CA2647570C - Heat exchange system in a turbomachine - Google Patents
Heat exchange system in a turbomachine Download PDFInfo
- Publication number
- CA2647570C CA2647570C CA2647570A CA2647570A CA2647570C CA 2647570 C CA2647570 C CA 2647570C CA 2647570 A CA2647570 A CA 2647570A CA 2647570 A CA2647570 A CA 2647570A CA 2647570 C CA2647570 C CA 2647570C
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- CA
- Canada
- Prior art keywords
- heat exchange
- oil
- fluid
- exchange system
- oil circuits
- 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.)
- Expired - Fee Related
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Classifications
-
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
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- 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
-
- 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
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
- F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
-
- 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
- F28D9/0093—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
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- 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
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
-
- 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
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/213—Heat transfer, e.g. cooling by the provision of a heat exchanger within the cooling circuit
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a heat exchange system in a turbine engine comprising a number of units and equipment (10,20) to be cooled and/or lubricated, sais system comprising at least two distinct oil circuits (2,3) to cool and/or lubricate said equipment (10,20), characterized in that said system is configured to put said oil circuits (2,3) in thermal contact with each other on the one hand and with a fluid playing the part of a cold source on the other hand.
Description
HEAT EXCHANGE SYSTEM IN A TIIRBOMACHINL
Subject of the invention [0001] The present invention relates to the field of heat exchangers, preferably those intended for cooling oil, for the lubrication system of an aircraft engine, in particular a turbomachine.
State of the art
Subject of the invention [0001] The present invention relates to the field of heat exchangers, preferably those intended for cooling oil, for the lubrication system of an aircraft engine, in particular a turbomachine.
State of the art
[0002] In a turbomachine, various units and equipment must be lubricated and/or cooled, the heat generated being usually carried by oil systems and extracted by fuel/oil and/or air/oil exchangers. With each unit or piece of equipment having its own specifications regarding the lubrication, several oil systems may coexist with their own structures, pressures, temperatures etc. In the context of the current trend to "more electric" in turbomachines, one might for example have a lubrication system for the starter-generator (S/G) which is distinct from the oil system for the engine's bearing chambers.
Where necessary, the calories generated in these two systems must therefore be taken up by the oil which acts as a liquid lubricant but also as a coolant fluid, in the context of current engine development. The oil requirements must therefore be increased in this situation. Traditionally, according to the state of the art, the lubrication and cooling circuits of electrical equipment (S/Gs) are separate from the turbomachine circuit, each having its own circulation system, which is generally based on volumetric pumps, and its own cooling system such as an air/oil and/or fuel/oil exchanger ("radiator").
Where necessary, the calories generated in these two systems must therefore be taken up by the oil which acts as a liquid lubricant but also as a coolant fluid, in the context of current engine development. The oil requirements must therefore be increased in this situation. Traditionally, according to the state of the art, the lubrication and cooling circuits of electrical equipment (S/Gs) are separate from the turbomachine circuit, each having its own circulation system, which is generally based on volumetric pumps, and its own cooling system such as an air/oil and/or fuel/oil exchanger ("radiator").
[0003] The heat exchanger for each circuit is sized for its critical point in the flight which depends on the profile of heat generation of the machine to be cooled and on the availability of the cold source as well as the possible use of another cold source.
[0004] This therefore entails the following negative effects:
- Oversizing of the equipment for all the other cases, hence the considerable weight of the equipment;
- Oversizing of the equipment for all the other cases, hence a useless disturbance of the airflow and more generally a loss of output by the turbomachine, in the case of an exchange with air;
- Overcooling of the oil in all the other cases, which requires additional control equipment.
- Oversizing of the equipment for all the other cases, hence the considerable weight of the equipment;
- Oversizing of the equipment for all the other cases, hence a useless disturbance of the airflow and more generally a loss of output by the turbomachine, in the case of an exchange with air;
- Overcooling of the oil in all the other cases, which requires additional control equipment.
[0005] The sizing parameters being different for the two present circuits, the sizing points of the exchanger of each circuit are thus also different.
