EP4229285A1 - Turboreacteur a performances de prelevement d'air ameliorees - Google Patents
Turboreacteur a performances de prelevement d'air amelioreesInfo
- Publication number
- EP4229285A1 EP4229285A1 EP21810075.8A EP21810075A EP4229285A1 EP 4229285 A1 EP4229285 A1 EP 4229285A1 EP 21810075 A EP21810075 A EP 21810075A EP 4229285 A1 EP4229285 A1 EP 4229285A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- arms
- zone
- bleed
- gooseneck
- 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.)
- Pending
Links
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
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/04—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output
- F02C6/06—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output providing compressed gas
- F02C6/08—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output providing compressed gas the gas being bled from the gas-turbine compressor
-
- 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
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/16—Control of working fluid flow
- F02C9/18—Control of working fluid flow by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages
-
- 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
- F05D2240/00—Components
- F05D2240/10—Stators
- F05D2240/15—Heat shield
-
- 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
Definitions
- TITLE TURBOJET WITH IMPROVED AIR SAMPLING PERFORMANCE
- This presentation relates to a turbojet engine, in particular for an aircraft.
- twin-body turbojet engines for aircraft which comprise a first low-pressure (LP) compressor-turbine body and a second high-pressure (HP) compressor-turbine body.
- LP low-pressure
- HP high-pressure
- This type of turbojet generally incorporates, downstream of the variable-pitch stages of the high-pressure (HP) compressor, an air bleed system intended to supply an aircraft air conditioning system.
- HP high-pressure
- An example of such a turbojet is described in patent application FR 2 860 041.
- the bleed of air carried out in this zone of the turbojet makes it possible to bleed air at a sufficiently high pressure to be able to be used in an aircraft air conditioning system, taking into account the current operating constraints of such a system.
- the present invention thus relates to an aircraft turbojet comprising successively, from upstream to downstream in the direction of circulation of a primary air stream, a low pressure casing, a casing intermediate and a high pressure casing which are generally aligned in a longitudinal direction XX', the low pressure, intermediate and high pressure casings jointly delimiting an internal annular passage for the circulation of the primary air stream from upstream to downstream, the casing intermediate comprising a portion of said annular passage which is called a gooseneck, the intermediate casing comprising:
- -an air discharge system VBV which is able to take air from the primary air stream flowing in a first zone ZI of the gooseneck and to discharge it out of the annular passage
- -a take-off system air which is able to take air from the primary air stream circulating in a second zone of the gooseneck, the taken air being intended for an aircraft air conditioning system ECS
- the second zone air bleed Z2 being disposed downstream of the first air bleed zone ZI, -in the second air bleed zone Z2 of the gooseneck, several arms which extend radially and according to a circumferential distribution in the gooseneck following a view in a transverse plane relative to the longitudinal direction XX'
- the air sampling system comprising at least a part of these arms which are each configured to take air from the second zone Z2 by through at least one slot and conveying this sampled air , said at least one slot extending from the base of the configured arm in the direction of radial extension thereof, over a distance which represents between 30 and 70% of the total radial extension of
- the pressure of the air bleed from the primary air stream at this location is lower than the air pressure that would be bleed from this stream downstream of the high pressure crankcase compressor.
- the air is taken from a second zone separate from the first zone and located downstream of the latter so as not to interfere with the taking of the first zone.
- the air sampling system of the second zone is thus separate from the air discharge system VBV which is able to take air from the first zone.
- the air bleed which is thus carried out between the low pressure casing and the high pressure casing makes it possible to reduce the section necessary for the passage of the air (in the annular passage) in the direction of the compressor of the high pressure casing, more particularly in the zone located between the gooseneck and the high pressure sampling port of the prior art (port which is generally located downstream of the variable pitch stages of the compressor of the high pressure crankcase).
- This passage section reduction can offer several design possibilities:
- the air sampling system is configured independently of the air discharge system in order to be able to sample air without depending on the air discharge system which is used during flight phases. different from the aircraft. In particular, from each separate zone where the air is taken by one of the two systems, the air taken by one system is no longer in contact with the air taken by the other system.
