Abstract: An offset annular combustion chamber for an airplane engine gas turbine, the chamber comprising a pilot head having a plurality of nozzle systems distributed on a pilot head chamber end wall interconnecting an inner longitudinally-extending side wall of the chamber to a pilot head outer longitudinally-extending side wall, and a take-off head that is radially and axially offset from the pilot head and comprising a plurality of nozzle systems distributed on a take-off head chamber end wall interconnecting the pilot head outer longitudinally-extending side wall and a take-off head outer longitudinally-extending side wall, the pilot head having at least N substantially identical nozzle systems with overall permeability PA adapted to lighting and to speeds close to idling, and the take-off head having at least 2N substantially identical nozzle systems of overall permeability PB, where PB is greater than or equal to PA, the permeability PA lying in the range 10% to 40% of the total air flow rate penetrating into th
Type:
Application
Filed:
August 27, 2002
Publication date:
January 22, 2004
Applicant:
SNECMA MOTEURS
Inventors:
Christophe Baudoin, Patrice Commaret, Eric Le Letty, Christophe Viguier
Abstract: The invention relates to a system for driving an accessory, such as a fuel pump or an oil pump in a turboengine, said system comprising an electric motor and further comprising an air turbine associated with said electric motor. Said air turbine is suitable for being fed with a flow of air taken from a compressor of said turboengine and contributing to driving the accessory. The system also includes a valve for controlling the flow of air taken from the compressor, which valve is in the closed position while the turboengine is starting.
Type:
Application
Filed:
July 14, 2003
Publication date:
January 22, 2004
Applicant:
SNECMA MOTEURS
Inventors:
Philippe Bouiller, Michel Franchet, Jean-Pierre Ruis
Abstract: A method of distributing the blades of a turbomachine rotor in which the radial and tangential static moments of a plurality of blades for making a rotor are initially measured, and then the blades are classified in pairs on the basis of a determined selection criterion depending on said previously measured two static moments, and finally the blades of the selected pairs are mounted one by one on the rotor in diametrically opposite positions. It is also possible to measure the axial static moment of the blades, with the classification in pairs then being performed while taking account also of the axial static moment as measured in this way.
Abstract: To support and point a load on a support element, the pointing device having distinct link arms distributed around the load. Each link arm having a flexible element having a first end connected to the support element via a first hinge having a single degree of freedom, and a second end connected to the load via a second hinge having a single degree of freedom. The pointing device also having at least one movement transmission element disposed between the support element and the load to point the load relative to the support element.
Abstract: A turbomachine comprises an annular shell of metal material containing in a gas flow direction F a fuel injection assembly, an annular combustion chamber of composite material, and an annular nozzle of metal material forming the fixed-blade inlet stage of a high pressure turbine, said nozzle being supported by the annular shell and being fixed thereto by first releasable fixing means, and provision being made for the combustion chamber to be mounted in floating manner inside the annular shell and held in position solely by the nozzle to which it is fixed in resilient manner by second releasable fixing means.
Type:
Grant
Filed:
June 5, 2002
Date of Patent:
January 20, 2004
Assignee:
Snecma Moteurs
Inventors:
Eric Conete, Alexandre Forestier, Didier Hernandez
Abstract: The stator shroud is made up of components (2) juxtaposed so as to form circumferences, which are successive and assembled separately to a common housing which surrounds them. Characteristically, the assembly is made with only one single fixing point (7) per component (2), while being completed by a support point (21) sliding along the circumference. The result is a more flexible component assembly and a more even distortion, which allows better control of the clearances between the shroud and the rotor blades it surrounds.