[0006] Document GB-A-2 052 722 discloses a multiple fluid heat exchanger, for use as a radiator for the coolant system of an internal combustion engine in automotive vehicles, comprising a first liquid-to-liquid cooler of the stacked plate type (e.g. water/motor oil cooler) and a second liquid-to-liquid cooler of the stacked plate type (e.g. water/transmission oil cooler).
The two liquid-to-liquid coolers are separated by a baffle preventing thermal exchange between them. Thus the coolant (water) is used to separately cool at least two hot fluids (e.g. motor oil and transmission oil), successively or in parallel. Corrugated heat exchange fins may be provided in the coolant passage so that to cool the coolant further, e.g. with air.
Aims of the invention
The two liquid-to-liquid coolers are separated by a baffle preventing thermal exchange between them. Thus the coolant (water) is used to separately cool at least two hot fluids (e.g. motor oil and transmission oil), successively or in parallel. Corrugated heat exchange fins may be provided in the coolant passage so that to cool the coolant further, e.g. with air.
Aims of the invention
[0007] The present invention aims to provide a solution which will allow the disadvantages of the state of the art to be overcome.
5[0008] In particular, the invention aims to propose a cooling system which avoids any oversizing of the individual heat exchangers associated with two or more cooling structures in a turbomachine.
[0009] In particular, the invention also aims to reduce the weight of this equipment as well as the useless intake of air.
[0010] The invention also aims to eliminate the need for supplementary control equipment by means of the simplification of the cooling system.
Main characteristic elements of the invention [0011] A first subject of the present invention relates to a heat exchange system in a turbomachine comprising a number of units and equipment to be cooled and/or lubricated, said system comprising at least two distinct oil circuits for cooling and/or lubricating said equipment, characterised in that said system is configured to put said oil circuits in thermal contact with each other on the one hand and with a fluid playing the part of a cold source on the other hand.
[0012] According to a preferred embodiment of the invention, the exchanger comprises a fluid/oil exchange element which is common to both oil circuits.
[0013] Said common exchange element preferably comprises a plate incorporating each of said oil circuits and which exchanges heat with the fluid of one single external side of the plate or both.
[0014] As a further preference, the external side or sides of the plate used for the heat exchange between the oil circuits and said fluid, is/are in the form of, equipped with or surmounted by fins.
[0015] According to a first preferred embodiment, the common exchange element is of a surface type, that is, it consists of a single plate designed to be incorporated along an existing surface.
[0016] According to a second preferred embodiment, the exchange element common to the two oil circuits is of a "sandwich" type, that is, comprising a stack of several plates containing the individual oil circuits separated by fins between which the fluid circulates.
[0017] According to these embodiments, the circuits are preferably entangled in each plate.
[0018] As a further alternative, the plate is separated into two parts by a partition where the fluid circulates and where its nature and thickness are selected so as to regulate the thermal interaction.
[0019] The partition is preferably equipped with fins.
[0020] As an advantage, the heat exchanger fluid is the external air or a fuel.
[0021] According to an alternative embodiment of the invention, the heat exchange system contains a fluid/oil exchange element which is common to both oil circuits, comprising one or more tube(s) and a chamber.
[0022] According to a first embodiment, at least one first tube comprises the first oil circuit and at least a second tube comprises the second oil circuit, all the tubes soaking in the fluid playing the part of the cold source and circulating in the chamber. In this case, the latter is the air or, preferably, the engine's fuel.
[0023] According to a second embodiment, the tube or tubes on the one hand carry the fluid and on the other hand soak in the chamber, a first compartment of which is i . . . . . . . . . . . . .
a part of the first oil circuit and a second compartment is a part of the second oil circuit.
[0024] Still according to the invention, as an advantage, each individual oil circuit also comprises, as well as the common exchange element, its own means of heat exchange.
[0025] As an advantage, the common exchange element may be located either upstream or downstream from said means of heat exchange relative to the units and equipment to be cooled and/or lubricated.
[0026] A second subject of the present invention relates to a lubrication and/or cooling system for a turbomachine comprising a heat exchange system according to the features mentioned above.
[0027] As an advantage, the first lubrication circuit feeds the engine circuit of the turbomachine and the second lubrication circuit feeds an electric starter-generator (S/G).
