DE3540943A1 - Gasturbinenstrahltriebwerk in mehr-wellen-zweistrom-bauweise - Google Patents

Gasturbinenstrahltriebwerk in mehr-wellen-zweistrom-bauweise

Info

Publication number
DE3540943A1
DE3540943A1 DE19853540943 DE3540943A DE3540943A1 DE 3540943 A1 DE3540943 A1 DE 3540943A1 DE 19853540943 DE19853540943 DE 19853540943 DE 3540943 A DE3540943 A DE 3540943A DE 3540943 A1 DE3540943 A1 DE 3540943A1
Authority
DE
Germany
Prior art keywords
air
engine according
engine
valves
cooling
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.)
Granted
Application number
DE19853540943
Other languages
German (de)
English (en)
Other versions
DE3540943C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html
Inventor
Claus Burkhardt
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.)
MTU Aero Engines AG
Original Assignee
MTU Motoren und Turbinen Union Muenchen GmbH
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 MTU Motoren und Turbinen Union Muenchen GmbH filed Critical MTU Motoren und Turbinen Union Muenchen GmbH
Priority to DE19853540943 priority Critical patent/DE3540943A1/de
Priority to DE3546839A priority patent/DE3546839C2/de
Priority to FR868615046A priority patent/FR2590320B1/fr
Priority to IT8622288A priority patent/IT1213376B/it
Priority to GB8627581A priority patent/GB2183296B/en
Priority to US06/932,280 priority patent/US4841726A/en
Publication of DE3540943A1 publication Critical patent/DE3540943A1/de
Application granted granted Critical
Publication of DE3540943C2 publication Critical patent/DE3540943C2/de
Granted 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
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
    • F01D11/20—Actively adjusting tip-clearance
    • F01D11/24—Actively adjusting tip-clearance by selectively cooling-heating stator or rotor components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/26—Double casings; Measures against temperature strain in casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/12—Cooling of plants
    • F02C7/16—Cooling of plants characterised by cooling medium
    • F02C7/18—Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
    • F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
    • F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
    • F02K3/06—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type with front fan
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
DE19853540943 1985-11-19 1985-11-19 Gasturbinenstrahltriebwerk in mehr-wellen-zweistrom-bauweise Granted DE3540943A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE19853540943 DE3540943A1 (de) 1985-11-19 1985-11-19 Gasturbinenstrahltriebwerk in mehr-wellen-zweistrom-bauweise
DE3546839A DE3546839C2 (de) 1985-11-19 1985-11-19 Gasturbinenstrahltriebwerk in Mehrwellen-Zweistrombauweise
FR868615046A FR2590320B1 (fr) 1985-11-19 1986-10-29 Turboreacteur a deux flux et plusieurs arbres a refroidissement par l'intermediaire du canal secondaire s'etendant pratiquement sur toute la longueur de la machine
IT8622288A IT1213376B (it) 1985-11-19 1986-11-11 Turbina a gas in modalita'propulsore a turbogetto con costruttiva multialbero e due correnti.
GB8627581A GB2183296B (en) 1985-11-19 1986-11-19 Gas turbine jet propulsion unit of multi-shaft double-flow construction
US06/932,280 US4841726A (en) 1985-11-19 1986-11-19 Gas turbine jet engine of multi-shaft double-flow construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853540943 DE3540943A1 (de) 1985-11-19 1985-11-19 Gasturbinenstrahltriebwerk in mehr-wellen-zweistrom-bauweise

Publications (2)

Publication Number Publication Date
DE3540943A1 true DE3540943A1 (de) 1987-05-21
DE3540943C2 DE3540943C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1992-01-23

Family

ID=6286342

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19853540943 Granted DE3540943A1 (de) 1985-11-19 1985-11-19 Gasturbinenstrahltriebwerk in mehr-wellen-zweistrom-bauweise
DE3546839A Expired - Lifetime DE3546839C2 (de) 1985-11-19 1985-11-19 Gasturbinenstrahltriebwerk in Mehrwellen-Zweistrombauweise