- the air intake at the base of the configured arms makes it possible to capture air in an area of the air stream that is not very polluted by particles (ice, hail, water, sand, etc.), which makes it possible to supply the air conditioning system with air that is not very polluted and thus to protect it from deterioration, fouling and clogging.
- a particle trap is generally not necessary.
- the slot is arranged at the level of the leading edge of the configured arm; this air inlet arrangement makes it possible to maximize the recovery of dynamic pressure and thus to increase the level of air pressure taken from this area;
- the leading edge locally takes the form of two facing parallel inlet lips, which are spaced from each other in such a way in forming between them the slot enabling air to be taken from the second zone and introduced into the configured arm;
- the configured arms each comprise an internal routing duct for conveying the bleed air through the slot inside said arm and up to an outlet opening thereof;
- the DHW air bleed system comprises at least one air manifold which is fluidically isolated from the VBV air discharge system; the fluidic isolation (sealing) of the manifold(s) from the VBV air relief system allows air that is bleed by the air relief system not to enter the manifold air, thus avoiding polluting the air of the collector; the air manifold being for supplying bleed air to the ECS aircraft air conditioning system;
- said at least one air collector is connected to at least part of the configured arms and is itself configured to collect the air drawn in and routed by said configured arms; said at least one air manifold thus comprises as many openings for communication with the configured arms as the turbojet engine comprises configured arms;
- said at least one air collector is arranged at the periphery of the configured arms of said at least part of the configured arms; said at least one air manifold therefore does not necessarily extend along 360° but it extends circumferentially so as to connect the configured arms;
- -said at least one air collector extends circumferentially over an angular sector substantially corresponding to that covered by the circumferential arrangement of the configured arms; -said at least one air manifold is arranged downstream of the leading edge of the configured arms of said at least part of the configured arms.
- Figure 1 is a partial schematic view in longitudinal section of an embodiment of a turbojet engine according to the invention of which only a part higher than the longitudinal axis XX' of the turbojet engine is shown;
- Figure 2 is a schematic view in cross section with respect to the axis XX 'showing the arrangement of a bleed air manifold at the periphery of a plurality of radial bleed arms used in the turbojet of the embodiment of Figure 1 for air sampling;
- Figure 3 is a schematic cross-sectional view of the outer profile of a radial arm used in the turbojet of the embodiment of Figure 1 for air bleed;
- Figure 4 is a schematic view of an alternative embodiment of the arrangement of Figure 2.
- Figure 1 shows part of an aircraft turbojet engine 10 according to one embodiment of the invention.
- a turbojet engine has a generally longitudinal shape centered around a longitudinal axis XX'.
- the represented part of the turbojet illustrates a local internal region of the turbojet in which the invention has been implemented in order to modify the configuration of this internal region.
- the turbojet engine 10 comprises in this region successively, from upstream to downstream in the direction of circulation of a primary air stream illustrated by the arrow F (this air stream comes from the air inlet of the turbojet), a casing or low pressure (LP) body 12 containing in particular a compressor and a low pressure turbine (only the blades are visible in FIG. 1), a casing or intermediate body 14 and a casing or high pressure (HP) body 16 containing in particular a compressor and a high pressure turbine (only the blades are visible in Figure 1).
- LP low pressure
- HP high pressure
- FIG. 1 The passage 18 is bordered internally and externally by two respective envelopes 20 ( central hub which defines the wall of smaller radius) and 22 (wall of larger radius often referred to as the casing) which define its contour.
- the internal annular passage 18 comprises a portion or portion of annular passage called "gooseneck" 18a, located in the intermediate casing 14 and which defines, for the primary air stream flowing in the passage, a transition zone between the low pressure 12 and high pressure 16 casings.
- the intermediate casing 14 comprises an air discharge system VBV which is capable of taking, downstream of the low pressure compressor, air from the primary air stream flowing in a first zone ZI of the gooseneck 18a and to discharge it out of the annular passage, for example into the secondary stream of the turbojet engine, not shown here.
- VBV air discharge system
- an upward arrow illustrates the air bleed carried out in the first zone ZI of the gooseneck, located in the upper part of the annular passage portion (near the outer envelope 22 of the annular passage 18) but not discharge the bleed air.