[00281 A third subject of the present invention relates to a turbomachine comprising the above-mentioned lubrication and/or cooling system.
Brief description of the diagrams [00291 Diagram 1 shows a schematic view of an air/oil heat exchanger 4 which is common to two cooling systems 2,3, that of the engine itself and that of the S/G, in a turbomachine, according to the present invention.
[0030] Diagram 2 shows a schematic view of a first preferred embodiment of the present invention where two oil circuits are arranged in a plate which exchanges heat with the ambient air or the fuel.
[0031] Diagram 3 shows a schematic view of a second preferred embodiment of the present invention where two oil circuits are arranged in a plate which exchanges heat with the ambient air or the fuel.
[0032] Diagram 4 shows a third preferred embodiment of the present invention, where the exchange plate is divided into two parts, the thermal interaction being regulated by the nature and thickness of the separation between the two sections.
[0033] Diagrams 5A and 5B show alternative embodiments of the invention, where the heat exchanger comprises a fluid/oil exchange element of the "tubes and chamber" type.
Description of a preferred embodiment of the invention [0034] The invention consists in combining the functions of heat (or "calorie") extraction of two or more systems or oil circuits 2,3 in a turbomachine into a single, common heat exchanger 4. The sizing of the exchangers of the two circuits 2,3 being in principle made for different flight situations, the use of a common equipment 4 to perform both functions allows to reduce the oversizing as well as its disadvantages in all other flight situations.
[0035] This equipment is primarily used for cooling the two oils whilst generating a thermal interaction with a beneficial effect between the two systems. It does not have to be the only means of extracting the heat for the two oil circuits 2,3, which may each contain its own individual means of cooling 2A,3A (see Diagram 1).
[0036] The design will be developed according to the degree of interaction desired between the thermal behaviour of the two oil systems. The overall cooling of both oil systems is ensured by the air or by fuel and the interaction between the two oils allows to regulate their temperatures across all engine speeds, wherein an oil can be used to provide either supplementary cooling or heating (in the case of an overcooled oil) to the other oil. There is therefore a self-regulation between the two oils by means of a passive component (common radiator), where the respective roles of the two oils can be reversed from one engine speed to another.
[0037] The solution proposed according to a first preferred embodiment of the invention may be implemented either in an exchange element or surface ACOC (stands for Air Cooled Oil Cooler) 4, comprising a single plate 5 with an oil circuit exchanging heat with the air of one single external side or both, the latter being preferably equipped with fins 6, or in an ACOC of an either "sandwich" or "plates and fins" type, comprising a stack of plates 5 with oil circuits separated by fins 6 where the air (not shown) circulates. The arrangement of the two oil circuits into each plate will depend on the degree of thermal interaction desired between the two oils.
[0038] According to another preferred embodiment, the two circuits will be more or less heavily entangled in a single plate (see Diagrams 2 and 3). According to yet another preferred embodiment, one or more of the plates 5, shown in Diagrams 2 and 3, will be separated into two parts 5A, 5B, the thermal interaction between the two respective oils being regulated by the nature and thickness of a separating partition 7, which is preferably equipped with fins 6 (see Diagram 4).
[0039] Alternative embodiments of the invention are shown in Diagrams 5A and 5B respectively (exchanger of the "tubes and chamber" type). In Diagram 5A, the first oil circuit 2 and the second oil circuit 3 have the form of tubes soaked in a chamber 8, in which the fluid that plays the part of the cold source circulates. Said fluid is preferably the engine's fuel. In Diagram 5B, the tube or tubes 9 carry the fluid (fuel) and soak in a chamber comprising on the one hand a compartment being a part of the first oil circuit 2 and on the other hand a compartment being a part of the second oil circuit 3, both isolated from each other. The multi-fluid heat exchanger proposed in document GB A-2 052 722 combines several classical exchangers next to each other. There is for example a first coolant fluid/hot fluid exchanger A
followed by a second coolant fluid/hot fluid exchanger B.
Unlike the present invention, the oil circuits are not entangled, which means they cannot exchange heat between each other. The two hot fluids are systematically cooled one after the other or one at the same time as the other by the coolant fluid.
