EP1840469A1 - Nachbrennerarm einer Nachbrennkammer - Google Patents

Nachbrennerarm einer Nachbrennkammer Download PDF

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Publication number
EP1840469A1
EP1840469A1 EP07290288A EP07290288A EP1840469A1 EP 1840469 A1 EP1840469 A1 EP 1840469A1 EP 07290288 A EP07290288 A EP 07290288A EP 07290288 A EP07290288 A EP 07290288A EP 1840469 A1 EP1840469 A1 EP 1840469A1
Authority
EP
European Patent Office
Prior art keywords
arm
finger
box
orifice
ventilation box
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
EP07290288A
Other languages
English (en)
French (fr)
Other versions
EP1840469B1 (de
Inventor
Jacques Marcel Bunel
Nicolas Pierre-Marie Girard
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
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 SNECMA SAS filed Critical SNECMA SAS
Publication of EP1840469A1 publication Critical patent/EP1840469A1/de
Application granted granted Critical
Publication of EP1840469B1 publication Critical patent/EP1840469B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/16—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration with devices inside the flame tube or the combustion chamber to influence the air or gas flow
    • F23R3/18—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants
    • F23R3/20—Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants incorporating fuel injection means

Definitions

  • the present invention relates to a flame-holder arm of an afterburner chamber in a turbomachine such as a turbojet engine.
  • an afterburner comprises a series of flame-holder arms which are each formed of a hollow dihedron whose crown edge is oriented upstream of the chamber and which is closed on the downstream side by a thermal protection screen.
  • a fuel rail extends radially inside the arm from an outer casing of the chamber. This ramp is connected to fuel supply means and has fuel spray holes.
  • a ventilation box extends in the arm substantially parallel to the ramp, between the latter and the edge of the dihedral arm, and has at its radially outer end a cooling air intake opening for distribution in the arm through holes in the box.
  • the radially inner end of the ventilation box is closed and comprises a centering finger engaged in an orifice of the arm.
  • the ventilation box also comprises, in the vicinity of its radially inner end, a lug protruding downstream and whose free end is engaged in a corresponding orifice of the thermal protection screen to maintain the ventilation box .
  • An orifice formed in the lug receives the lower end of the fuel rail to center it in the arm.
  • the arm is assembled with the ventilation box and the thermal protection screen which is fixed on the arm by means of welded and welded pins and which immobilizes the ventilation box.
  • the fuel rail is mounted in the arm from the outer casing of the chamber, by engagement of its radially inner end between the thermal protection screen and the ventilation box, until this end is housed in the centering hole formed in the lug of the box.
  • the ventilation box is subjected to significant vibrations that cause frictional wear of its lug and the corresponding orifice of the thermal protection screen, which results in a displacement of the box inwards, and by exceeding the box finger in the primary flow, and wear and enlargement of the orifice of the arm which receives the centering pin of the box.
  • Moving the vent box inward may cause the fuel rail to disengage from the pin hole and rupture the boom.
  • the invention aims in particular to provide a simple, effective and economical solution to all of these problems.
  • a flame-holder arm of an afterburner chamber comprising an open dihedral shaped body, a ventilation box extending inside the body and having at one end a centering finger engaged in an orifice of the body, a fuel rail extending inside the body along the ventilation box, means for guiding and centering the ramp relative to the box, and a thermal protection screen fixed on the body and closing the open face of the dihedron, characterized in that the ventilation box comprises immobilization means in the body of the arm which are independent of the thermal protection screen.
  • the centering pin of the box passes through the orifice formed in the body of the arm and comprises the means for immobilizing the box on the body of the arm.
  • these immobilizing means comprise an annular shoulder formed on the centering finger and intended to bear on the edge of the orifice of the body of the arm, inside the arm.
  • the shoulder of the centering finger is applied to the body of the arm by the annular piece which is attached to the end of this finger, outside the arm.
  • this annular piece comprises at least one flat cooperating abutting with a corresponding element of the body of the arm to participate in the immobilization in rotation of the box relative to the arm.
  • the box of ventilation also includes a transverse flange which has a centering hole of the fuel rail and which occupies almost all the available space inside the arm, to prevent improper assembly of the fuel rail.
  • the blind assembly of the fuel rail in the body of the arm can not result in an incorrect arrangement of the fuel rail and avoids the risk of wear and degradation of the ramp and the body of the arm.
  • the invention also proposes a ventilation box for a flame holder arm, comprising an open end and an end formed with a substantially axial finger, characterized in that this finger has an annular support shoulder on a support.
  • This ventilation box is further characterized in that it is formed with a transverse flange having a through hole whose axis is substantially parallel to the longitudinal axis of the box.
  • the invention also relates to a turbomachine, such as an aircraft turbojet engine, characterized in that it comprises at least one flame-holder arm of the type described in the foregoing.