Type:
Grant
Filed:
November 27, 2001
Date of Patent:
January 20, 2004
Assignee:
SNECMA Moteurs
Inventors:
Pierre Emmanuel Etienne Debeneix, Philippe Roger Fernand Guerout, Olivier Louis Fernand Huppe, Gilles Gérard Claude Lepretre, Olivier Jean-Jacques Louaisil, Thierry Jean-Maurice Niclot
Abstract: A turbomachine has inner and outer annular shells of metal material containing, in a gas flow direction F, a fuel injector assembly, a composite material annular combustion chamber, and an nozzle of metal material forming the fixed-blade inlet stage of a high pressure turbine. Provision is made for the combustion chamber to be held in position between the inner and outer metal annular shells by a plurality of flexible metal tabs having first ends interconnected by a flange-forming metal ring fixed securely to each of the annular shells by first fixing means, and second ends fixed by second fixing means firstly to the composite material combustion chamber and secondly to one end of a composite material wall whose other end forms a bearing plane for a sealing element secured to the nozzle and providing sealing for the gas stream between the combustion chamber and the nozzle.
Type:
Grant
Filed:
June 5, 2002
Date of Patent:
January 13, 2004
Assignee:
SNECMA Moteurs
Inventors:
Gwénaëlle Calvez, Eric Conete, Alexandre Forestier, Didier Hernandez
Abstract: A part is used that constitutes a platform web and that has a shape close to the shape of the platform with an inside face and an outside face that are opposite each other. Fiber reinforcement plies are draped on a blade core and at least some of these plies extend beyond an end of the blade that is to be connected to the platform so as to form ply extensions. The ply extensions are folded down against the inside and outside faces of the platform to form flaps securing the blade to the platform, and fiber reinforcement plies are draped around the platform web and over the flaps so as to form a platform box retaining the flaps.
Type:
Grant
Filed:
November 27, 2001
Date of Patent:
January 13, 2004
Assignee:
SNECMA Moteurs
Inventors:
François Marlin, Cyrille Mathias, François Ribassin
Abstract: A turbomachine stator flap including a structural beam which is formed integrally with a structural core for a vane, and fastening portions, and a composite envelope surrounding the structural core and forming at least the aerodynamic profile of the vane.
Type:
Grant
Filed:
December 10, 2001
Date of Patent:
January 13, 2004
Assignee:
SNECMA Moteurs
Inventors:
Claude-Gaston Corbin, Jean-Marie Le Francois, Cyrille Mathias
Abstract: An emergency device for relighting a windmilling turbojet, the jet comprising a fan driven by a low-pressure turbine via a first shaft and a compressor driven by a high-pressure turbine via a second shaft disposed coaxially around the first shaft, a differential interconnecting said first and second shafts while compensating for their different speeds of rotation in normal operation or the turbojet, and a braking system connected to the differential so as to enable it to be slowed down or blocked when the turbojet shuts down, thereby enabling the first shaft to entrain the second shaft so that it reaches a speed that favors relighting of the turbojet.
Abstract: The reactive element is introduced to the surface of the metal substrate in the form of an oxide powder and the aluminide-type coating is then formed.
Abstract: Stationary sensors are used to measure periodically the vibratory motions of portions of a body spinning in front of them, such as blades, and to try to determine their natural frequencies by spectral analyses. The sensors are collected together in several networks of different numbers and the determination includes a comparison of the spectra of the different networks via different operations of selection and rejection of lines. The process appreciably pushes back the limit of unambiguous frequency detection.
Type:
Grant
Filed:
December 12, 2001
Date of Patent:
December 30, 2003
Assignee:
Snecma Moteurs
Inventors:
Pierre Jean Emile Beausseroy, Jean-louis Eyraud, Régis Léo Marie Jean Lengelle
Abstract: In a turbomachine comprising inner and outer annular shells of metal material containing, in a gas flow direction F: a fuel injection assembly; an annular combustion chamber of composite material having a plurality of air feed orifices in a primary zone and/or in a dilution zone; and an annular nozzle of metal material forming the inlet stage with fixed blades for a high pressure turbine, provision is made for the combustion chamber to be held in position between the inner and outer annular metal shells by means of a plurality of flexible metal tongues having first ends interconnected by respective metal rings fixed securely to said inner and outer annular shells by first fixing means, and second ends fixed securely to the composite material combustion chamber at it air feed orifices by second fixing means.