Advantages of the invention - Combination of the cooling of the two different oils in a single ACOC element, allowing to avoid the presence of two cooling structures and therefore to save weight and bulk, in particular with regard to the fixings and connections;
- Possible control of the thermal interaction between the two lubrication circuits through the design of the exchanger. By using a first oil to cool the second oil when the engine is running, the need for interaction with the airflow is reduced, as is therefore possibly the disturbance of the airflow. This solution also allows to avoid a possible overcooling at high engine speed, the overcooled oil taking calories from the hotter oil;
- Output of the heat exchange between two hydraulic fluids better than that of oil/air exchange (in the case of an
5[0008] In particular, the invention aims to propose a cooling system which avoids any oversizing of the individual heat exchangers associated with two or more cooling structures in a turbomachine.
[0009] In particular, the invention also aims to reduce the weight of this equipment as well as the useless intake of air.
[0010] The invention also aims to eliminate the need for supplementary control equipment by means of the simplification of the cooling system.
Main characteristic elements of the invention [0011] A first subject of the present invention relates to a heat exchange system in a turbomachine comprising a number of units and equipment to be cooled and/or lubricated, said system comprising at least two distinct oil circuits for cooling and/or lubricating said equipment, characterised in that said system is configured to put said oil circuits in thermal contact with each other on the one hand and with a fluid playing the part of a cold source on the other hand.
[0012] According to a preferred embodiment of the invention, the exchanger comprises a fluid/oil exchange element which is common to both oil circuits.
[0013] Said common exchange element preferably comprises a plate incorporating each of said oil circuits and which exchanges heat with the fluid of one single external side of the plate or both.
[0014] As a further preference, the external side or sides of the plate used for the heat exchange between the oil circuits and said fluid, is/are in the form of, equipped with or surmounted by fins.
[0015] According to a first preferred embodiment, the common exchange element is of a surface type, that is, it consists of a single plate designed to be incorporated along an existing surface.
[0016] According to a second preferred embodiment, the exchange element common to the two oil circuits is of a "sandwich" type, that is, comprising a stack of several plates containing the individual oil circuits separated by fins between which the fluid circulates.
[0017] According to these embodiments, the circuits are preferably entangled in each plate.
[0018] As a further alternative, the plate is separated into two parts by a partition where the fluid circulates and where its nature and thickness are selected so as to regulate the thermal interaction.
[0019] The partition is preferably equipped with fins.
[0020] As an advantage, the heat exchanger fluid is the external air or a fuel.
[0021] According to an alternative embodiment of the invention, the heat exchange system contains a fluid/oil exchange element which is common to both oil circuits, comprising one or more tube(s) and a chamber.
[0022] According to a first embodiment, at least one first tube comprises the first oil circuit and at least a second tube comprises the second oil circuit, all the tubes soaking in the fluid playing the part of the cold source and circulating in the chamber. In this case, the latter is the air or, preferably, the engine's fuel.
[0023] According to a second embodiment, the tube or tubes on the one hand carry the fluid and on the other hand soak in the chamber, a first compartment of which is i . . . . . . . . . . . . .
a part of the first oil circuit and a second compartment is a part of the second oil circuit.
[0024] Still according to the invention, as an advantage, each individual oil circuit also comprises, as well as the common exchange element, its own means of heat exchange.
[0025] As an advantage, the common exchange element may be located either upstream or downstream from said means of heat exchange relative to the units and equipment to be cooled and/or lubricated.
[0026] A second subject of the present invention relates to a lubrication and/or cooling system for a turbomachine comprising a heat exchange system according to the features mentioned above.
[0027] As an advantage, the first lubrication circuit feeds the engine circuit of the turbomachine and the second lubrication circuit feeds an electric starter-generator (S/G).
[00281 A third subject of the present invention relates to a turbomachine comprising the above-mentioned lubrication and/or cooling system.
Brief description of the diagrams [00291 Diagram 1 shows a schematic view of an air/oil heat exchanger 4 which is common to two cooling systems 2,3, that of the engine itself and that of the S/G, in a turbomachine, according to the present invention.
[0030] Diagram 2 shows a schematic view of a first preferred embodiment of the present invention where two oil circuits are arranged in a plate which exchanges heat with the ambient air or the fuel.
