WO2025003590A1 - Système de lubrification/refroidissement pour aéronef et enceinte hydraulique - Google Patents
Système de lubrification/refroidissement pour aéronef et enceinte hydraulique Download PDFInfo
- Publication number
- WO2025003590A1 WO2025003590A1 PCT/FR2024/050758 FR2024050758W WO2025003590A1 WO 2025003590 A1 WO2025003590 A1 WO 2025003590A1 FR 2024050758 W FR2024050758 W FR 2024050758W WO 2025003590 A1 WO2025003590 A1 WO 2025003590A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lubricating
- circuit
- cooling fluid
- inlet
- cooling
- 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.)
- Ceased
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
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K5/00—Plants including an engine, other than a gas turbine, driving a compressor or a ducted fan
-
- 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
- the invention relates to lubrication/cooling devices for aircraft and more particularly to lubrication/cooling systems intended for the lubrication and cooling of turbomachines provided with an electric generator.
- climate change is a major concern for many legislative and regulatory bodies around the world. Indeed, various restrictions on carbon emissions have been, are being or will be adopted by various states. In particular, an ambitious standard applies both to new types of aircraft as well as those in circulation requiring the implementation of technological solutions in order to make them compliant with current regulations. Civil aviation has been mobilizing for several years now to make a contribution to the fight against climate change.
- the invention is the result of technological research aimed at significantly improving the performance of aircraft and, in this sense, contributes to reducing the environmental impact of aircraft.
- conventional propulsion architectures of the turboshaft or turboprop type typically include two mechanical systems, namely the gas turbine and the power reducer. These two systems have technically different limitations concerning the operating temperatures of their respective lubrication circuits.
- the gas turbine alone contains only bearings and a chain of pinions driving the accessories necessary for its operation (typically: oil pump, fuel pump, FADEC alternator, starter generator, centrifugal oil separator): this assembly can operate with a first lubrication/cooling circuit whose oil temperatures are of the order of one hundred and thirty to one hundred and forty degrees centigrade at the inlet and up to one hundred and eighty degrees centigrade at the outlet.
- the power reducer operates with a second lubrication/cooling circuit whose oil temperatures are around one hundred and ten to one hundred and twenty degrees centigrade at the inlet and around one hundred and sixty degrees centigrade at the outlet.
- the oil pumped out of the two lubrication/cooling circuits is directed to an oil/air heat exchanger to be cooled before being discharged into a tank where it will be pumped again to supply the lubrication/cooling circuits.
- the two lubrication/cooling circuits have different supply and outlet temperatures, it is generally accepted to have only one oil-air type exchanger, because the oversizing generated remains acceptable. This is typically the case on helicopter turboshaft engines.
- a second cooling system of the oil-fuel heat exchanger type can be added in order to ensure supercooling of part of the lubrication/cooling circuit of the reducer.
- a third subsystem which is an electric machine composed of power electronics and an electric motor/generator.
- This third system requires a third lubrication/cooling circuit whose oil temperatures are of the order of sixty to ninety degrees centigrade at the inlet and which then requires a dedicated heat exchanger due to the inlet and outlet temperatures being much lower than those of the other two circuits.
- Such an exchanger represents an additional cost and excess weight which negatively impacts the aircraft's performance in terms of fuel consumption.
