EP4551891A1 - Echangeur de chaleur a ailettes de hauteur variable et turbomachine correspondante - Google Patents
Echangeur de chaleur a ailettes de hauteur variable et turbomachine correspondanteInfo
- Publication number
- EP4551891A1 EP4551891A1 EP23751330.4A EP23751330A EP4551891A1 EP 4551891 A1 EP4551891 A1 EP 4551891A1 EP 23751330 A EP23751330 A EP 23751330A EP 4551891 A1 EP4551891 A1 EP 4551891A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- fins
- fluid
- longitudinal axis
- cylindrical surface
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0012—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the apparatus having an annular form
- F28D9/0018—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the apparatus having an annular form without any annular circulation of the heat exchange media
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
- F28F3/027—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0021—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for aircrafts or cosmonautics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0026—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for combustion engines, e.g. for gas turbines or for Stirling engines
Definitions
- TITLE FINNED HEAT EXCHANGER OF VARIABLE HEIGHT AND CORRESPONDING TURBOMACHINE
- the present invention relates to the general field of aeronautics. It relates in particular to a heat exchanger for a turbomachine, in particular an aircraft.
- An aircraft turbomachine and an aircraft comprise various organs and/or equipment which must be lubricated and/or cooled for their proper operation or fluids which must be cooled for the proper operation of the turbomachine.
- These members and/or equipment and/or fluids may be rotor guide means in the turbomachine, electrical and/or electronic components for electrical systems of the aircraft turbomachine, hot exhaust gases from the turbomachine intended to be introduced upstream of the combustion chamber, or even conditioning systems for the interior spaces of the aircraft.
- the heat released by these organs, equipment and/or fluids, which can be very significant, is evacuated by heat exchange in the turbomachine and/or the aircraft.
- the heat exchange is carried out using one or more heat exchangers which are installed in the turbomachine or in the aircraft and for various applications.
- heat exchangers generally use a cold source which can be ambient air, air from the secondary stream of the turbomachine, etc. and a hot source which can be the fuel of the turbomachine, oil, air (bleed air) taken from the low pressure or high pressure compressor of the turbomachine, or air from the primary stream of the turbomachine.
- Heat exchangers can be tube type, fin type, plate and fin type, etc. Plate and fin exchangers, and in particular those with offset strip fins, are used in turbomachines due to their low mass. These heat exchangers include rows of fins parallel to each other and fins which are arranged in a staggered or staggered manner. The heat exchanger can be configured in several stages. Generally speaking, a first fluid, for example, hot exhaust gases, and a second fluid, for example, an air flow circulating in the turbomachine, pass through the heat exchanger. An example of a plate and fin heat exchanger is described in patent document FR3077630.
- Prior art also includes the following documents, US-A-3818984, US-A-2792200, US-A1-2021/0180886, US-B2-10866030, US-A1-2016/0054071, US-A1-2021/ 0222963, US-A1-2012/0216543, FR-A1-3097257, US-A-2429508, and US-B2-8601791.
- Annular-shaped heat exchangers have been developed which favor integration into the turbomachine but which have other types of fin configuration.
- the arrangement of the fins in these annular heat exchangers present a significant pressure loss, in particular due to significant drag. It is difficult to increase the number of fins significantly to improve the performance of the turbomachine.
- the difference in temperatures of the fluids circulating in the heat exchanger of this type implies differences in the speed of circulation of the fluids. These speed differences are accentuated by the difference in hydraulic diameter and the hydraulic resistances which increase with the radius of the heat exchanger (in cylindrical coordinate). This leads to heterogeneity in the distribution of flows or fluids in the heat exchanger which can degrade hydraulic/aeraulic performance.
- the exchanger is generally sized so as to have an optimal convection thermal resistance ratio.
- the optimal thermal resistance ratio depends on the nature of the two fluids, temperatures/pressures/flows and pressure loss authorized for each of the fluids. This can be close to 1 if the fluids are of the same nature with relatively close temperature/pressure/flow conditions and close target pressure losses.
- the objective of the present invention is to provide a heat exchanger allowing better optimization of aerothermal and aerodynamic performance while reducing pressure losses and avoiding significantly impacting the mass.