[0031] Diagram 3 shows a schematic view of a second preferred embodiment of the present invention where two oil circuits are arranged in a plate which exchanges heat with the ambient air or the fuel.
[0032] Diagram 4 shows a third preferred embodiment of the present invention, where the exchange plate is divided into two parts, the thermal interaction being regulated by the nature and thickness of the separation between the two sections.
[0033] Diagrams 5A and 5B show alternative embodiments of the invention, where the heat exchanger comprises a fluid/oil exchange element of the "tubes and chamber" type.
Description of a preferred embodiment of the invention [0034] The invention consists in combining the functions of heat (or "calorie") extraction of two or more systems or oil circuits 2,3 in a turbomachine into a single, common heat exchanger 4. The sizing of the exchangers of the two circuits 2,3 being in principle made for different flight situations, the use of a common equipment 4 to perform both functions allows to reduce the oversizing as well as its disadvantages in all other flight situations.
[0035] This equipment is primarily used for cooling the two oils whilst generating a thermal interaction with a beneficial effect between the two systems. It does not have to be the only means of extracting the heat for the two oil circuits 2,3, which may each contain its own individual means of cooling 2A,3A (see Diagram 1).
[0036] The design will be developed according to the degree of interaction desired between the thermal behaviour of the two oil systems. The overall cooling of both oil systems is ensured by the air or by fuel and the interaction between the two oils allows to regulate their temperatures across all engine speeds, wherein an oil can be used to provide either supplementary cooling or heating (in the case of an overcooled oil) to the other oil. There is therefore a self-regulation between the two oils by means of a passive component (common radiator), where the respective roles of the two oils can be reversed from one engine speed to another.
[0037] The solution proposed according to a first preferred embodiment of the invention may be implemented either in an exchange element or surface ACOC (stands for Air Cooled Oil Cooler) 4, comprising a single plate 5 with an oil circuit exchanging heat with the air of one single external side or both, the latter being preferably equipped with fins 6, or in an ACOC of an either "sandwich" or "plates and fins" type, comprising a stack of plates 5 with oil circuits separated by fins 6 where the air (not shown) circulates. The arrangement of the two oil circuits into each plate will depend on the degree of thermal interaction desired between the two oils.
[0038] According to another preferred embodiment, the two circuits will be more or less heavily entangled in a single plate (see Diagrams 2 and 3). According to yet another preferred embodiment, one or more of the plates 5, shown in Diagrams 2 and 3, will be separated into two parts 5A, 5B, the thermal interaction between the two respective oils being regulated by the nature and thickness of a separating partition 7, which is preferably equipped with fins 6 (see Diagram 4).
[0039] Alternative embodiments of the invention are shown in Diagrams 5A and 5B respectively (exchanger of the "tubes and chamber" type). In Diagram 5A, the first oil circuit 2 and the second oil circuit 3 have the form of tubes soaked in a chamber 8, in which the fluid that plays the part of the cold source circulates. Said fluid is preferably the engine's fuel. In Diagram 5B, the tube or tubes 9 carry the fluid (fuel) and soak in a chamber comprising on the one hand a compartment being a part of the first oil circuit 2 and on the other hand a compartment being a part of the second oil circuit 3, both isolated from each other. The multi-fluid heat exchanger proposed in document GB A-2 052 722 combines several classical exchangers next to each other. There is for example a first coolant fluid/hot fluid exchanger A
followed by a second coolant fluid/hot fluid exchanger B.
Unlike the present invention, the oil circuits are not entangled, which means they cannot exchange heat between each other. The two hot fluids are systematically cooled one after the other or one at the same time as the other by the coolant fluid.
Advantages of the invention - Combination of the cooling of the two different oils in a single ACOC element, allowing to avoid the presence of two cooling structures and therefore to save weight and bulk, in particular with regard to the fixings and connections;
- Possible control of the thermal interaction between the two lubrication circuits through the design of the exchanger. By using a first oil to cool the second oil when the engine is running, the need for interaction with the airflow is reduced, as is therefore possibly the disturbance of the airflow. This solution also allows to avoid a possible overcooling at high engine speed, the overcooled oil taking calories from the hotter oil;
- Output of the heat exchange between two hydraulic fluids better than that of oil/air exchange (in the case of an
- 8 -ACOC), even if ultimately the overall exchange will be made with the external air.