- a lubrication/cooling system for an aircraft turbomachine comprising: a first circuit for circulating a lubricating and/or cooling fluid intended to be connected to a first lubrication and/or cooling inlet and outlet of a gas turbine; a second circuit for circulating the lubricating and/or cooling fluid intended to be connected to a second lubrication and/or cooling inlet and outlet of a mechanical reducer; a third circuit for circulating the lubricating and/or cooling fluid intended to be connected to a third lubrication and/or cooling inlet and outlet of an electric machine; a fourth circuit for circulating the lubricating and/or cooling fluid intended to be connected to a fourth lubrication and/or cooling inlet and outlet of a power electronics module of the electric machine; a first pump for circulating the lubricating and/or cooling fluid comprising a first port for sucking the lubricating and/or cooling fluid and a first port for discharging the lubricating and
- the lubrication/cooling system comprises a third pump for circulating the lubrication and/or cooling fluid comprising a third suction port for the lubrication and/or cooling fluid and a third discharge port for the lubrication and/or cooling fluid, the third pump being located in the fourth circuit or between the fifth outlet and the seventh inlet;
- the first heat exchanger is a fluid/air exchanger whose first cold source is air and the first circuit comprises a second heat exchanger whose second cold source is a fuel circuit of the turbomachine;
- the second circuit comprises a third heat exchanger whose third cold source is a fuel circuit of the turbomachine and/or the third circuit comprises a fourth heat exchanger whose fourth cold source is a fuel circuit of the turbomachine;
- the first circuit and/or the second circuit and/or the third circuit comprises a device for filtering the lubricating and/or cooling fluid;
- the first pump and/or the second pump and/or the third pump are connected to mechanical power take
- the invention also relates to a turbomachine comprising a lubrication/cooling system as described above and an aircraft comprising such a turbomachine.
- Figure 1 is a schematic sectional view of a turbomachine
- FIG.2 Figure 2 is a schematic view of a lubrication/cooling circuit according to a first embodiment of the invention
- Figure 3 is a schematic view of a lubrication/cooling circuit according to a second embodiment of the invention
- Figure 4 is a schematic view of a lubrication/cooling circuit according to a third embodiment of the invention.
- Figure 5 is a schematic detail view of a fourth embodiment of the invention.
- a turbomachine here a turboprop engine marked 1 in FIG. 1 and which equips an aircraft not shown
- the air is admitted into an inlet sleeve 2 after having passed through a propulsive propeller 3 comprising a series of rotating blades to then be compressed by compressor stages 4 before reaching a combustion chamber 5 in which fuel is injected and then burned.
- the pressurized gas flow generated in the combustion chamber 5 expands by passing through turbine stages 6, before being evacuated to the exhaust
- the blades of the compressor stages 4 and the turbine stages 6 are rotationally integral with a shaft 7 rotatably mounted relative to a casing 8 surrounding the compressor stages 4, the combustion chamber 5, the turbine stages 6, the casing 8 defining an exhaust outlet.
- the inlet sleeve 2, the compressor stages 4, the combustion chamber 5, the turbine stages 6 and the casing 8 define a gas turbine 9.
- the shaft 7 of the gas turbine 9 is connected by a mechanical reducer 10 to a drive shaft 3.1 of the propeller 3.
- the reducer 10 is also provided with an output shaft 11 connected to an electric machine comprising an electric motor/generator 12 controlled by a power electronics module 12.1.
- the connection of the motor/generator 12 to the reducer 10 allows the motor/generator 12 to generate electricity during operation of the turboprop 1 in 100% thermal mode, to drive the propeller 3 in 100% electric mode and to assist the turbine 9 in driving the propeller 3 in hybrid mode.
- upstream and downstream are used in reference to the position or orientation of an element according to the direction of flow of the fluid in the pipes.
- the aircraft is equipped with a lubrication/cooling system 100 comprising a first circuit 20 for circulating a lubricating and/or cooling fluid—here oil 13—, a second circuit 30 for circulating oil 13, a third circuit 40 for circulating oil 13 and a fourth circuit 150 for circulating oil 13.
- a lubrication/cooling system 100 comprising a first circuit 20 for circulating a lubricating and/or cooling fluid—here oil 13—, a second circuit 30 for circulating oil 13, a third circuit 40 for circulating oil 13 and a fourth circuit 150 for circulating oil 13.
- the circuit 20 is connected to a first inlet 14 of the turbine 9 by a first supply pipe 21 and to a first outlet 15 of the turbine 9 by a first drainage pipe 22.