- a heat exchanger for a turbomachine in particular an aircraft, of longitudinal axis
- the heat exchanger being intended to carry out a heat exchange between a first fluid and a second fluid
- the heat exchanger comprising at least a first panel, a second panel and a plurality of fins extending between the first and second panels, the fins being arranged in several rows along the longitudinal axis and being arranged in a staggered manner, each row of fins being parallel to each other and connected to each other, the heat exchanger being annular and centered on the longitudinal axis X, the first panel and the second panel extending radially between an internal cylindrical surface and an external cylindrical surface of the heat exchanger, the fins having a first and second exchange surfaces which are defined in planes substantially perpendicular to the radial axis of the heat exchanger and intended to be swept by the first following the longitudinal axis, and in that the fins of each row have a height which is on the one hand
- this solution makes it possible to achieve the aforementioned objective.
- the thermal performance of the heat exchanger is significantly improved.
- the heat exchanger offers relatively homogeneous and improved distribution of the first fluid.
- the increase in the height of the fins actually leads to a variation in the hydraulic diameter and the coefficients of the exchange surfaces. There will be less resistance to the flow of the first fluid at the level of the fins having a greater height.
- the geometric variations of the exchange surfaces make it possible to maintain a constant apparent permeability of the heat exchanger.
- the heat exchanger also includes one or more of the following features, taken alone or in combination: - the longitudinal pitch defining a distance between a trailing edge of a first fin of the plurality of fins and a leading edge of a second adjacent fin and successively of the plurality of fins, is constant.
- the fins are spaced radially with a transverse spacing which is constant.
- the fins are spaced radially by a transverse spacing, the transverse spacing decreasing from the internal cylindrical surface towards the external cylindrical surface.
- each fin has a length along the longitudinal axis which is constant.
- each fin has a length along the longitudinal axis which varies from upstream to downstream.
- the heat exchanger comprises several stages, the stages being spaced apart by passages intended for the circulation of the second fluid, the passages leading to an upstream surface and a downstream surface.
- the heat exchanger comprises several stages which are arranged around the longitudinal axis, the stages being spaced apart by passages intended to the circulation of the second fluid, the passages opening onto the internal cylindrical surface and the external cylindrical surface.
- the heat exchanger is made in one piece.
- the fins are connected alternately by top walls and base walls, the top walls and the base walls being connected respectively to the first and second panels.
- the heat exchanger comprises an inlet defined in an upstream surface in which the first fluid and/or the second fluid enters the heat exchanger and an outlet defined in an opposite downstream surface along the longitudinal axis by which the first fluid and/or the second fluid evacuates from the heat exchanger.
- the heat exchanger comprises an inlet defined in the internal cylindrical surface through which the second fluid enters the heat exchanger and an outlet defined in the external cylindrical surface through which the second fluid escapes from the heat exchanger .
- each fin is defined linearly and the length of the fin is determined using the parameter of the radial position of the fin in cylindrical coordinates, Rmin being the minimum radius of the heat exchanger defined by the internal cylindrical surface, Rmax being the maximum radius of the heat exchanger defined by the external cylindrical surface.
- the invention also relates to a turbomachine comprising a heat exchanger having any of the aforementioned characteristics, the first and second panels being arranged regularly around the longitudinal axis, the fins being arranged between the first and second panels.
- the invention further relates to an aircraft comprising a turbomachine as mentioned above.
- the invention also relates to a method of manufacturing a heat exchanger as mentioned above, the method comprises a step of producing the heat exchanger by additive manufacturing by selective fusion on powder beds.
- Figure 1 is a perspective view of a heat exchanger comprising plates and fins according to the invention
- Figure 2 is an axial sectional view of an example of a turbomachine to which the invention applies;
- Figure 3 is a schematic and front view of a stage of a heat exchanger according to the invention.
- Figure 4 is a perspective view of an example of fin arrangement of a heat exchanger according to the invention.
- Figure 5 is a radial sectional view of one embodiment of the heat exchanger according to the invention.
- Figure 6 is a radial sectional view of another embodiment of the heat exchanger according to the invention.