Abstract: An arrangement for adjusting the diameter of a gas turbine stator includes a casing having a main portion and rings bordering a vein of a gas flow and located in front of respective levels of mobile blades of a rotor, and communication passages of a gas flow under pressure. The rings are surrounded by the casing and fixed thereto by circular groups of spacers. The rings include a wall extending from the casing to one of the rings and separating two chambers. The wall includes an outside edge curved into a spacer hook and engaged between the main portion of the casing and a respective appendage curved into a casing hook associated with the spacer hook. The communication passages of the gas flow under pressure exist between the chambers. At least one of the communication passages is realized by cavities through a junction of hooks.
Abstract: A fuel injection system in a turbomachine, the system comprising a high pressure pump for pressurizing the fuel coming from a fuel tank to a high pressure P1, a plurality of fuel injectors disposed in a combustion chamber of the turbomachine, and a metering unit interposed between said high pressure pump and said plurality of injectors to control the rate at which fuel flows into the injectors from the high pressure pump, wherein said metering unit comprises a pressurization valve piloted to occupy two pressure levels by means of a metering valve fed with fuel from said high pressure pump. A solenoid stop valve for acting on the pressurization valve is also provided to interrupt the feed of fuel to the injectors.
Type:
Grant
Filed:
December 10, 2001
Date of Patent:
December 23, 2003
Assignee:
SNECMA Moteurs
Inventors:
Claude Maillard, David Maillard, Alain Garassino
Abstract: The tank for storing gas at high pressure, such as a tank for a vehicle running on gas, comprises a confinement volume accessible via coupling means and defined by a duct disposed in a spiral coil so that the substantially rectilinear main portions of the duct bear against one another. The forces exerted by the pressure of the gas on the main portions of a turn of the duct are then compensated by the forces exerted on the adjacent turns of the duct.
Abstract: The invention relates to a device for ventilating a high pressure turbine rotor which comprises a turbine disk and an upstream end plate. A first circuit for cooling blades delivers a first air flow via main injectors and holes formed in the end plate. A second cooling circuit delivers a second air flow through a discharge baffle situated downstream from the compressor, a fraction of this second flow serving to cool the upstream top face of the end plate through a second baffle situated beneath the main injectors. A branch connection is provided between the first circuit and the enclosure situated downstream from the second baffle and it delivers a third flow which is set into pre-rotation by additional injector means formed in the form of inclined bores.
Type:
Application
Filed:
May 27, 2003
Publication date:
December 4, 2003
Applicant:
SNECMA MOTEURS
Inventors:
Sylvie Coulon, Gerard Stangalini, Jean-Claude Taillant, Gerard Adam
Abstract: An annular combustion chamber has outer and inner axially-extending side walls of composite material and an end wall of metal material held in position on the outer and inner side walls by fixing means. Provision is made for the fixing means to pass through annular cavities that are designed to receive cylindrical end portions of the outer and inner side walls, and that are created between peripheral edges of the end wall and facing portions folded downstream, a determined amount of clearance J being provided between the peripheral edges and the facing faces of the outer and inner side walls in such a manner as to allow expansion to take place freely, in operation, in a radial direction between said end wall and said side walls.
Abstract: A spacer (36) made to be installed between two permanently connected discs (31 and 32), without a bolted flange, and comprising axial thrust (43, 47) as well as outer radial thrust (45, 48) alignment surfaces (41). It comprises moreover an outer cover (37) to provide sealing and a cooling passageway, and stiffening tongues (38) which accommodate thrust loads.
Type:
Grant
Filed:
June 3, 2002
Date of Patent:
December 2, 2003
Assignee:
SNECMA Moteurs
Inventors:
Bruno Beutin, Michel Brault, Pascal Gervais, Elisabeth Guigli, Monique Thore