Snecma

Snecma Moteurs

Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Aubert & Duval

Snecma Services

Safran Aircraft Engines

Claude Marcel Mons

Isabelle Peslerbe

Jean-Luc Soupizon

Stephane Rousselin

Philippe Heritier

Jacques Montagnon

Joël Olivier Alfred Abel Vigneau

Jacques Rene Bart

Laurent Ferrer

Didier Rene Andre Escure

Philippe Pabion

Christelle Foucher

Jean-Marc Rongvaux

Yann Pascal Raymond Rene Lebret

Francois Pierre Georges Maurice Ribassin

Laurent Raberin

Roland R Spinat

G&eacute;rard Michel Roland Gueldry

Thierry Thomas

Frédéric Braillard

Bruno Dambrine

Didier René André Escure

V&eacute;ronique Christiane Raymonde Giffard

Catherine Dominique B&eacute;atrice Duquenne

Agathe Venard

Michel M Ruimi

Sebastien Alain Imbourg

Stéphane Rousselin

Vincent Dessoly

Annie Pasquet

Jacques René Bart

Philippe Perruchaut

Philippe Le Biez

Sébastien Imbourg

Yann Lebret

Michel Jean-Pierre Pernot

Jacques P Tirole

Philippe Gallois

Blandine Barbier

Manuel Girard

Pascal Vignolles

Sandra Andrieu

Didier Ribot

Sebastien Bourget

Serge De Sanctis

Vincenzo Bertoli

Ana Carmen Viguera Sancho

Stephane Rene Julien Giusti

Aymeric Hugonie

Philippe Charles Lebiez

Pierre Etienne Mosser

Alain Louis Chevrollier

Michel Paul Lucien Vernet

G&eacute;rard Gueldry

Marie-Christine Ntsama-Etoundi

Gérard Michel Roland Gueldry

Benoit Jean Henri Berthelet

Joël Vigneau

Joel Vigneau

Jacques Bernard

Jean-Iuc Soupizon

Sébastien Bourget

Veronique Christiane Giffard

Yann Pascal Raymond Lebret

Alain Perroux

Stéphane René Julien Giusti

Ana Viguera Sancho

Benoit Jean Berthelet

Stephane Rene Giusti

Didier Rene Escure

Yannick Cadoret

Samuel Hervier

A method for manufacture of a compressor housing which is resistant to a titanium fire (burning titanium). A circular blank made of steel, or steel alloy, or superalloy which is incombustible in the presence of a titanium fire is hydroformed against a circular blank made from titanium or titanium alloy.

Method for the manufacture of a circular revolution thermomechanical part including a titanium-based load-bearing substrate lined with steel or superalloy, a turbomachine compressor housing which is resistant to titanium fire obtained according to this method

A method for increasing the coefficient of adhesion between two parts that rotate as one with a rotor, for example a turbomachine rotor, those parts pressing against one another via pressing faces. The method includes milling at least one of the pressing faces so as to modify its surface finish and increase its roughness, then covering the or each machined face with a thin layer of a material that is hard and has a high coefficient of friction.

Method for increasing the coefficient of adhesion between two parts rotating as one with a rotor

A method for repairing a compressor blade of a turbine engine, the blade including a cat's tongue at the radial end thereof, the radial extension of which is less than a predefined nominal radial extension. The method includes elongating the cat's tongue via a cold-compacting operation applied to the walls of said tongue, such that the radial elongation thereof becomes greater than the nominal extension. The compacting operation is a rollerburnishing operation carried out by moving the end of the blade between two rollers having rectilinear generatrices and spaced apart by a distance smaller than the thickness of the cat's tongue, along the chord connecting the leading edge with the trailing edge thereof.