- Figure 7 is a front view of an example of a heat exchanger according to the invention.
- Figure 1 represents a heat exchanger 1 which allows a transfer of thermal energy between a first fluid 2 and a second fluid 3.
- the heat exchanger 1 is intended to be mounted in an aircraft turbomachine 4.
- heat exchanger 1 can be installed in any system where thermal energy transfer is necessary.
- FIG. 2 is shown, in an axial sectional view, a double flow turbomachine 4 of longitudinal axis X to which the invention can be applied.
- a double flow turbomachine 4 of longitudinal axis X to which the invention can be applied.
- other types of turbomachine are considered.
- the double flow turbomachine 4 generally comprises a gas generator or gas turbine engine 5 upstream of which a fan or fan module 6 is mounted.
- the terms “upstream” and “downstream” are defined in relation to the circulation of gases in the turbomachine and here along the longitudinal axis X and with reference to Figure 2 from left to right.
- the fan 6 comprises blades 7 which are shrouded by a fan casing 8.
- the fan casing 8 carries a nacelle 9.
- the latter is annular, centered on the longitudinal axis X and connected to the aircraft.
- the gas generator 5 comprises, from upstream to downstream, a low pressure compressor 10a, a high pressure compressor 10b, an annular combustion chamber 11, a high pressure turbine 12a and a low pressure turbine 12b.
- the turbomachine 1 comprises a low pressure shaft 13 which connects the low pressure compressor 10a and the low pressure turbine 12a to form a low pressure body and a high pressure shaft 14 which connects the high pressure compressor 10b and the high pressure turbine 13a to form a high pressure body.
- the low pressure shaft 13, centered on the longitudinal axis, here drives a fan shaft 15.
- a speed reducer 16 can be interposed, as here, between the fan shaft 15 and the low pressure shaft 13.
- rotating guide bearings 17 also make it possible to guide the low pressure shaft 13, the high pressure shaft 14 and the fan shaft 15 in rotation relative to a fixed structure of the turbomachine.
- the guide bearings 17 and the speed reducer 16 in this example of configuration of the turbomachine 1 must be lubricated and/or cooled to ensure the performance of the turbomachine.
- the power generated by these is dissipated in a fluid coming from a fluid supply source installed in the turbomachine and which makes it possible to lubricate and/or cool various organs and/or equipment of the turbomachine.
- Other equipment of the turbomachine or aircraft such as electrical machines, generators, batteries, an accessory box, electronic/electrical systems, cooling systems for the interior spaces of the aircraft, or even gases exhaust can have significant thermal energy to transfer.
- the heat exchanger 1 is described below in more detail in the context of its installation in a turbomachine and in this example allows the first fluid 2 to be cooled by the second fluid 3.
- the first fluid 2 comprises the gases leaving the compressor(s) and the second fluid 3 comprises the exhaust gases of the turbomachine 4 at the level of an ejection nozzle 18.
- the exhaust gases make it possible to heat, for example, the gas leaving the or compressors before passing through the combustion chamber 11. In fact, the heat from the exhaust gases is generally lost.
- the first fluid 2 is a secondary flow generated by the fan and the second fluid 3 is a secondary flow passing through the gas generator.
- the primary flow circulates in a primary vein 19 which is delimited radially by an internal wall 20a of an annular inter-vein casing 20 and an external wall 21a of an internal casing 21.
- the secondary flow circulates in a secondary vein 22 which is delimited radially by at least one internal wall 8a of the fan casing 8 and a wall 20b of the inter-vein casing 20 surrounding the gas generator.
- radially or “radial” is defined in relation to a radial axis Z which extends from the longitudinal axis L of the turbomachine 1 and which is perpendicular to it.
- the heat exchanger 1 comprises a primary exchange surface 23 and a secondary exchange surface 24.
- the primary exchange surface 23 comprises two panels (or plates) respectively called a first panel
- the heat exchanger 1 also comprises a plurality of fins 29 which extend between the first panel 25 and the second panel 26.
- the fins 29 form the secondary exchange surface 24.
- the fins 29 extend transversely to the first and second panels 25, 26.