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE3546839A Expired - Lifetime DE3546839C2 (de) 1985-11-19 1985-11-19 Gasturbinenstrahltriebwerk in Mehrwellen-Zweistrombauweise

Country Status (5)

Country Link
US (1) US4841726A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE3540943A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2590320B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB2183296B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT1213376B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3817986A1 (de) * 1988-05-27 1989-12-07 Mtu Muenchen Gmbh Gasturbinenanlage mit zwischenkuehlung
DE10032454A1 (de) * 2000-07-04 2002-01-17 Man Turbomasch Ag Ghh Borsig Vorrichtung zum Kühlen eines ungleichmäßig stark temperaturbelasteten Bauteiles
DE4244302C2 (de) * 1992-12-28 2002-08-29 Alstom Vorrichtung zur Prallkühlung
US6779967B2 (en) 2001-12-12 2004-08-24 Rolls-Royce Deutschland Ltd & Co Kg Device for air mass flow control
DE102011106961A1 (de) * 2011-07-08 2013-01-10 Rolls-Royce Deutschland Ltd & Co Kg Fluggasturbinentriebwerk mit Kühlelementen am Kerntriebwerksgehäuse
EP2224099A3 (de) * 2009-02-26 2013-02-27 Rolls-Royce Deutschland Ltd & Co KG Laufspalteinstellungssystem einer Fluggasturbine
US9194331B2 (en) 2012-08-09 2015-11-24 MTU Aero Engines AG Flow conducting assembly for cooling the low-pressure turbine housing of a gas turbine jet engine
EP3139007A1 (de) * 2015-09-07 2017-03-08 MTU Aero Engines GmbH Vorrichtung zum begrenzen eines strömungskanals einer strömungsmaschine
DE102017117291A1 (de) * 2017-07-31 2019-01-31 Rolls-Royce Deutschland Ltd & Co Kg Luftführungsvorrichtung in einem Flugzeugtriebwerk
EP4407148A1 (en) * 2023-01-26 2024-07-31 Pratt & Whitney Canada Corp. Ram air driven blade tip clearance control system for turboprop engines