- the components (air extraction valve(s), etc.) of the mechanism of this VBV system known per se are not represented, except for a cavity called "VBV cavity", located above the gooseneck 18a and which receives the air taken from zone Z1.
- the intermediate casing 14 comprises, arranged in the gooseneck 18a and downstream of the first air bleed zone ZI of the air discharge system VBV, a plurality of arms 24, 26, 28, 30, 32, 34 which extend radially relative to the longitudinal axis XX' and which are distributed circumferentially along the annular arrangement of the annular passage portion formed by the gooseneck 18a.
- Figure 1 illustrates, in longitudinal section, part of the internal configuration of the arm 28 which is not visible in the other figures.
- the intermediate casing 14 also includes an air sampling system 40 which is able to take air from the primary air stream flowing in a second zone Z2 of the gooseneck 18a, separate from the first zone ZI and located downstream thereof, to supply it to an air conditioning system of the aircraft equipped with the turbojet engine, called ECS, not shown here.
- the air bleed system 40 is generally arranged downstream of the air discharge system VBV in the intermediate casing 14 and each of the two systems defines a separate air path.
- the radial arms illustrated in Figures 1 and 2 do not all have the same function in this embodiment. Indeed, the arms 24 to 32 have a particular configuration which is dedicated to the air sampling of the air sampling system 40 and which makes it possible, in particular, to sample and convey inside these arms air from the primary air stream which circulates in the second zone Z2. These arms which have this particular configuration are called pick-up arms.
- the arm 34 for its part, does not have such a configuration. However, it performs the known function of structural support and is called a radial arm (RDS).
- RDS radial arm
- the number of arms having a dedicated configuration may vary from one embodiment to another. In the present embodiment the total number of arms is six but it can for example vary between 3 and 12.
- the number of arms used for the air bleed function generally does not reach the total number N of arms of the intermediate casing and it is generally at most N-l arms, for example so that one arm is assigned to the controls (eg: RDS, pipes) to facilitate integration.
- the air sampling function of the sampling arms (dedicated to the air sampling system 40) is ensured by the presence of a air inlet or bleed slot which is arranged, here, at the level of the leading edge of the arms concerned 24 to 32, in the second zone Z2, and which is independent of the air bleed upstream of the VBV system, performed in the first zone Zl.
- the dynamic pressure of the air taken from this location (second zone Z2) is thus maximized.
- the respective slots 25, 27, 29, 31, 33 of these arms each extend radially, following the radial extension of the arms 24 to 32, from the base of the latter which is located on the casing. internal or central hub 20, as illustrated in FIG. 2.
- the air taken in through the slots (second zone Z2) is that which flows into the gooseneck 18a along the wall of the casing 20 (vein internal) and is thus less polluted than the air sampled by the VBV discharge system, upstream and rather in the upper part of the primary air stream (first zone Z1).
- the air taken in through the slots (second zone Z2) is thus distributed circumferentially in the gooseneck at the base of the take-off arms.
- each picking slot extends over a distance which represents between 30 and 70% of the total radial extension of the arm in which it is arranged from the base of the picking arm considered (30 and 70% of the height of the air stream), which makes it possible to limit the air intake to a slightly polluted zone of the primary air stream.
- the slits integrated into the sampling arms thus start from a zone located in the internal vein of the flow and are therefore "robust" with respect to the particles.
- the slits integrated into the bleed arms make it possible to recover more dynamic pressure than if the air bleed took place in a manner not integrated into the arms, for example upstream of the arms.
- the pressure drop of the intermediate casing 14 is thus relatively reduced compared to air intake configurations which would not be integrated into the arms.
- the external profile of one of the arms configured to take air from the primary air stream for example the arm 28 of Figure 1, is shown in Figure 3 which is a cross-sectional view by relative to the radial direction of extension of the arm (the internal configuration of the arm is not shown in Figure 3).
- the profile is substantially that of an aircraft wing whose leading edge 28a has been modified locally (along the height or direction of radial extension of the slot as defined above) to arrange the air intake slot 29 therein.
- the conventional profile of the leading edge is shown in dotted lines in Figure 3.