- the fins 29 form channels 30 in which the first fluid 2 circulates.
- the first fluid 2 is intended to pass through/sweep the fins 29 and to flow between the first and second panels 25, 26.
- FIG. 4 represents in perspective the fins 29 of the heat exchanger 1 without the panels 25, 26.
- Each fin 29 has a generally planar shape and extends in a first direction D1.
- the fins 29 each have a leading edge 29a and a trailing edge 29b of the first fluid 2.
- the leading edges 29a and trailing edges 29b are opposite in the first direction D1.
- the leading edges 29a and trailing edges 29b longitudinally delimit the fins 29.
- the leading edge 29a is the edge by which the first fluid 2 first comes into contact with the fin 29.
- the trailing edge 29b is the edge with which the first fluid 2 is last in contact with the fin 29.
- the leading edges 29a and trailing edges 29b extend generally in the second direction D2.
- Each fin 29 also comprises a first exchange surface 29c and a second exchange surface 29d which are interconnected by the leading edges 29a and trailing edges 29b.
- the first and second exchange surfaces 29c, 29d are opposite in a third direction D3.
- the third direction D3 is perpendicular to the first and second directions D2, D3.
- each fin 29 has a generally rectangular shape in this example.
- the fins 29 have a trapezoidal shape or any other shape or can still be inclined relative to the plane D1, D2 in the example of Figure 4.
- the first direction D1 is parallel to the longitudinal axis X of the turbomachine 1.
- the fins 29 are arranged in several rows R1, R2, Rn in the first direction D1.
- Each row of fins comprises several fins 29.
- the rows of fins 29 are parallel to each other.
- the rows R1, R2, Rn of fins 29 are parallel to the third direction D3.
- the fins 29 are also arranged in a staggered manner. More precisely, the fins 29 are offset in the third direction D3. Advantageously, the fins 29 of every other row are located in the same plane parallel to the plane D1, D2. This arrangement makes it possible to improve heat exchange by interruption and regular reformation of the thermal boundary layer on the surface of the fins 29.
- the thermal boundary layer is interrupted at the trailing edge of each fin 29 and reforms at the leading edge. of each fin 29.
- each fin 29 is located at a distance from the adjacent fin 29 along the first direction D1 and along a determined longitudinal pitch PI. More precisely, the pitch PI defines the distance between the trailing edge 29b of a first fin and the leading edge 29a of a second adjacent fin and successively. Each row of fins is also spaced apart from each other following this longitudinal pitch PI.
- the longitudinal pitch PI is constant.
- the fins 29 of the same row are spaced from each other transversely (in the third direction D3).
- a transverse spacing is thus provided between each fin 29 transversely. More precisely, the transverse spacing s defines the distance between a first exchange surface 29 of a first fin 29 and a second exchange surface 29d of a second fin.
- the fins 29 of each row are connected to each other alternately by a top wall 31 and by a base wall 32.
- the top walls 31 and the base walls 32 have a generally flat shape and are opposite in the second direction D2.
- the top walls 31 and the base walls 32 extend in the first direction D1.
- the fins 29 of the adjacent rows along the first longitudinal direction are connected to each other via the top walls 31.
- These top walls 31 and base walls 32 have a leading edge 33a connected to the leading edges 29a of the fins 29 and a trailing edge 33b connected to the trailing edges 29b of the fins 29.
- the fins 29 are fixed to the first and second panels 25, 26.
- the fixing is carried out via the top walls 31 and the base walls 32.
- the fixing can be carried out by welding or brazing.
- the heat exchanger 1 can be presented in the form of one stage or several stages.
- a single floor is shown.
- a stage is defined by the fins 29 and by the first and second panels 25, 26.
- the first fluid 2 circulates through the fins 29, in the channels 30 and between the two panels 25, 26 while the second fluid 3 circulates above the first panel 25 and below the second panel 26.
- the stages would be spaced apart by passages in which the second fluid is intended to circulate. Each passage would be formed between two adjacent panels 25, 26 of different floors.
- the heat exchanger 1 is annular (360°) or in the shape of an angular sector.