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US5054996A (en) * 1990-07-27 1991-10-08 General Electric Company Thermal linear actuator for rotor air flow control in a gas turbine
WO1992017686A1 (en) * 1991-04-02 1992-10-15 Rolls-Royce Plc Turbine casing
US5152666A (en) * 1991-05-03 1992-10-06 United Technologies Corporation Stator assembly for a rotary machine
US5205115A (en) * 1991-11-04 1993-04-27 General Electric Company Gas turbine engine case counterflow thermal control
FR2683851A1 (fr) * 1991-11-20 1993-05-21 Snecma Turbomachine equipee de moyens facilitant le reglage des jeux du stator entree stator et rotor.
US5219268A (en) * 1992-03-06 1993-06-15 General Electric Company Gas turbine engine case thermal control flange
US5351478A (en) * 1992-05-29 1994-10-04 General Electric Company Compressor casing assembly
JP3415663B2 (ja) 1992-12-28 2003-06-09 アルストム 冷却面を衝撃式に冷却するための装置
US5363654A (en) * 1993-05-10 1994-11-15 General Electric Company Recuperative impingement cooling of jet engine components
DE4324125A1 (de) * 1993-07-19 1995-01-26 Abb Management Ag Gasturbine
US5636659A (en) * 1995-10-17 1997-06-10 Westinghouse Electric Corporation Variable area compensation valve
FR2742479B1 (fr) * 1995-12-13 1998-01-16 Snecma Dispositif de refroidissement d'un turbomoteur sur aeronef
GB9709086D0 (en) * 1997-05-07 1997-06-25 Rolls Royce Plc Gas turbine engine cooling apparatus
DE19807247C2 (de) 1998-02-20 2000-04-20 Mtu Muenchen Gmbh Strömungsmaschine mit Rotor und Stator
US6035627A (en) * 1998-04-21 2000-03-14 Pratt & Whitney Canada Inc. Turbine engine with cooled P3 air to impeller rear cavity
US6227800B1 (en) * 1998-11-24 2001-05-08 General Electric Company Bay cooled turbine casing
DE10019437A1 (de) * 2000-04-19 2001-12-20 Rolls Royce Deutschland Verfahren und Vorrichtung zum Kühlen der Gehäuse von Turbinen von Strahltriebwerken
US6944580B1 (en) * 2000-06-30 2005-09-13 United Technologies Corporation Method and system for designing frames and cases
GB2365495B (en) * 2000-08-04 2004-04-21 Rolls Royce Plc Cooling arrangement
RU2251012C2 (ru) * 2003-04-16 2005-04-27 Федеральное государственное унитарное предприятие "Центральный институт авиационного моторостроения им. П.И. Баранова" Устройство предотвращения помпажа авиационного двухконтурного турбореактивного двигателя (трдд) на взлетном режиме
RU2260702C1 (ru) * 2004-03-18 2005-09-20 Федеральное государственное унитарное предприятие "Центральный институт авиационного моторостроения им. П.И. Баранова" Способ предотвращения помпажа авиационного двухконтурного турборективного двигателя (трдд) на взлетном режиме и устройство для его осуществления
FR2902830B1 (fr) * 2006-06-27 2008-08-08 Airbus France Sas Turboreacteur pour aeronef
US8650854B2 (en) 2006-10-12 2014-02-18 United Technologies Corporation Bifurcation and aft vent used to vary fan nozzle exit area
US8434997B2 (en) 2007-08-22 2013-05-07 United Technologies Corporation Gas turbine engine case for clearance control
US8092153B2 (en) * 2008-12-16 2012-01-10 Pratt & Whitney Canada Corp. Bypass air scoop for gas turbine engine
DE102009011635A1 (de) * 2009-03-04 2010-09-09 Rolls-Royce Deutschland Ltd & Co Kg Luftleitelement eines Laufspalteinstellungssystems einer Fluggasturbine
FR2961250B1 (fr) * 2010-06-14 2012-07-20 Snecma Dispositif de refroidissement des alveoles d'un disque de rotor de turbomachine a l'aval du cone d'entrainement
GB201104043D0 (en) * 2011-03-10 2011-04-20 Rolls Royce Plc A gas turbine engine
EP2518278A1 (en) 2011-04-28 2012-10-31 Siemens Aktiengesellschaft Turbine casing cooling channel with cooling fluid flowing upstream
JP5478576B2 (ja) * 2011-09-20 2014-04-23 株式会社日立製作所 ガスタービン
DE102012100646B4 (de) * 2012-01-26 2017-03-16 Saxess Holding Gmbh Turbinen- und Generatorgehäuse
US9828880B2 (en) * 2013-03-15 2017-11-28 General Electric Company Method and apparatus to improve heat transfer in turbine sections of gas turbines
DE102015215144B4 (de) * 2015-08-07 2017-11-09 MTU Aero Engines AG Vorrichtung und Verfahren zum Beeinflussen der Temperaturen in Innenringsegmenten einer Gasturbine
US10138752B2 (en) 2016-02-25 2018-11-27 General Electric Company Active HPC clearance control
US10697314B2 (en) 2016-10-14 2020-06-30 Rolls-Royce Corporation Turbine shroud with I-beam construction
FR3058459B1 (fr) * 2016-11-04 2018-11-09 Safran Aircraft Engines Dispositif de refroidissement pour une turbine d'une turbomachine
US10774664B2 (en) * 2017-06-08 2020-09-15 General Electric Company Plenum for cooling turbine flowpath components and blades
FR3067751B1 (fr) * 2017-06-15 2019-07-12 Safran Aircraft Engines Dispositif de refroidissement d'un carter annulaire externe de turbine
US10612466B2 (en) * 2017-09-11 2020-04-07 United Technologies Corporation Gas turbine engine active clearance control system using inlet particle separator
US10557365B2 (en) 2017-10-05 2020-02-11 Rolls-Royce Corporation Ceramic matrix composite blade track with mounting system having reaction load distribution features
GB201718234D0 (en) * 2017-11-03 2017-12-20 Rolls Royce Plc Cooling Arrangement for a turbine casing of a gas turbine engine
US10718267B2 (en) * 2017-12-14 2020-07-21 Rolls-Royce Corporation Turbine engine cooling with substantially uniform cooling air flow distribution
FR3082551B1 (fr) 2018-06-13 2021-01-08 Airbus Operations Sas Systeme de propulsion d'un aeronef comportant une structure interieure fixe presentant une fente d'evacuation
FR3098549B1 (fr) * 2019-07-11 2021-07-09 Safran Aircraft Engines Systeme de refroidissement pour carter de turbomachine
US11149563B2 (en) 2019-10-04 2021-10-19 Rolls-Royce Corporation Ceramic matrix composite blade track with mounting system having axial reaction load distribution features
FR3112811B1 (fr) * 2020-07-23 2022-07-22 Safran Aircraft Engines Turbine à cavités pressurisées
US11614037B2 (en) * 2021-01-26 2023-03-28 General Electric Company Method and system for bleed flow power generation
US11821326B2 (en) * 2021-04-27 2023-11-21 General Electric Company Turbine containment system
CN115182815B (zh) * 2022-05-31 2024-04-19 中国航发四川燃气涡轮研究院 具有可变几何的多涵道变循环加力燃烧室
US11702951B1 (en) * 2022-06-10 2023-07-18 Pratt & Whitney Canada Corp. Passive cooling system for tip clearance optimization
US20230417150A1 (en) * 2022-06-22 2023-12-28 Pratt & Whitney Canada Corp. Augmented cooling for tip clearance optimization