- the circuit 30 is connected to a second inlet 16 of the reducer 10 by a second supply line 31 and to a second outlet 17 of the reducer 10 by a second drainage line 32.
- the circuit 40 is connected to a third input 18 of the motor/generator 12 by a third supply line 41 and to a third output 19 of the motor/generator 12 by a third drainage line 42.
- the circuit 150 is connected to a fourth input 12.2 of the module 12.1 by a fourth supply line 151 and to a fourth output 12.3 of the module 12.1 by a fourth drainage line 152.
- a first pump 50 for circulating the oil 13 comprises a first suction port 51 for oil 13 and a first discharge port 52 for oil 13.
- a second oil 13 circulation pump 60 comprises a second oil 13 suction port 61 and a second oil 13 discharge port 62.
- a third oil 13 circulation pump 160 includes a third oil 13 suction port 161 and a third oil 13 discharge port 162.
- the system 100 also comprises a hydraulic enclosure 110 which forms a set of reservoirs comprising a first reservoir 70 and a second reservoir 80 and which are combined in the same interior volume 111 of the hydraulic enclosure 110.
- the enclosure hydraulic 110 is defined by a wall 120 and the tanks 70 and 80 are separated by a partition 112 extending into the interior volume 111.
- the partition 112 is a double-skin partition comprising a first skin 113 and a second skin 114 separated by a thermal insulator 115-.
- the first tank 70 comprises a first deaeration volume 71 supplied by a fifth inlet 72 of oil 13 as well as a first supply volume 73 connected to a fifth outlet 74 of oil 13.
- a second tank 80 comprises a second deaeration volume 81 supplied by a sixth inlet 82 of oil 13 as well as a second supply volume 83 connected to a sixth outlet 84 of oil 13.
- a first fluid/air heat exchanger 90 comprises a seventh inlet 91 for oil 13 and a seventh outlet 92 for oil 13.
- the first cold source of the exchanger 90 is air coming from the immediate environment of the aircraft.
- the circuit 20 connects the first discharge port 52 and the fifth inlet 72 via a connection from the upstream end 21.1 of the pipe 21 to the first discharge port 52 and a connection from the downstream end 22.1 of the pipe 22 to the fifth inlet 72.
- the second circuit 30 connects the second discharge port 62 and the fifth inlet 72 via a connection from the upstream end 31.1 of the pipe 31 to the second discharge port 62 and a connection from the downstream end 32.1 of the pipe 32 to the fifth inlet 72.
- the third circuit 40 connects the second discharge port 62 and the fifth inlet 72 via a connection from the upstream end 41.1 of the pipe 41 to the second discharge port 62. discharge 62 and a connection from the downstream end 32.1 of the pipe 42 to the fifth inlet 72.
- the fourth circuit 150 connects the seventh outlet 92 and the sixth inlet 82 via a connection from the upstream end 151.1 of the conduit 151 to the seventh outlet port 92 and a connection from the downstream end 152.1 of the conduit 152 to the sixth inlet 82.
- the fifth outlet 74 is fluidically connected to the third suction port 161 by a fourth suction line 165.
- the sixth outlet 84 is fluidically connected to the first suction port 51 by a fifth suction line 55 and to the second suction port 61 by a sixth suction line 65.
- the seventh inlet 91 is fluidically connected to the third discharge port 162 by a fourth discharge pipe 166.
- the pump 50 is connected to the gas turbine 9 by a first transmission shaft 53 - shown in dotted lines - so as to be actuated during all phases of operation of the gas turbine 9.
- the pump 60 and the pump 160 are respectively connected to the propeller 3 by a second transmission shaft 63 and a third transmission shaft 163 so as to be actuated during all phases of operation of the propeller 3, whether the propeller 3 is driven by the turbine 9, by the engine/generator 12 or by other means such as the circulation of air through the propeller in a wind turbine mode also known as RAT mode for "Ram Air Turbine".
- the shafts 63 and 163 constitute direct mechanical connections between the propeller and the pump.
