of sound absorbent material
US3362629A (en) * 1965-12-21 1968-01-09 Carrier Corp Centrifugal compressor
US3380552A (en) * 1966-11-28 1968-04-30 Luminous Ceilings Inc Acoustical panel with honeycomb core and ventilation passageways

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4217767C1 (en) * 1992-05-29 1993-08-26 Deutsche Aerospace Ag, 8000 Muenchen, De
US6811372B1 (en) 1999-12-07 2004-11-02 A2 Acoustics Ab Device at an acoustic liner

Also Published As

Publication number Publication date
FR2095330A1 (en) 1972-02-11
IT941415B (en) 1973-03-01
FR2095330B1 (en) 1975-07-11
DE2129962A1 (en) 1972-02-24

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee