[go: up one dir, main page]

GB1193372A - A Silencer for Jet Systems - Google Patents

A Silencer for Jet Systems

Info

Publication number
GB1193372A
GB1193372A GB2637/68A GB263768A GB1193372A GB 1193372 A GB1193372 A GB 1193372A GB 2637/68 A GB2637/68 A GB 2637/68A GB 263768 A GB263768 A GB 263768A GB 1193372 A GB1193372 A GB 1193372A
Authority
GB
United Kingdom
Prior art keywords
jet
elements
undulations
flow
duct
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
GB2637/68A
Inventor
Louis Francois Jumelle
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.)
Safran Aircraft Engines SAS
Original Assignee
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
SNECMA SAS
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 Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA, SNECMA SAS filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of GB1193372A publication Critical patent/GB1193372A/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
    • F02K1/28—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto using fluid jets to influence the jet flow
    • F02K1/34—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto using fluid jets to influence the jet flow for attenuating noise
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

1,193,372. Jet propulsion nozzles. SOC. NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION. Jan. 17, 1968 [Jan. 18, 1967], No. 2637/68. Heading F1J. A silencer for a jet system, e.g. a propulsion nozzle, of the kind in which controllable elements distributed around the jet can be moved into a silencing position in which they project into the jet to produce undulations in the flow has secondary elements carried by at least some of the controllable elements so that when the latter are moved into the silencing position the secondary elements produce additional undulations in the flow between the undulations produced by consecutive controllable elements. The jet system comprises a primary hot gas duct 1 surrounded by a fairing 4 to form a secondary air duct 10. Hollow triangular section silencing elements 11 are pivotally mounted around the fairing 4 such that in the inoperative position they nestle within the hollow wall of the fairing. The elements 11 can be swung about generally longitudinal axes 11c into a silencing position in which each element 11 projects into the jet 3 leaving the primary duct 1 to produce an undulation 18 in the flow and assist mixing of the jet with the secondary air from duct 10. Mixing is further assisted by a stream of air 12 flowing through the interior of each element 11 into the jet 3. Additional undulations 18a in the flow are set up by plates 15 secured by flat bars 16, 17 to respective elements 11 so as to be movable therewith. In a modification, Figs. 5, 6(not shown), the additional undulations 18a are produced by fluid injectors (23) mounted on the elements 11 and supplied, in the case of a jet propulsion engine, with air from a compressor of the engine. An element 11 may carry both a plate 15 and fluid and a fluid injector (23).
GB2637/68A 1967-01-18 1968-01-17 A Silencer for Jet Systems Expired GB1193372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR91661A FR1515199A (en) 1967-01-18 1967-01-18 Mixed silencer for composite propulsion nozzles

Publications (1)

Publication Number Publication Date
GB1193372A true GB1193372A (en) 1970-05-28

Family

ID=8624061

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2637/68A Expired GB1193372A (en) 1967-01-18 1968-01-17 A Silencer for Jet Systems

Country Status (2)

Country Link
FR (1) FR1515199A (en)
GB (1) GB1193372A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682269A (en) * 1970-04-21 1972-08-08 Snecma Device for reducing the noise of a gaseous jet
US3721314A (en) * 1971-01-20 1973-03-20 Snecma Silencer or muffler for the composite nozzle of an aircraft jet engine
GB2374121A (en) * 2001-03-03 2002-10-09 Rolls Royce Plc Gas turbine engine nozzle with noise-reducing tabs
EP1703114A1 (en) * 2005-03-15 2006-09-20 Rolls-Royce plc Engine noise

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3682269A (en) * 1970-04-21 1972-08-08 Snecma Device for reducing the noise of a gaseous jet
US3721314A (en) * 1971-01-20 1973-03-20 Snecma Silencer or muffler for the composite nozzle of an aircraft jet engine
GB2374121A (en) * 2001-03-03 2002-10-09 Rolls Royce Plc Gas turbine engine nozzle with noise-reducing tabs
US6813877B2 (en) 2001-03-03 2004-11-09 Rolls-Royce Plc Gas turbine engine exhaust nozzle having a noise attenuation device driven by shape memory material actuators
GB2374121B (en) * 2001-03-03 2005-03-23 Rolls Royce Plc Gas turbine engine exhaust nozzle
EP1703114A1 (en) * 2005-03-15 2006-09-20 Rolls-Royce plc Engine noise
US7735601B1 (en) 2005-03-15 2010-06-15 Rolls-Royce Plc Engine noise

Also Published As

Publication number Publication date
FR1515199A (en) 1968-03-01

Similar Documents

Publication Publication Date Title
US4275857A (en) Cooling system for ramjet engine
GB757496A (en) Improvements in arrangement for controlling the air-intake orifices of jet propulsion units
GB726290A (en) Improvements in or relating to variable area nozzles for jet propulsion power plant
GB1048645A (en) Aerodynamic or hydrodynamic servo-valve, especially for use for the guidance and stabilisation of rockets
GB782323A (en) Improvements in devices for regulating the effective cross-section of a discharge nozzle
GB834907A (en) Improvements in or relating to jet propulsion nozzles
GB1138679A (en) Wall element for combustion chambers
GB955768A (en) Improvements in combined turbojet-ramjet units
GB1165548A (en) A Gas Ejection System, for Example a Jet Propulsion Nozzle.
GB1193372A (en) A Silencer for Jet Systems
GB1090147A (en) Thrust nozzle for supersonic gas turbine jet engines of the by-pass type
GB1141784A (en) Nozzles capable of having a silencing effect
US3279191A (en) Gas turbine power plant
US3340690A (en) Boundary layer control for detonation ramjets
GB822299A (en) Improvements in or relating to devices for steering jet propelled aircraft
US3486699A (en) Adjustable exhaust unit for turbojet propulsion engines
GB922876A (en) Jet-propelled aircraft with vertical take-off means
GB974722A (en) Gas turbine jet propulsion engine
GB758675A (en) Jet pipes for jet-propulsion engines
GB827744A (en) Improvements in or relating to apparatus for deflecting a gaseous stream flowing through an annular structure of an aircraft or aircraft engine
GB1383651A (en) Jet propulsion nozzles
GB733727A (en) Improvements in arrangements for deflecting fluid jets
GB788360A (en) An aircraft jet propulsion system and a discharge nozzle for the propulsive jet stream
GB1149168A (en) A propulsion unit comprising a gas turbine engine and a ram-jet
GB796027A (en) Improvements in jet propulsion nozzles

Legal Events

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