Classifications

• • 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
  • F02C7/24—Heat or noise insulation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B64—AIRCRAFT; AVIATION; COSMONAUTICS
  • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
  • B64D29/00—Power-plant nacelles, fairings, or cowlings
• • 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
  • F01D25/08—Cooling; Heating; Heat-insulation
  • F01D25/12—Cooling
• • 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
  • F02K1/54—Nozzles having means for reversing jet thrust
  • F02K1/64—Reversing fan flow
• • 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
  • F05D2300/00—Materials; Properties thereof
  • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
  • F05D2300/603—Composites; e.g. fibre-reinforced
• • 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
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/6851—With casing, support, protector or static constructional installations
  • Y10T137/7036—Jacketed

Definitions

• the present invention relates to a cooling assembly for a component of a nacelle for turbojet engine, said assembly comprising at least one composite wall separating a cold zone and a hot zone comprising said component.
• the modern nacelles are intended to house a turbojet engine capable of generating, on the one hand, a hot air flow, also called “primary flow”, from the combustion chamber of the turbojet engine, and circulating in a space delimited by a substantially tubular compartment called “core compartment”, and secondly, a cold air flow, also called “secondary flow”, from the fan and circulating outside the turbojet through an annular passage, also called “vein”, formed between an internal structure defining a fairing of the turbojet engine and the outer structure of the nacelle protecting the nacelle from the outside.
• the two air flows are ejected from the turbojet engine from the rear of the nacelle.
• Part of the walls of the nacelle separates a first zone called “cold zone” and a second zone called “hot zone", said cold zone being colder than said hot zone.
• Some components in the hot zone may be damaged by the thermal stress caused by the difference in temperature between the hot zone and the cold zone. In particular, this is the case for components such as damping and stopping devices, for example "bumper", placed in the core compartment of the nacelle on the wall of the fixed internal structure of the reversing device. thrust.
• the use of dropping allows to imitate the displacements of the elements forming the fixed internal structure of the thrust reverser.
• the cold air pressure present in the cold zone is not always sufficient to cool the components.
• the components are then protected by a thermal envelope consisting of two strips of stainless steel and an insulating material.
• the cooling can be enhanced by conduction, when the wall is made of a heat conductive material, such as aluminum.
• the present invention also allows a gain in mass of the nacelle since it is possible to use walls of composite material.
• the assembly of the invention comprises one or more of the following optional characteristics considered alone or according to all the possible combinations:
• the interface element is made of aluminum or any other material having a thermal conductivity at least equivalent to that of aluminum;
• At least one wedge is interposed between the ends of the interface element and the composite wall;
• the interface element is coated with an envelope made of a thermal conductive material;
• the thermal conductive material is chosen from aluminum or any other material having a thermal conductivity at least equivalent to that of aluminum.
• the composite wall of said assembly is the wall of a fixed internal structure of thrust reverser.
• the interface element forms the support of a damping and stopping device fixed on the wall of the fixed internal structure, said device being intended to be mounted in the hot zone.
• FIG. 1 is a longitudinal section of an embodiment of a nacelle of the invention
• FIG. 2 is a simplified cross-section of the nacelle of FIG. 1;
• FIG. 3 is a front perspective view of an embodiment of a cooling assembly comprising a composite wall of the fixed internal structure of a nacelle and an interface element in the form of a support of a damping and stopping device mounted on said wall;
• FIG. 4 is a rear perspective view of the wall and of the damping and stopping device of FIG. 3;
• Figure 5 is a cross-section of the embodiment of the cooling assembly of Figure 3;
• FIG. 6 is a cross-section of a variant of FIG.
• a nacelle 1 As represented in FIG. 1, a nacelle 1 according to the invention comprises an air inlet lip 2, a median structure 3 surrounding a fan 4 of a turbojet engine 5 and a downstream assembly 6.
• the downstream assembly 6 comprises a fixed internal structure 7 (IFS) surrounding the upstream part of the turbojet engine 5, an external fixed structure (OFS) 9 and a movable cowl (not shown) having thrust reversal means.
• IFS fixed internal structure 7
• OFS external fixed structure
• the I FS 7 and the FSO 9 delimit a vein 8 allowing the passage of a cold air stream penetrating the nacelle 1 of the invention at the level of the air inlet lip 2.
• the vein 8 corresponds to a cold zone.
• the temperature inside the vein 8 is between -50 ° C and 100 ° C.
• a suspension pylon (not shown in FIG. 1) supports the turbojet engine 5 and the nacelle 1 of the invention.
• the nacelle 1 of the invention ends with an ejection nozzle 10 comprising an external module 12 and an internal module 14.
• the inner and outer modules 14 and 14 define a primary air flow flow channel
• the core compartment 16 is defined as a hot zone comprising the turbojet engine 5 generating the circulation of the primary hot air flow and the flow channel of the said primary air stream 15.
• the temperature inside the core compartment 16 is typically between 100 ° C and
• Said core compartment 16 is surrounded by