- 9 -
Claims (19)
1. Heat exchange system in a turbomachine comprising a number of units and equipment (10,20) to be cooled and/or lubricated, said system containing at least two distinct oil circuits (2,3) for cooling and/or lubricating said equipment (10,20), characterised in that said system is configured to put said at least two distinct oil circuits (2,3) in close thermal contact with each other on the one hand and with a fluid playing the part of a cold source on the other hand.
2. Heat exchange system as in Claim 1, characterised in that it comprises a fluid/oil exchange element (4), common to said at least two distinct oil circuits (2,3).
3. Heat exchange system as in Claim 2, characterised in that said common exchange element (4) comprises a plate (5) which incorporates each of said oil circuits (2,3) and which exchanges heat with the fluid of one single external side of the plate (5) or both.
4. System of heat exchange as in Claim 3, characterised in that the external side(s) of the plate (5), used for the heat exchange between the oil circuits (2,3) and said fluid, is/are in the form of, equipped with or surmounted with fins (6).
5. Heat exchange system as in Claim 3 or Claim 4, characterised in that the common exchange element (4) is of a surface type, which means it comprises a single plate designed to be incorporated along an existing surface.
6. Heat exchange system as in Claim 3 or Claim 4, characterised in that the common exchange element (4) is of a "sandwich" type, which means it comprises a stack of several plates (5) containing the individual oil circuits (2,3) separated by fins (6) between which said fluid circulates.
7. Heat exchange system as in any one of Claims 3 to 6, characterised in that the oil circuits (2,3) are entangled in said plate (5).
8. Heat exchange system as in any of Claims 3 to 7, characterised in that said plate (5) is separated into two parts (5A,5B) by a partition (7) where said fluid circulates and whose nature and thickness are selected to regulate the thermal interaction.
9. Heat exchange system as in Claim 8, characterised in that the partition (7) is equipped with fins (6).
10. Heat exchange system as in any one of claims 1 to 9, characterised in that the heat exchanger fluid is the external air or a fuel.
11. Heat exchange system as in Claim 1, characterised in that it contains a fluid/oil exchange element (4), which is common to both oil circuits (2,3), comprising one or more tube(s) and a chamber.
12. Heat exchange system as in Claim 11, characterised in that at least a first tube comprises the first oil circuit (2) and at least a second tube comprises the second oil circuit (3), all the tubes soaking in the fluid playing the part of the cold source and circulating in the chamber (8).
13. Heat exchange system as in Claim 12, characterised in that the fluid playing the part of the cold source is the external air or the engine's fuel.
14. Heat exchange system as in Claim 11, characterised in that the tube(s) (9) carry the fluid on the one hand and soak in the partition on the other hand, a first compartment of which is a part of the first oil circuit (2) and a second compartment is a part of the second oil circuit (3).
15. Heat exchange system as in any one of claims 1 to 14, characterised in that each individual oil circuit (2,3) comprises, besides the common exchange element (4), a means of heat exchange of its own (2A, 3A).
16. Heat exchange system as in Claim 15, characterised in that the common exchange element (4) may be located either upstream or downstream from its own means of heat exchange (2A, 3A) relative to the units and equipment to be cooled and/or lubricated.
17. Lubrication and/or cooling system for a turbomachine comprising a heat exchange system as in any one of Claims 1 to 16.
18. Lubrication and/or cooling system as in Claim 17, characterised in that a first of said at least two oil circuits feeds an engine circuit of the turbomachine and a second of said at least two oil circuits feeds an electric starter-generator (S/G).