- the modified leading edge 28a locally takes the form of two air inlet lips 28b, 28c parallel to each other and facing each other.
- the two lips 28b, 28c are spaced from each other (in a direction of the plane of Figure 3 which is perpendicular to the direction connecting the leading edge to the trailing edge of the profile), so as to provide between they have an opening of given width.
- the two lips 28b, 28c extend perpendicular to the plane of Figure 3, that is to say radially along the radial extension of the arm and from its base, so as to form the extension slot radial 29 which makes it possible to take air from the primary air stream (second zone Z2) and to cause it to penetrate into the arm.
- the two lips 28b, 28c also extend, in the direction connecting the leading edge to the trailing edge of the profile, over a length (axial distance) sufficient to channel the air taken in as illustrated by the horizontal arrow in FIG. 3.
- the configured arms 24 to 32 of the air sampling system 40 each include an internal routing duct (internal duct 28d in Figure 1 for the arm 28) to route the air sampled through their slot (slot 29 for the arm 28) inside the arm concerned and this, up to an outlet opening of the latter which is located opposite the base of the arm (here the opening 28e for the arm 28 on Figures 1 and 2).
- the internal air routing ducts of the arms are not represented in FIG. and 32nd arms are shown in Figure 2.
- the air sampling system 40 comprises at least one air manifold 42 which is connected to at least a part of the arms configured 24 to 32 and which is itself configured to collect the air taken in and routed through these arms.
- a single manifold 42 is used in the air bleed system 40 to collect the air that is bleed through the slots 25-33 of the set of arms 24-32 and routed through these latter to their respective peripheral outlet openings 24th to 32nd.
- Said at least one air manifold here the single manifold 42, is arranged at the outer periphery of the configured arms 24 to 32, and thus extends circumferentially over an angular sector substantially corresponding to that covered by these arms, as illustrated in FIG. 2.
- the use of all the arms 24 to 32, with the exception of the radial arm 34, to take in air makes it possible to maximize the take-off section as well as the angular extension of the manifold.
- a limited number of arms can be used to take in air. By way of example, it may be envisaged to use one arm out of two for sampling or else to use arms distributed along a given angular sector.
- the collector 42 takes for example the form of a hollow peripheral box, located beyond the outer casing 22 deviating from the longitudinal axis in Figure 1, and surrounding part of the gooseneck 18a in a cross-sectional view like that of Figure 2.
- the manifold 42 is connected to the arms 24 to 32 so as to be in fluid communication with the internal conveying ducts of said arms via their respective outlet openings 24th to 32nd.
- the air manifold 42 is arranged, here, downstream of the leading edge of the arms configured, as shown in Figure 1 with the arm 28.
- This arrangement makes it possible to take into account the local configuration of the discharge system VBV whose VBV cavity is positioned substantially plumb with arm 28 in FIG. 1.
- the assembly formed by the air intake arms and the air collector or collectors is generally arranged downstream of the VBV discharge system, regardless of the number of collectors and the number and layout of the sampling arms.
- the air collector is fluidically isolated from the VBV discharge system, in particular from the VBV cavity, that is to say that the structure of the air collector (and its connection with the arms of sampling) is designed tight/fluid tight to the adjacent LSV cavity.
- This ensures that the air sampled by the VBV air discharge system and present in particular in the VBV cavity (this air is relatively polluted by ice, sand and other pollutants and is in any case generally more polluted than the air sampled by the system 40; in fact, the position of the sample close to the hub prevents the sampled air from being polluted due to a centrifugation effect of the debris towards the outer wall) cannot penetrate into the air collector of the system 40 air bleed 40 for subsequent use in the ECS air conditioning system.
- the fluidic isolation of the air collector vis-à-vis the VBV discharge system makes it possible to ensure that there is no fluidic interference between the two systems, in particular from their areas respective air bleed ZI and Z2. Indeed, from the moment when air is taken from the second zone Z2 of the gooseneck 18a by the take-off arms, this air is conveyed into these arms, then into the collector and does not come into contact with air outside the sampling system 40, in particular with air sampled by the VBV discharge system.
- the air bleed system 40 also includes a pipe 44 which connects the manifold 42 to the DHW air conditioning system, not shown.