• the IFS 7 is formed of a wall of composite material, in particular in the form of at least one panel.
• the wall of the IFS 7 thus separates a cold zone, the vein 8 in which circulates a flow of cold air, and a hot zone, the core compartment 16.
• the panel can be of the sandwich type in bee n id ( NI DA) taken between two composite layers possibly pierced acoustically cold side side, namely the vein 8.
• the composite material may be selected from a material comprising a mixture of carbon and epoxy or carbon and BMI or other composite.
• the IFS 7 can be made in a multitude of articulated structures to each other, in particular in two fixed internal half-structures articulated in the 12-2 position when the nacelle 1 of the invention is seen from face, namely at the attachment mast 21 of the nacelle and locked in the 6 o'clock position when the nacelle 1 of the invention is seen face, ie diametrically opposed to the location of said mast 21.
• the wall 20 of each half-structure thus separates a cold zone 8 from a hot zone 16.
• the IFS 7 typically comprises at least one damping and stopping device 23, also known as a "bumper", which makes it possible to limit the displacement of the two fixed internal half-structures, in particular the walls 20.
• damping and stopping device 23 also known as a "bumper”
• a plurality of damping and stopping devices 23 can be installed in the 6 o'clock position and in the 12 o'clock position, in particular three in the 6 o'clock position and three in the 12 o'clock position.
• each damping and stopping device 23 comprises a head 25 configured to abut another abutment mounted on the wall 20 of one of the two internal half-structures.
• the head 25 is mounted on a support 27 fixed on said wall 20 of the internal half-structure.
• the cooling assembly 30 of the invention comprises at least one composite wall 20 in which at least one opening 31 is formed, and a thermal conducting interface element 33 which is arranged on the wall in order to obstruct said opening 31, said thermal conductive element 33 being associated with the component to be cooled, in this case with the device 23.
• the component can also be any nacelle and / or engine equipment installed in a hot zone near a cold zone.
• the cold zone 8 is typically colder than the hot zone 16. In other words, the average temperature of the cold zone 8 is lower than the average temperature of the hot zone 16.
• the present invention thus makes it possible in a simple and effective manner to cool a component 23 disposed in an area ch aud e 1 6, icile compartment core, associated with a thermal conductive element 33 which allows a heat exchange for closing one or more openings 31 present in the composite wall 20.
• the present invention also allows a gain in mass of the nacelle 1 of the invention since it is possible to use composite walls for cooling components.
• the interface element 33 may be attached to said component 3 or be formed of material with the latter.
• the interface element 33 can form the support 27 which is configured to obstruct said aperture (s) 31.
• the assembly 30 of the invention comprises a single opening 31. It is possible that said assembly 30 comprises a plurality of openings 31.
• the opening or openings 31 may have any shape and have any size.
• the interface element 33 can obstruct a single opening 31 of dimension substantially equal to or slightly smaller than that of the interface element 33 (see FIG. 5).
• the interface element can also obstruct a plurality of openings of dimension much smaller than that of the interface element.
• the interface element 33 may have an aerodynamic continuity shape of the remainder of the composite wall 20.
• the flow of air flowing in the cold zone 8 is not disturbed by the presence of the interface element 33.
• the interface element 33 may be made of a thermally conductive material selected from aluminum or any other material having a thermal conductivity at least equivalent to that of aluminum.
• the interface element 33 may comprise ends configured 41 to be fixed on the composite wall 20 of each fixed half-structure by fixing means.
• the ends 41 may have a shape substantially complementary to the surface of the composite wall 20 on which said ends 41 are intended to be fixed.
• the fixing means may be permanent type, targeted or blind and include countersunk heads, including a dozen countersunk heads.
• At least one shim 43 is interposed between the ends 41 of the interface element and the composite wall 20.
• the presence of the wedge 43 can absorb any aerodynamic defect.
• the wedge 43 may be made of aluminum, titanium or steel and a peelable, mixed or solid process.
• the interface element 33 may be protected by a casing made of a thermal conductive material of the stainless steel casing type. Therefore, it avoids too high temperature rise within the interface element 33, which allows to regulate the heat in the latter more easily.
• the thermal conductive material may be cho isi among aluminum or any other material having a thermal conductivity at least equivalent to that of aluminum.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Aviation & Aerospace Engineering (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Wind Motors (AREA)

Applications Claiming Priority (2)

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• 2010
  • 2010-03-03 FR FR1051525A patent/FR2957053B1/fr active Active
• 2011
  • 2011-02-03 CN CN201180006156.5A patent/CN102713205B/zh not_active Expired - Fee Related
  • 2011-02-03 CA CA2786542A patent/CA2786542A1/fr not_active Abandoned
  • 2011-02-03 US US13/579,549 patent/US20120318380A1/en not_active Abandoned
  • 2011-02-03 WO PCT/FR2011/050214 patent/WO2011107682A2/fr active Application Filing
  • 2011-02-03 BR BR112012018614A patent/BR112012018614A2/pt not_active IP Right Cessation
  • 2011-02-03 EP EP11707454A patent/EP2542471A2/fr not_active Withdrawn
  • 2011-02-03 RU RU2012141289/11A patent/RU2552574C2/ru not_active IP Right Cessation

Non-Patent Citations (1)

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