19. Turbine engine comprising a lubrication system as in Claim 18.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07447069.1 | 2007-12-21 | ||
| EP07447069.1A EP2072763B1 (en) | 2007-12-21 | 2007-12-21 | Heat exchange system in a turbomachine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2647570A1 CA2647570A1 (en) | 2009-06-21 |
| CA2647570C true CA2647570C (en) | 2016-02-02 |
Family
ID=39619043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2647570A Expired - Fee Related CA2647570C (en) | 2007-12-21 | 2008-12-22 | Heat exchange system in a turbomachine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20090159246A1 (en) |
| EP (1) | EP2072763B1 (en) |
| CA (1) | CA2647570C (en) |
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| FR2993607B1 (en) * | 2012-07-20 | 2014-08-22 | Snecma | THERMAL TRANSFER DEVICE BETWEEN A LUBRICATION CHANNEL AND A TURBOMACHINE BLADE SETTING CYLINDER CONTROL HYDRAULIC PIPE |
| US9435261B2 (en) * | 2012-10-05 | 2016-09-06 | Sikorsky Aircraft Corporation | Redundant cooling for fluid cooled systems |
| EP2995788B1 (en) | 2014-09-12 | 2019-06-26 | Rolls-Royce Corporation | Fuel cooled cyclonic air oil separator |
| US10578020B2 (en) | 2015-07-21 | 2020-03-03 | Unison Industries, Llc | Integral oil tank heat exchanger |
| US10253726B2 (en) | 2015-08-07 | 2019-04-09 | Pratt & Whitney Canada Corp. | Engine assembly with combined engine and cooling exhaust |
| US10240522B2 (en) | 2015-08-07 | 2019-03-26 | Pratt & Whitney Canada Corp. | Auxiliary power unit with combined cooling of generator |
| US10697371B2 (en) | 2015-12-28 | 2020-06-30 | General Electric Company | Method and system for a combined air-oil cooler and fuel-oil cooler heat exchanger |
| US10612860B2 (en) | 2016-05-23 | 2020-04-07 | Hamilton Sunstrand Corporation | Multiple flow heat exchanger |
| SG11201811473WA (en) * | 2016-07-11 | 2019-01-30 | Nat Univ Singapore | A multi-fluid heat exchanger |
| EP3336320B1 (en) * | 2016-12-14 | 2020-08-12 | Airbus Operations, S.L. | Oil heating system adapted for turbine engine to reduce starting torque |
| CN107246288B (en) * | 2017-06-16 | 2019-03-05 | 华中科技大学 | A kind of turbine, condenser and the three-in-one energy utilization device of water circulating pump |
| GB201803316D0 (en) * | 2018-03-01 | 2018-04-18 | Rolls Royce Plc | Heat exchanger |
| BE1026603B1 (en) * | 2018-09-11 | 2020-04-09 | Safran Aero Boosters Sa | MULTI-FLUID HEAT EXCHANGER MATRIX |
| EP3726028A1 (en) * | 2019-04-17 | 2020-10-21 | United Technologies Corporation | Multiple stream heat exchanger |
| EP3730763B1 (en) * | 2019-04-17 | 2023-02-15 | Raytheon Technologies Corporation | Dynamic thermal load monitoring and mitigation for aircraft systems |
| WO2020249599A1 (en) * | 2019-06-14 | 2020-12-17 | Rolls-Royce Deutschland Ltd & Co Kg | Gas turbine engine and heat management system for cooling oil in an oil system of a gas turbine engine |
| CN113783361B (en) * | 2020-06-09 | 2022-11-29 | 北京金风科创风电设备有限公司 | Cooling system |
| US20240159186A1 (en) * | 2022-11-14 | 2024-05-16 | Pratt & Whitney Canada Corp. | Lubricant reservoir with integrated heat exchanger |
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| JP2686123B2 (en) * | 1988-12-27 | 1997-12-08 | 三洋電機株式会社 | Heat exchange equipment |
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-
2007
- 2007-12-21 EP EP07447069.1A patent/EP2072763B1/en active Active
-
2008
- 2008-12-18 US US12/338,257 patent/US20090159246A1/en not_active Abandoned
- 2008-12-22 CA CA2647570A patent/CA2647570C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US20090159246A1 (en) | 2009-06-25 |
| EP2072763A1 (en) | 2009-06-24 |
| CA2647570A1 (en) | 2009-06-21 |
| EP2072763B1 (en) | 2015-04-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20131023 |
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| MKLA | Lapsed |
Effective date: 20201222 |