GB889688A - Improvements in or relating to corrugated nozzles - Google Patents

Improvements in or relating to corrugated nozzles

Info

Publication number
GB889688A
GB889688A GB14397/57A GB1439757A GB889688A GB 889688 A GB889688 A GB 889688A GB 14397/57 A GB14397/57 A GB 14397/57A GB 1439757 A GB1439757 A GB 1439757A GB 889688 A GB889688 A GB 889688A
Authority
GB
United Kingdom
Prior art keywords
tubular structure
corrugations
flap
channel
nozzle
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
GB14397/57A
Inventor
Samuel Robinson
Antony Vernon Nelson Reed
Stanley George Hooker
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.)
Bristol Siddeley Engines Ltd
Original Assignee
Bristol Siddeley Engines Ltd
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 Bristol Siddeley Engines Ltd filed Critical Bristol Siddeley Engines Ltd
Priority to GB14397/57A priority Critical patent/GB889688A/en
Publication of GB889688A publication Critical patent/GB889688A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F02K1/06—Varying effective area of jet pipe or nozzle
    • F02K1/12—Varying effective area of jet pipe or nozzle by means of pivoted flaps
    • F02K1/1207—Varying effective area of jet pipe or nozzle by means of pivoted flaps of one series of flaps hinged at their upstream ends on a fixed structure
    • 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
    • F02K1/06—Varying effective area of jet pipe or nozzle
    • F02K1/08—Varying effective area of jet pipe or nozzle by axially moving or transversely deforming an internal member, e.g. the exhaust cone
    • 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
    • F02K1/46—Nozzles having means for adding air to the jet or for augmenting the mixing region between the jet and the ambient air, e.g. for silencing
    • F02K1/48—Corrugated nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/60—Structure; Surface texture
    • F05D2250/61—Structure; Surface texture corrugated

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)

Abstract

889,688. Jet propulsion nozzles. BRISTOL SIDDELEY ENGINES Ltd. May 6, 1958 [May 6, 1957], No. 14397/57. Class 110 (3). A corrugated nozzle for reducing the noise of jet propulsion engines comprises a tubular structure of generally circular cross-section with a series of circumferentially spaced V- shaped corrugations having the apex of the V nearer the axis of the nozzle and having plane walls which are inclined to each other in both the radial and axial directions so that each pair of corrugations defines between them a channel which deepens and narrows progressively from the upstream to the downstream end. As shown, the tubular structure 10 has six equally spaced corrugations 14 with side walls 18 defining between them channels 16 of substantially rectangular section which becoming progressively wider and shallower towards the inlet where they merge with the tubular structure 10. The radial dimension of each channel is greater than the circumferential dimension and may be 0.25 of the maximum diameter of the nozzle. The corrugations are reinforced by axially spaced arched stiffeners 19, 20, the most downstream of which 20 is set back from the apex of the corrugation. The corrugations form flutes in the external wall of the tubular structure 10 through which flutes cooling air flows to penetrate furthest into the jet stream. The tubular structure 10 is reinforced by hoops 13 and rings 11, 12. A hinged trimmer flap 30 is pivoted in one of the channels 16 between the walls 18. The flap is hinged to the tubular structure and carries a vane 33 displaceable in a balance chamber 31 by air under pressure conveniently tapped from the engine compressor delivery and supplied by a pipe 35. The flap is movable to and from an operative position in which it obstructs the gas flow in the channel.
GB14397/57A 1957-05-06 1957-05-06 Improvements in or relating to corrugated nozzles Expired GB889688A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB14397/57A GB889688A (en) 1957-05-06 1957-05-06 Improvements in or relating to corrugated nozzles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14397/57A GB889688A (en) 1957-05-06 1957-05-06 Improvements in or relating to corrugated nozzles

Publications (1)

Publication Number Publication Date
GB889688A true GB889688A (en) 1962-02-21

Family

ID=10040457

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14397/57A Expired GB889688A (en) 1957-05-06 1957-05-06 Improvements in or relating to corrugated nozzles

Country Status (1)

Country Link
GB (1) GB889688A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458008A (en) * 1966-12-28 1969-07-29 Us Navy Jet engine noise suppressor
WO2010011381A1 (en) * 2008-06-26 2010-01-28 General Electric Company Duplex tab exhaust nozzle
EP2072793A3 (en) * 2007-12-21 2011-09-14 Rolls-Royce Deutschland Ltd & Co KG Nozzle with guiding elements

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458008A (en) * 1966-12-28 1969-07-29 Us Navy Jet engine noise suppressor
EP2072793A3 (en) * 2007-12-21 2011-09-14 Rolls-Royce Deutschland Ltd & Co KG Nozzle with guiding elements
US8307659B2 (en) 2007-12-21 2012-11-13 Rolls-Royce Deutschland Ltd & Co Kg Nozzle with guiding elements
WO2010011381A1 (en) * 2008-06-26 2010-01-28 General Electric Company Duplex tab exhaust nozzle
GB2474377A (en) * 2008-06-26 2011-04-13 Gen Electric Duplex tab exhaust nozzle
US8087250B2 (en) 2008-06-26 2012-01-03 General Electric Company Duplex tab exhaust nozzle
GB2474377B (en) * 2008-06-26 2012-02-29 Gen Electric Duplex tab exhaust nozzle

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