- the heat exchanger 1 is centered on the first longitudinal direction D1.
- the first direction D1 is centered on the longitudinal axis
- the annular heat exchanger 1 has an internal cylindrical surface 34a defining an internal radius Ri and an external cylindrical surface 34b defining external radius Re.
- the heat exchanger 1 also has an upstream surface 35 (or front surface) and a downstream surface 36 which are opposite along the longitudinal axis (first direction).
- the upstream surface 35 and the downstream surface 36 are connected by the internal and external cylindrical surfaces 34a, 34b.
- the heat exchanger 1 includes an inlet E through which the first fluid 2 enters the heat exchanger 1.
- the inlet E is defined at the upstream surface 35.
- the heat exchanger 1 also includes an outlet S by which the first fluid 2 escapes from the heat exchanger 1.
- the outlet S is defined at the downstream surface 36.
- the first fluid 2 circulates axially, from upstream to downstream, and along the longitudinal axis.
- the heat exchanger 1 comprises another inlet and another outlet through which the second fluid 3 enters the heat exchanger.
- the second fluid 3 can circulate in the heat exchanger 1 axially (along the longitudinal axis) or radially (along the radial axis).
- the fins are configured to improve the aerothermal and aerodynamic performance of the annular heat exchanger.
- the fins 29 have a height H which varies linearly along the radial axis of the heat exchanger.
- the height H of each fin is measured between the first panel 25 and the second panel 26.
- the first fluid circulates in a direction normal to the plane of Figure 5.
- the lines which are arranged in the circumferential direction around the longitudinal axis and which define heights H1, H2, etc. . represent trailing or leading edges or the thickness of the fin between the first and second exchange surfaces 29c, 29d following the radial section.
- the height H of the fins 29 increases linearly from the internal cylindrical surface 34a to the external cylindrical surface 34b.
- the height of the fins varies transversely to the flow of the first fluid.
- the fins 2 of the same row R1, R2, Rn along the radial axis have a height H1, H2, H3, H4, H5 which is different.
- the first and second exchange surfaces 29c, 29d of the fins 29 are defined in a plane which is perpendicular or substantially perpendicular (+/- 5°) to the radial axis.
- the fins of the same row which extends along the longitudinal axis have an identical height.
- the fins 29 which are closer to the longitudinal axis have a height H1 which is the minimum and the fins which are furthest from the longitudinal axis have a maximum height Hn.
- the hydraulic diameter of the heat exchanger is larger at the external cylindrical surface 34b.
- the first fluid can flow easily and with less resistance at the level of the fins close to the external cylindrical surface 34b compared to the first fluid entering the heat exchanger at the level of the fins close to the internal cylindrical surface 34a.
- the flow rate is lower near the internal cylindrical surface. With the variation in height, heat exchange is also improved and pressure losses are avoided.
- the transverse spacing s between the fins 29 along the radial axis is constant.
- the first fluid 3 is oriented in the axis normal to the plane of Figure 5.
- the first fluid 2 circulates along the longitudinal axis.
- the spacing is for example between 5 and 100 mm.
- the fins 29 each have a predetermined length L which is constant.
- the length L of each fin is measured (along the first direction D1 (longitudinal axis) and) between the leading edge 29a and the trailing edge 29b.
- the length L of each fin 29 is for example between 0.5 mm and 150 mm.
- the length L of the fins can vary linearly.
- the height H of the fins 29 and the transverse spacing s between the fins of the same row vary.
- the transverse spacing s1, s2, s3, s4, s5, s6 between each fin 29 along the radial axis decreases or decreases from the internal cylindrical surface 34a to the external cylindrical surface 34b.
- the variation of the spacing is continuous in an advantageous manner.
- the spacing increases here with the radius of the heat exchanger (i.e. along the radial axis).
- the height H increases linearly from the internal cylindrical surface 34a to the external cylindrical surface 34b.
- the fins 29 which are close to the longitudinal axis have the same height H1.
- the fins of each row and which are furthest from the longitudinal axis also have the same height H5.
- the speed of the first fluid 2 is greater, particularly near the external cylindrical surface 34b.