Repairing titanium compressor blades by cold compacting

A compressor housing resistant to a titanium fire (burning titanium). A mixed housing is constructed, in which a structure holding stator blades includes a single-cast part made from titanium or titanium alloy, and at least one element forming a shield made from refractory alloy(s), and which is incombustible in presence of burning titanium, where each shield is secured to the single-cast part by fasteners. The fasteners are positioned with each shield so as to define jointly an inner wall demarcating an outer contour of the compressor airstream.

Compressor housing resistant to titanium fire, high-pressure compressor including such a housing and aircraft engine fitted with such a compressor

A method for producing, on the surface of a wall capable of being swept by a fluid, raised elements forming disruptions of the boundary layer is disclosed. The method includes applying laser shocks to the surface so as to create peaks on the edge of the impact zones such that the peaks form the disruptive raised elements.

Method of using laser shock impacts to produce raised elements on a wall surface capable of being swept by a fluid in order to control the intensity of turbulence in a transition zone

A wall-cooling device for cooling a wall subjected to a heat source and to an outer fluid. The device includes a cooling part with a fastening portion and a cooling portion. The cooling part is made of a thermally-conductive shape-memory alloy having a transition temperature T. The fastener portion is for fastening the device rigidly on a face of the wall. The cooling portion is shaped so that it takes up a first position that is substantially parallel to the wall when the temperature of the wall is lower than the temperature T and so that it takes up a second position in which a plane of the second portion defines, relative to a plane tangential to the wall, a dihedral angle lying in the range 45&#xb0; to 90&#xb0; .

Wall cooling device

An actuating device for opening and closing at least one shutter in a gas turbine engine, such as a turbojet engine, includes at least one actuator made of a two-way shape memory alloy having a first stable state at a first temperature in which state it actuates either the opening or the closing of the shutter, and a second stable state at a second temperature, in which state it actuates either the closing or the opening of the shutter, respectively.

Actuating device, bypass air bleed system equipped therewith, and turbojet engine comprising these

The de-icing system comprises a flexible bladder () filled with de-icing fluid, pressed by the centrifugal forces produced when the rotor tip () is rotating against the inner wall thereof to apply a pressure favoring the progressive and calibrated discharge of the fluid, in the absence of a pump and any other active means. For this, the bladder comprises a concavity () at the rear which is automatically enlarged under the effect of centrifugal forces during operation and discharges the fluid continuously from the bladder.

Turbo-engine compressor tip comprising de-icing means

A device for centering a tube inside a hollow shaft is disclosed. The device includes a deformable device interposed between the tube and the hollow shaft and including bearing members for bearing against the inside surface of the shaft and suitable for being spaced away from the inside surface of the shaft in order to enable them to be moved inside the shaft. The deformable device is made of a shape-memory material suitable for deforming to press the bearing members against the inside surface of the shaft or to space them away therefrom on being subjected to a predetermined temperature.

Centering a part inside a shaft

The invention relates to steel which is characterized by the following composition as expressed in percentages by weight: &#x2014;C=0.18 0.30%, &#x2014;Co=5-7%, &#x2014;Cr=2-5%, &#x2014;Al=1-2%, &#x2014;Mo+W/2=1-4%, &#x2014;V=trace 0.3%, &#x2014;Nb=trace 0.1%, &#x2014;B=trace&#x2212;50 ppm, &#x2014;Ni=10.5-15% with Ni&#x2267;7+3.5 Al, &#x2014;Si=trace 0.4%, &#x2014;Mn=trace 0.4%, &#x2014;Ca=trace&#x2212;500 ppm, &#x2014;Rare earths=trace&#x2212;500 ppm, &#x2014;Ti=trace&#x2212;500 ppm, &#x2014;O=trace&#x2212;200 ppm if the steel is obtained by means of powder metallurgy or trace&#x2212;50 ppm if the steel is produced in air or under a vacuum from molten metal, &#x2014;N=trace&#x2212;100 ppm, &#x2014;S=trace&#x2212;50 ppm, &#x2014;Cu=trace&#x2212;1%, and &#x2014;P=trace&#x2212;200 ppm, the remainder including iron and the inevitable impurities resulting from production. The invention also relates to a method of producing a part from said steel and to the part thus obtained.