- the gas turbine 9 drives the propeller 3 via the reducer 10.
- the pump 160 the actuation of which is linked to a rotation of the propeller 3, transfers the hot and deaerated oil 13 from the supply volume 73 of the hot tank 70 to the heat exchanger 90, the oil 13 thus cooled passes through the module 12.1 and is discharged into the deaeration volume 81 of the cold tank 80.
- the pump 50 the actuation of which is linked to the operation of the gas turbine 9, transfers the deaerated oil 13 from the supply volume 83 to the turbine 9.
- the pump 60 transfers, for its part, the deaerated oil 13 from the supply volume 83 to the reducer 10, the oil 13 is then recovered at the outlet of the turbine 9 and the reducer 10 to be discharged into the deaeration volume 71 of the tank 70.
- Turbine 9 provides all of the motive power and motor/generator 12 produces electricity.
- the vent 116 is arranged to maintain identical oil levels in the volumes 83 and 73 according to the principle of “communicating vessels”. Thus, during the operating phases of the turbomachine 1 in which the cumulative flow rates of the pumps 50 and 60 are different from the flow rate of the pump 160, the vent 116 makes it possible to compensate for the difference in flow rates.
- the hybrid operating mode (driving the propulsive propeller 3 by both the engine/generator 12 and the gas turbine 9) is similar to the thermal operating mode with regard to the driving of the pumps 50, 60 and 160.
- the motor/generator 12 that drives the propeller 3 via the reduction gear 10 and the gas turbine 9 is stopped.
- the pump 160 the actuation of which is linked to a rotation of the propeller 3, transfers the hot oil 13 from the supply volume 73 of the hot tank 70 to the heat exchanger 90, the oil 13 thus cooled passes through the module 12.1 and is discharged into the deaeration volume 81 of the cold tank 80.
- the pump 50 the actuation of which is linked to the operation of the gas turbine 9, is not operational.
- the pump 60 transfers, for its part, the deaerated oil 13 from the supply volume 83 to the reducer 10, the oil 13 is then recovered at the outlet of the reducer 10 to be discharged into the deaeration volume 71 of the tank 70.
- the first circuit 20 comprises a second heat exchanger 23 whose second cold source is a fuel circuit 170 of the turbomachine 1.
- the second circuit 30 comprises a third heat exchanger 33 whose third cold source is a fuel circuit 170 of the turbomachine 1.
- the third circuit 40 comprises a fourth heat exchanger 43 whose fourth cold source is a fuel circuit 170 of the turbomachine 1.
- the first circuit 20, the second circuit 30 and the third circuit 40 respectively comprise a first oil 13 filtration device 24, a second oil 13 filtration device 34 and a third oil 13 filtration device 44.
- the first supply volume 73 and the second supply volume 83 are fluidically connected by a fourth forcing pump 118.
- the lubrication/cooling system comprises a third pump which fluidically connects the fifth outlet of the hot tank to the seventh inlet of the heat exchanger
- the invention also applies to a fluid connection from the fifth outlet to the seventh inlet comprising an arrangement of controlled or non-controlled valves and bypasses which connect the first and second pumps;
- the invention also applies to other locations of the third pump such as for example an location in the fourth circuit;
- the invention applies to other means of functionally connecting the first pump and the gas turbine so that the first pump is operated during all the operating phases of the gas turbine, such as a connection of the first pump to a mechanical power take-off of the reducer;
- the invention applies to other means of functionally connecting the second and/or the third pump and the propulsive propeller so that the first pump is actuated during all phases of operation of the propulsive propeller, such as for example a connection of the second pump and the third pump to a mechanical power take-off of the reducer;
- the invention also applies to other configurations such as for example a combination of the two tanks in the same enclosure without being separated by a partition and in which the fifth inlet and outlet as well as the sixth inlet and outlet are located so as to draw the lubricating and/or cooling fluid from the relevant volumes;
- first and second tanks are combined within the same enclosure and separated by a partition
- the invention also applies to two tanks defined by distinct, physically separate envelopes.