- the transverse spacing s close to the longitudinal axis is between 5 mm and 100 mm and the transverse spacing s between the fins furthest from the longitudinal axis is between 5 mm and 50 mm.
- the variation of the transverse spacing makes it possible to compensate and adjust the permeability which has increased thanks to the variation of the fin heights.
- the transverse spacings decrease with the radius of the heat exchanger.
- the distribution of the second fluid is more homogeneous.
- the length L of the fins is constant but can also vary linearly.
- the longitudinal pitch PI between each fin 29 is constant.
- the longitudinal pitch can be between 0.5 mm and 50 mm.
- FIG. 7 shows schematically and in radial section, a heat exchanger 1 mounted in the turbomachine.
- the heat exchanger 1 is annular and centered on the longitudinal axis X.
- the heat exchanger 1 has several stages which are arranged around the longitudinal axis is non-uniform.
- the first and second panels 25, 26 each extend radially with respect to the longitudinal axis X.
- the first and second exchange surfaces 29, 29d of each row of fins 29 are defined in planes perpendicular to the axis radial.
- the exchange surfaces 29c, 29d are swept by the first fluid along the longitudinal axis.
- the channels 30 formed by the fins 29 open onto the upstream surface 35 and onto the downstream surface 36.
- the length L of the fins 29 also extends axially. Between each stage is formed the passage 37 intended for the circulation of the second fluid. Each passage 37 extends between a radially internal end 37a and a radially external end 37b.
- the radially internal end 37a of the passages 37 opens into the internal cylindrical surface 34a.
- the radially outer end 37b opens into the outer cylindrical surface 34b.
- the passages 37 open into the upstream surface 35 which can form an inlet for the second fluid 3.
- the passages 37 also open into the downstream surface which can form an outlet for the second fluid 3.
- the height H of the fins 29 increases along the radial axis (i.e. from the central axis of the heat exchanger 1 towards the position farthest from the center).
- the transverse spacing is constant in Figure 7.
- each fin 29 can be defined linearly.
- ⁇ r the transverse spacing between the fins 29 and in function of the radial position of the fin in cylindrical coordinates.
- the parameter X r can be between 1.2 and 1.8.
- the fins are wavy and have offset pitches.
- the first fluid 2 circulates along the longitudinal axis.
- the first fluid 2 advantageously enters the heat exchanger at the upstream, front surface 35 and leaves at the downstream surface 36.
- the second fluid 3 circulates along the longitudinal axis and/or along the radial axis.
- the fins 29, the first panels 25 and the second panels 26 are formed in one piece (commodity or in one piece).
- these are obtained by an additive manufacturing process and in particular selective fusion on powder beds known by the English acronym SLM for “Selective Laser Melting”.
- SLM Selective Laser Melting
- This process is particularly suitable for producing the annular heat exchanger in a single piece.
- the process makes it possible to obtain complex shapes and parts with good strength and mechanical characteristics.
- the principle of SLM additive manufacturing is based on the fusion of thin two-dimensional (2D) layers of powder, for example metal, plastic, or ceramic, using a high-power laser.
- the heat exchanger is devoid of top walls and base walls.
- the process in fact allows a direct connection of the fins and the first and second panels 25, 26.
- Additive manufacturing is carried out from an SLM installation which generally comprises a supply tank containing a powder and a manufacturing support on which the part to be manufactured is produced, in this case the heat exchanger 1.
- the installation also includes a scanning element making it possible to transfer a quantity of powder from the supply tank onto the manufacturing support which is mounted in a movable manner following a vertical translation Z.
- the installation also includes an element for generating a laser beam making it possible to melt the powder intended to make the part and means making it possible to direct the laser beam towards the support such as mirrors.
- a recycling tank allows unused or unfused powder to be recycled.
- the process consists of manufacturing the part by superimposing layers of powder from the supply tank and transferred to the manufacturing support. These layers of powder are then melted one after the other by means of the laser beam moving over the surface of each layer. The temperature of the powder is raised to a temperature above the melting temperature of the powder via the laser beam. The melted layers gradually solidify and form a single block.