- Line 44 extends downstream of the manifold as shown in Figure 1 and collects the air collected by the manifold from the sampling arms (sensor arms), as shown by the arrows in Figure 2. It will be noted that any what was mentioned above about the air collector applies to several air collectors.
- Figure 4 shows an alternative embodiment of the cross section of Figure 2 with the same total number of arms but with two independent air manifolds 50, 52 instead of just one.
- the two air manifolds 50, 52 are each connected to several arms which are arranged along separate angular sectors.
- the collector 50 is connected to two pick-up arms 24, 26 and the collector 52 is connected to two pick-up arms 30, 32.
- the arm 28 diametrically opposed with respect to the radial arm 34 n is not configured like the arms 24, 26, 30 and 32 with a sampling slot and an internal duct for conveying the sampled air and is therefore not used for the sampled air.
- Each collector 50, 52 is here connected to a respective pipe 54, 56.
- the two pipes 54, 56 join in a common pipe (not shown) which is connected to the DHW air conditioning system not shown.
- the air bleed system 40 and the air discharge system VBV are independent of each other structurally and functionally and are in particular implemented / actuated at different times depending on the flight phase of the aircraft.
- the turbojet engine is of the double body type.
- the turbojet engine can however be of the triple spool type.
- the turbojet engine can be of the fan type (“turbofan” in English terminology) or be a propeller engine.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2010716A FR3115326A1 (fr) | 2020-10-19 | 2020-10-19 | Turboreacteur a performances de prelevement d’air ameliorees |
| PCT/FR2021/051812 WO2022084614A1 (fr) | 2020-10-19 | 2021-10-19 | Turboreacteur a performances de prelevement d'air ameliorees |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4229285A1 true EP4229285A1 (fr) | 2023-08-23 |
Family
ID=73699115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21810075.8A Pending EP4229285A1 (fr) | 2020-10-19 | 2021-10-19 | Turboreacteur a performances de prelevement d'air ameliorees |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US12352205B2 (fr) |
| EP (1) | EP4229285A1 (fr) |
| CN (1) | CN116324145A (fr) |
| FR (1) | FR3115326A1 (fr) |
| WO (1) | WO2022084614A1 (fr) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2860041B1 (fr) | 2003-09-22 | 2005-11-25 | Snecma Moteurs | Realisation de l'etancheite dans un turboreacteur pour le prelevement cabine par tube a double rotule |
| US8192143B2 (en) * | 2008-05-21 | 2012-06-05 | United Technologies Corporation | Gearbox assembly |
| FR2958747B1 (fr) * | 2010-04-12 | 2012-04-27 | Snecma | Dispositif de mesure de temperature dans une veine d'ecoulement de flux primaire d'un turboreacteur a double flux |
| WO2015122934A1 (fr) * | 2014-02-14 | 2015-08-20 | United Technologies Corporation | Collecteur de système de régulation environnementale intégrée |
| US9909497B2 (en) * | 2015-05-07 | 2018-03-06 | United Technologies Corporation | Combined stability and customer bleed with dirt, water and ice rejection |
| GB201704173D0 (en) * | 2017-03-16 | 2017-05-03 | Rolls Royce Plc | Gas turbine engine |
-
2020
- 2020-10-19 FR FR2010716A patent/FR3115326A1/fr active Pending
-
2021
- 2021-10-19 WO PCT/FR2021/051812 patent/WO2022084614A1/fr not_active Ceased
- 2021-10-19 US US18/249,417 patent/US12352205B2/en active Active
- 2021-10-19 EP EP21810075.8A patent/EP4229285A1/fr active Pending
- 2021-10-19 CN CN202180071265.9A patent/CN116324145A/zh active Pending
-
2025
- 2025-06-13 US US19/237,329 patent/US20250305448A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022084614A1 (fr) | 2022-04-28 |
| CN116324145A (zh) | 2023-06-23 |
| US20240110523A1 (en) | 2024-04-04 |
| FR3115326A1 (fr) | 2022-04-22 |
| US12352205B2 (en) | 2025-07-08 |
| US20250305448A1 (en) | 2025-10-02 |
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