Hardened martensitic steel, method for producing a component from this steel and component obtained in this manner

A device for, in a gas turbine engine, braking a turbine including a rotor driving a shaft capable of rotating with respect to a stator in the event of said shaft breaking is disclosed. The device includes a first braking member provided with at least one abrasive element and a second braking member including a ring-shaped element (A) made of a material capable of being eroded by the abrasive element. One of the two braking members being secured to the rotor and the other of the two braking members being secured to the stator. The braking members come into contact with one another through axial displacement of the rotor once the shaft has broken. The abrasive element of the first braking member eroding the ring-shaped element of the second braking member.

System providing braking in a gas turbine engine in the event of the turbine shaft breaking

The invention relates to steel which is characterized by the following composition as expressed in percentages by weight:&#x2014;C=0.18 0.30%, &#x2014;Co=5-7%, &#x2014;Cr=2-5%, &#x2014;Al=1-2%, &#x2014;Mo+W/2=1-4%, &#x2014;V=trace 0.3%, &#x2014;Nb=trace 0.1%, &#x2014;B=trace&#x2212;50 ppm, &#x2014;Ni=10.5-15% with Ni&#x2267;7+3.5 Al, &#x2014;Si=trace 0.4%, &#x2014;Mn=trace 0.4%, &#x2014;Ca=trace&#x2212;500 ppm, &#x2014;Rare earths=trace&#x2212;500 ppm, &#x2014;Ti=trace&#x2212;500 ppm, &#x2014;O=trace&#x2212;200 ppm if the steel is obtained by means of powder metallurgy or trace&#x2212;50 ppm if the steel is produced in air or under a vacuum from molten metal, &#x2014;N=trace&#x2212;100 ppm, &#x2014;S=trace&#x2212;50 ppm, &#x2014;Cu=trace&#x2212;1%, and &#x2014;P=trace&#x2212;200 ppm, the remainder comprising iron and the inevitable impurities resulting from production. The invention also relates to a method of producing a part from said steel and to the part thus obtained.

The invention relates to steel which is characterized by the following composition as expressed in percentages by weight: &#x2014;C=0.18 0.30%, &#x2014;Co=5-7%, &#x2014;Cr=2-5%, &#x2014;Al=1-2%, &#x2014;Mo+W/2=1-4%, &#x2014;V=trace 0.3%, &#x2014;Nb=trace 0.1%, &#x2014;B=trace&#x2014;50 ppm, &#x2014;Ni=10.5-15% with Ni&#x2267;7+3.5 Al, &#x2014;Si=trace 0.4%, &#x2014;Mn=trace 0.4%, &#x2014;Ca=trace&#x2014;500 ppm, &#x2014;Rare earths=trace&#x2014;500 ppm, &#x2014;Ti=trace&#x2014;500 ppm, &#x2014;O=Trace&#x2014;200 ppm if the steel is obtained by means of powder metallurgy or trace&#x2014;50 ppm if the steel is produced in air or under a vacuum from molten metal, &#x2014;N=trace&#x2014;100 ppm, &#x2014;S=trace&#x2014;50 ppm, &#x2014;Cu=trace&#x2014;1%, and &#x2014;P=trace&#x2014;200 ppm, the remainder including iron and the inevitable impurities resulting from production. The invention also relates to a method of producing a part from said steel and to the part thus obtained.

A support for a bearing that guides a shaft in a turbomachine is disclosed. The support includes an annular part made of a shape memory material which retains an initial shape when the load applied to it remains below a threshold value and which deforms, absorbing energy when the applied load becomes at least equal to the threshold value. The annular part is capable of reverting at least approximately to its initial shape when the applied load drops back below the threshold value.

Turbomachine shaft guidance

Growing community of inventors

Savigny-Le-Temple, France

Claude Marcel Mons