- the different layers intended to form the heat exchanger are superimposed along a manufacturing axis which is parallel to the first direction D1.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2207030A FR3137753B1 (fr) | 2022-07-08 | 2022-07-08 | Echangeur de chaleur a ailettes de hauteur variable et turbomachine correspondante |
| PCT/FR2023/051013 WO2024009030A1 (fr) | 2022-07-08 | 2023-07-03 | Echangeur de chaleur a ailettes de hauteur variable et turbomachine correspondante |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4551891A1 true EP4551891A1 (fr) | 2025-05-14 |
Family
ID=83355398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23751330.4A Pending EP4551891A1 (fr) | 2022-07-08 | 2023-07-03 | Echangeur de chaleur a ailettes de hauteur variable et turbomachine correspondante |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4551891A1 (fr) |
| CN (1) | CN119522350A (fr) |
| FR (1) | FR3137753B1 (fr) |
| WO (1) | WO2024009030A1 (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574872A (en) * | 1982-11-04 | 1986-03-11 | Matsushita Electric Industrial Co., Ltd. | Heat exchanger apparatus |
| EP4070957A1 (fr) * | 2021-04-09 | 2022-10-12 | Hamilton Sundstrand Corporation | Échangeurs de chaleur |
| US20220356843A1 (en) * | 2019-06-17 | 2022-11-10 | Sogeclair Sa | Heat exchanger for cooling an aircraft propulsion engine |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB567880A (en) * | 1943-02-05 | 1945-03-07 | James Frank Belaieff | Improvements in, or relating to, plate heat exchange apparatus |
| US2792200A (en) * | 1952-03-15 | 1957-05-14 | Modine Mfg Co | Toroidal type heat exchanger |
| US3818984A (en) * | 1972-01-31 | 1974-06-25 | Nippon Denso Co | Heat exchanger |
| EP2339123B1 (fr) * | 2009-12-23 | 2013-07-10 | Techspace Aero S.A. | Paroi intérieure annulaire de la veine secondaire d'un turboréacteur et procédé d'assemblage d'une telle paroi |
| US9395122B2 (en) * | 2011-02-28 | 2016-07-19 | Pratt & Whitney Canada Corp. | Diffusing gas turbine engine recuperator |
| EP3183524B1 (fr) * | 2014-08-22 | 2020-11-04 | Mohawk Innovative Technology Inc. | Échangeur thermique à faible perte de charge à haute efficacité |
| EP3521742B1 (fr) * | 2018-02-01 | 2020-07-22 | Hamilton Sundstrand Corporation | Échangeur de chaleur |
| FR3077630B1 (fr) | 2018-02-02 | 2020-11-27 | Safran | Echangeur de chaleur |
| US11333452B2 (en) * | 2019-12-16 | 2022-05-17 | Hamilton Sundstrand Corporation | Conformal heat exchanger passage features for improved flow distribution |
| US11674758B2 (en) * | 2020-01-19 | 2023-06-13 | Raytheon Technologies Corporation | Aircraft heat exchangers and plates |
-
2022
- 2022-07-08 FR FR2207030A patent/FR3137753B1/fr active Active
-
2023
- 2023-07-03 WO PCT/FR2023/051013 patent/WO2024009030A1/fr not_active Ceased
- 2023-07-03 CN CN202380052598.6A patent/CN119522350A/zh active Pending
- 2023-07-03 EP EP23751330.4A patent/EP4551891A1/fr active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4574872A (en) * | 1982-11-04 | 1986-03-11 | Matsushita Electric Industrial Co., Ltd. | Heat exchanger apparatus |
| US20220356843A1 (en) * | 2019-06-17 | 2022-11-10 | Sogeclair Sa | Heat exchanger for cooling an aircraft propulsion engine |
| EP4070957A1 (fr) * | 2021-04-09 | 2022-10-12 | Hamilton Sundstrand Corporation | Échangeurs de chaleur |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2024009030A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119522350A (zh) | 2025-02-25 |
| WO2024009030A1 (fr) | 2024-01-11 |
| FR3137753A1 (fr) | 2024-01-12 |
| FR3137753B1 (fr) | 2024-08-16 |
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