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US3029064A (en) * 1958-07-11 1962-04-10 Napier & Son Ltd Temperature control apparatus for turbine cases
DE2044800A1 (de) * 1969-10-02 1971-04-15 Gen Electric Temperaturgesteuerte Abdeckung und Halterung fur Gasturbinen
DE2654300A1 (de) * 1975-12-05 1977-06-08 United Technologies Corp Turbinentriebwerk
DE2718610A1 (de) * 1976-08-02 1978-02-09 Gen Electric Verfahren zum verbessern der turbinenleistungsfaehigkeit
US4271666A (en) * 1979-08-20 1981-06-09 Avco Corporation Integral infrared radiation suppressor for a turbofan engine
US4304093A (en) * 1979-08-31 1981-12-08 General Electric Company Variable clearance control for a gas turbine engine
US4338061A (en) * 1980-06-26 1982-07-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Control means for a gas turbine engine
DE3239637A1 (de) * 1981-11-02 1983-05-11 United Technologies Corp., 06101 Hartford, Conn. Verfahren und vorrichtung zur spaltsteuerung in einem gasturbinentriebwerk
US4487016A (en) * 1980-10-01 1984-12-11 United Technologies Corporation Modulated clearance control for an axial flow rotary machine
GB2146707A (en) * 1983-09-14 1985-04-24 Rolls Royce Turbine
DE3446389A1 (de) * 1983-12-21 1985-07-04 United Technologies Corp., Hartford, Conn. Statoraufbau fuer ein gasturbinen-triebwerk