- the invention also applies to other configurations of the deaeration and supply volumes such as for example a deaeration volume and a supply volume physically separated by a stilling wall or even by a deaerator;
- the exchanger is a fluid/air type exchanger
- the invention also applies to other types of heat exchanger such as for example a fluid/fluid exchanger whose cold circuit would be supplied with fuel or coolant such as water;
- the invention also applies to other types of fluid connection such as for example a pipe in the case of two separate tanks, a controlled or non-controlled valve, or a forcing pump;
- the first heat exchanger is a fluid/air heat exchanger
- the invention also applies to other types of first heat exchanger such as for example a fluid/fluid exchanger in which the cooling fluid can be a fuel circuit of the aircraft;
- the tanks comprise deaeration and supply volumes, this is a purely functional designation and these volumes are not necessarily physically segregated;
- connections between the pumps and the propeller are direct mechanical connections by transmission shaft
- the functional connection between the pumps and the propeller can be made according to other kinematic chains such as for example shafts connected to the reducer or to a power take-off coupled to the output shaft of the electric machine.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24738014.0A EP4735745A1 (fr) | 2023-06-29 | 2024-06-11 | Système de lubrification/refroidissement pour aéronef et enceinte hydraulique |
| CN202480043399.3A CN121420127A (zh) | 2023-06-29 | 2024-06-11 | 用于飞行器的润滑/冷却系统和液压封壳 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FRFR2306880 | 2023-06-29 | ||
| FR2306880A FR3150547B1 (fr) | 2023-06-29 | 2023-06-29 | Système de lubrification/refroidissement pour aéronef et enceinte hydraulique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2025003590A1 true WO2025003590A1 (fr) | 2025-01-02 |
Family
ID=88207396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2024/050758 Ceased WO2025003590A1 (fr) | 2023-06-29 | 2024-06-11 | Système de lubrification/refroidissement pour aéronef et enceinte hydraulique |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4735745A1 (fr) |
| CN (1) | CN121420127A (fr) |
| FR (1) | FR3150547B1 (fr) |
| WO (1) | WO2025003590A1 (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005054779A (ja) * | 2003-07-24 | 2005-03-03 | Hitachi Ltd | ガスタービン発電設備及びその運転方法 |
| EP2166196A2 (fr) * | 2008-09-18 | 2010-03-24 | United Technologies Corporation | Réservoir d'huile à alimentation en continu pour fonctionnement en gravité nulle ou négative |
| US20200277075A1 (en) * | 2019-03-01 | 2020-09-03 | Pratt & Whittney Canada Corp. | Circulating coolant fluid in hybrid electrical propulsion systems |
-
2023
- 2023-06-29 FR FR2306880A patent/FR3150547B1/fr active Active
-
2024
- 2024-06-11 WO PCT/FR2024/050758 patent/WO2025003590A1/fr not_active Ceased
- 2024-06-11 CN CN202480043399.3A patent/CN121420127A/zh active Pending
- 2024-06-11 EP EP24738014.0A patent/EP4735745A1/fr active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005054779A (ja) * | 2003-07-24 | 2005-03-03 | Hitachi Ltd | ガスタービン発電設備及びその運転方法 |
| EP2166196A2 (fr) * | 2008-09-18 | 2010-03-24 | United Technologies Corporation | Réservoir d'huile à alimentation en continu pour fonctionnement en gravité nulle ou négative |
| US20200277075A1 (en) * | 2019-03-01 | 2020-09-03 | Pratt & Whittney Canada Corp. | Circulating coolant fluid in hybrid electrical propulsion systems |
Also Published As
| Publication number | Publication date |
|---|---|
| CN121420127A (zh) | 2026-01-27 |
| FR3150547B1 (fr) | 2025-05-23 |
| FR3150547A1 (fr) | 2025-01-03 |
| EP4735745A1 (fr) | 2026-05-06 |
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