  • a flame holder arm 10 of known technique is mounted on a casing 12 of an afterburner chamber of a turbojet engine, at its radially outer end, this arm 10 extending substantially radially in the post-combustion chamber and passing through a confluence sheet 14 which separates the primary stream 16 of the hot combustion gases from the secondary stream 18 provided by a fan mounted at the front of the turbojet engine.
  • the flame holder arm 10 comprises a body 20 in the form of an open dihedron, whose apex edge 22 is oriented upstream and whose opening is turned downstream and in which are arranged a ventilation box 24, a fuel rail 26 and a thermal protection screen 28 having a section C and which closes the open face of the body 22.
  • the ventilation box 24 extends inside the arm along the crown edge 22 and comprises a radially outer end which is open and is supplied with air from the secondary flow 18 through an opening in the radially outer portion of the body of the arm.
  • the radially inner portion of the box 24 comprises multiple perforations of air distribution inside the arm.
  • the radially inner end of the casing forms a cylindrical finger 30 which is engaged without play in an orifice of the base 32 of the body of the arm, the end of the finger 30 coming flush with the outer face of this base 32 without protruding from the outside the arm.
  • the housing of ventilation 24 comprises a tab 34 which extends downstream in the direction of the heat shield 28, substantially perpendicular to the longitudinal axis of the box 24, and whose free end forms a lug 36 engaged in a corresponding orifice of the screen 28.
  • This tab 34 also comprises, in an intermediate portion between the ventilation box 24 and the lug 36, a through hole for receiving the lower part of the fuel rail 26 for centering this ramp inside the arm 10 .
  • the ventilation box 24 is first disposed in the body 20 of the arm 10, then the thermal protection screen 28 is put in place, the lug 36 of the ventilation box being engaged in the opening of the housing. screen, then the screen 28 is fixed by welding at four points 34 on the side walls of the body 20 of the arm, thus fixing the ventilation box 24 inside the arm.
  • the fuel rail 26 is then blindly mounted inside the arm from the radially outer end thereof. This operation requires particular care because the lower end of the fuel rail 26 must be engaged in the hole provided in the lug 34 of the ventilation box 24 and not between this lug 34 and a side wall of the body 20 of the arm 10.
  • the ventilation box 24 is subjected to radial vibrations inside the arm 10, which results in wear of its lug 36 and the edges of the corresponding orifice of the heat shield 28 as well as by a wear of the finger 30 of its radially inner end and the edges of the corresponding orifice formed in the base 32 of the arm 10.
  • this displacement of the ventilation box 24 in the arm 10 may allow the radially inner end of the fuel rail 26 to disengage from its guide orifice formed in the lug 34 of the housing. ventilation, which causes the rupture of the fuel rail 26.
  • the invention proposes that the ventilation box 24 be mounted and fixed inside the arm 10 independently of the thermal protection screen 28, as has been shown in FIGS. 4 to 6.
  • the radially inner end of the ventilation box 24 comprises a cylindrical finger 40 which extends in the axis of the box 24 and which has an annular shoulder 42 forming a bearing surface on the edge of the orifice 44 formed in the base 32 of the arm 10, the cylindrical finger 40 extending outside this orifice and carrying an annular piece 46, such as a washer for example, which is fixed, for example by welding or brazing, on the end of the finger 40.
  • the orifice 44 is formed in the bottom wall 48 of a small recess 49 of the base 32 of the arm 10, this bottom wall 48 being perpendicular to the axis of the box 24 and the finger 40.
  • this recess 48 is not cylindrical, as shown schematically in Figure 6, can be given to the annular piece 46 a corresponding shape for this annular piece has a function of anti-rotation of the finger 40 and therefore the box 24 around their longitudinal axis.
  • One or two flats may also be formed in the contour of the annular piece 46, this flats or flats corresponding to planar faces of the recess 48 to give this anti-rotation function to the annular piece 46.
  • the ventilation box 24 no longer includes the lug 36 engaged in an orifice of the heat shield 28 and the lug 34 shown in FIG. 1 is replaced by a transverse flange. 50 of the box 24, this flange 50 being in the form of angular sector and extending inside the body 20 of the arm 10 so as to occupy, in a transverse plane, most of the space available inside. arm 10 between the box 24 and the screen of thermal protection 28.
  • the sides 52 and 54 of the flange 50 are approximately parallel to the side walls of the arm 10 and the screen 28 respectively, and extend a short distance from these walls, prohibiting a mounting of the radially internal end of the fuel rail 26 other than in the guide hole 56 formed in the flange 50. It thus greatly facilitates the blind assembly of the fuel rail 26 in the arm 10 and avoids any incorrect arrangement of the fuel rail, ensuring better cooling of the arm 10 by the fuel and extending the service life of the arm.
  • the ventilation box 24 In case of burning of the thermal protection screen 28, the ventilation box 24 remains in the arm 10 and continues to perform its function of cooling the various elements of the arm.
  • the fuel rail 26 is also held in place on the ventilation box 24 inside the arm and can not break.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fireproofing Substances (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP07290288.5A 2006-03-30 2007-03-06 Nachbrennerarm einer Nachbrennkammer Active EP1840469B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0602742A FR2899316B1 (fr) 2006-03-30 2006-03-30 Bras accroche-flammes d'une chambre de post-combustion