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US3029064A (en) * 1958-07-11 1962-04-10 Napier & Son Ltd Temperature control apparatus for turbine cases
DE2044800A1 (de) * 1969-10-02 1971-04-15 Gen Electric Temperaturgesteuerte Abdeckung und Halterung fur Gasturbinen
DE2654300A1 (de) * 1975-12-05 1977-06-08 United Technologies Corp Turbinentriebwerk
DE2718610A1 (de) * 1976-08-02 1978-02-09 Gen Electric Verfahren zum verbessern der turbinenleistungsfaehigkeit
US4271666A (en) * 1979-08-20 1981-06-09 Avco Corporation Integral infrared radiation suppressor for a turbofan engine
US4304093A (en) * 1979-08-31 1981-12-08 General Electric Company Variable clearance control for a gas turbine engine
US4338061A (en) * 1980-06-26 1982-07-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Control means for a gas turbine engine
US4487016A (en) * 1980-10-01 1984-12-11 United Technologies Corporation Modulated clearance control for an axial flow rotary machine
DE3239637A1 (de) * 1981-11-02 1983-05-11 United Technologies Corp., 06101 Hartford, Conn. Verfahren und vorrichtung zur spaltsteuerung in einem gasturbinentriebwerk
GB2146707A (en) * 1983-09-14 1985-04-24 Rolls Royce Turbine
DE3446389A1 (de) * 1983-12-21 1985-07-04 United Technologies Corp., Hartford, Conn. Statoraufbau fuer ein gasturbinen-triebwerk

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3817986A1 (de) * 1988-05-27 1989-12-07 Mtu Muenchen Gmbh Gasturbinenanlage mit zwischenkuehlung
DE4244302C2 (de) * 1992-12-28 2002-08-29 Alstom Vorrichtung zur Prallkühlung
DE10032454A1 (de) * 2000-07-04 2002-01-17 Man Turbomasch Ag Ghh Borsig Vorrichtung zum Kühlen eines ungleichmäßig stark temperaturbelasteten Bauteiles
US6568902B2 (en) 2000-07-04 2003-05-27 Man Turbomaschinen Ag Ghh Borsig Device for cooling a component subject to temperature stress of nonuniform intensity
US6779967B2 (en) 2001-12-12 2004-08-24 Rolls-Royce Deutschland Ltd & Co Kg Device for air mass flow control
EP2224099A3 (de) * 2009-02-26 2013-02-27 Rolls-Royce Deutschland Ltd & Co KG Laufspalteinstellungssystem einer Fluggasturbine
US8834108B2 (en) 2009-02-26 2014-09-16 Rolls-Royce Deutschland Ltd & Co Kg Running-gap control system of an aircraft gas turbine
DE102011106961A1 (de) * 2011-07-08 2013-01-10 Rolls-Royce Deutschland Ltd & Co Kg Fluggasturbinentriebwerk mit Kühlelementen am Kerntriebwerksgehäuse
US9194331B2 (en) 2012-08-09 2015-11-24 MTU Aero Engines AG Flow conducting assembly for cooling the low-pressure turbine housing of a gas turbine jet engine
EP3139007A1 (de) * 2015-09-07 2017-03-08 MTU Aero Engines GmbH Vorrichtung zum begrenzen eines strömungskanals einer strömungsmaschine
DE102015217078A1 (de) * 2015-09-07 2017-03-09 MTU Aero Engines AG Vorrichtung zum Begrenzen eines Strömungskanals einer Strömungsmaschine
DE102017117291A1 (de) * 2017-07-31 2019-01-31 Rolls-Royce Deutschland Ltd & Co Kg Luftführungsvorrichtung in einem Flugzeugtriebwerk
EP3438419A1 (de) * 2017-07-31 2019-02-06 Rolls-Royce Deutschland Ltd & Co KG Luftführungsvorrichtung in einem flugzeugtriebwerk
EP4407148A1 (en) * 2023-01-26 2024-07-31 Pratt & Whitney Canada Corp. Ram air driven blade tip clearance control system for turboprop engines

Also Published As

Publication number Publication date
IT1213376B (it) 1989-12-20
DE3540943C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1992-01-23
IT8622288A0 (it) 1986-11-11
FR2590320A1 (fr) 1987-05-22
GB8627581D0 (en) 1986-12-17
US4841726A (en) 1989-06-27
GB2183296B (en) 1989-10-04
GB2183296A (en) 1987-06-03
FR2590320B1 (fr) 1993-08-27
DE3546839C2 (de) 1995-05-04

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