Publications (2)

Publication Number Publication Date
EP1840469A1 true EP1840469A1 (de) 2007-10-03
EP1840469B1 EP1840469B1 (de) 2018-12-05

Family

ID=37199105

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07290288.5A Active EP1840469B1 (de) 2006-03-30 2007-03-06 Nachbrennerarm einer Nachbrennkammer

Country Status (5)

Country Link
US (1) US7856828B2 (de)
EP (1) EP1840469B1 (de)
CA (1) CA2582624C (de)
FR (1) FR2899316B1 (de)
RU (1) RU2410604C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2096357A1 (de) * 2008-02-29 2009-09-02 Snecma Flammenhalter für Nachverbrennungskanal eines Turboreaktors mit einer Abstandschwelle, sowie Nachverbrennungskanal und Turboreaktor, der einen Nachverbrennungskanal umfasst
FR3097298A1 (fr) 2019-06-12 2020-12-18 Safran Aircraft Engines Bougie intégrée au bras accroche-flamme

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2873408B1 (fr) * 2004-07-23 2008-10-17 Snecma Moteurs Sa Turboreacteur avec un ecran de protection de la rampe de carburant d'un anneau bruleur, l'anneau bruleur et l'ecran de protection
FR2950416B1 (fr) * 2009-09-23 2012-04-20 Snecma Dispositif accroche-flammes comprenant un support de bras et un ecran de protection thermique monoblocs
CN109352287B (zh) * 2018-12-06 2020-10-13 中国航发贵州黎阳航空动力有限公司 一种钣焊结构件精密孔的加工方法
CN113701191B (zh) * 2021-09-01 2022-06-24 南昌航空大学 一种交错导流中缝式v型火焰稳定器
GB2615335B (en) * 2022-02-04 2024-05-08 Rolls Royce Plc A reheat assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698186A (en) * 1970-12-24 1972-10-17 United Aircraft Corp Afterburner combustion apparatus
FR2709342A1 (fr) * 1993-08-25 1995-03-03 Snecma Dispositif de post combustion d'un turboréacteur.
US5396761A (en) * 1994-04-25 1995-03-14 General Electric Company Gas turbine engine ignition flameholder with internal impingement cooling
EP1619441A1 (de) * 2004-07-21 2006-01-25 Snecma Strahltriebwerk mit Schutzvorichtungen für einen Kraftstoffinjektor, Kraftstoffinjector und Schutzblech

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221621B1 (de) * 1973-03-13 1976-09-10 Snecma
FR2869875B1 (fr) * 2004-05-05 2006-06-16 Snecma Moteurs Sa Dispositif de fixation d'un conduit de fluide sur un carter d'un turboreacteur
FR2869953B1 (fr) * 2004-05-05 2008-07-04 Snecma Moteurs Sa Dispositif d'alimentation en air et en carburant d'un anneau-bruleur dans une chambre de postcombustion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698186A (en) * 1970-12-24 1972-10-17 United Aircraft Corp Afterburner combustion apparatus
FR2709342A1 (fr) * 1993-08-25 1995-03-03 Snecma Dispositif de post combustion d'un turboréacteur.
US5396761A (en) * 1994-04-25 1995-03-14 General Electric Company Gas turbine engine ignition flameholder with internal impingement cooling
EP1619441A1 (de) * 2004-07-21 2006-01-25 Snecma Strahltriebwerk mit Schutzvorichtungen für einen Kraftstoffinjektor, Kraftstoffinjector und Schutzblech

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2096357A1 (de) * 2008-02-29 2009-09-02 Snecma Flammenhalter für Nachverbrennungskanal eines Turboreaktors mit einer Abstandschwelle, sowie Nachverbrennungskanal und Turboreaktor, der einen Nachverbrennungskanal umfasst
FR2928202A1 (fr) * 2008-02-29 2009-09-04 Snecma Sa Accroche flamme pour canal de rechauffe d'un turboreacteur avec une semelle d'ecartement, canal de rechauffe et turboreacteur comprenant un canal de rechauffe.
US8307658B2 (en) 2008-02-29 2012-11-13 Snecma Flame holder for an afterburner duct of a jet engine with a spacer shoe, afterburner duct, and jet engine comprising an afterburner duct
FR3097298A1 (fr) 2019-06-12 2020-12-18 Safran Aircraft Engines Bougie intégrée au bras accroche-flamme

Also Published As

Publication number Publication date
US20070227151A1 (en) 2007-10-04
RU2007111676A (ru) 2008-10-10
FR2899316A1 (fr) 2007-10-05
US7856828B2 (en) 2010-12-28
CA2582624C (fr) 2015-01-13
CA2582624A1 (fr) 2007-09-30
EP1840469B1 (de) 2018-12-05
FR2899316B1 (fr) 2008-05-16
RU2410604C2 (ru) 2011-01-27

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