EP2594741A2 - Diffuser, in particular for an axial flow machine - Google Patents
Diffuser, in particular for an axial flow machine Download PDFInfo
- Publication number
- EP2594741A2 EP2594741A2 EP12191495.6A EP12191495A EP2594741A2 EP 2594741 A2 EP2594741 A2 EP 2594741A2 EP 12191495 A EP12191495 A EP 12191495A EP 2594741 A2 EP2594741 A2 EP 2594741A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- diffuser
- flow
- steps
- cross sectional
- sectional area
- 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.)
- Withdrawn
Links
Images
Classifications
-
- 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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
-
- 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
- F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
- F01D1/02—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
-
- 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
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
- F01D25/162—Bearing supports
-
- 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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
-
- 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
- F05D2260/60—Fluid transfer
- F05D2260/601—Fluid transfer using an ejector or a jet pump
Definitions
- the present invention relates to the field of axial flow machines. It concerns a diffuser as claimed in the preamble of claim 1.
- Diffusers which are arranged at the outlet of stationary gas turbines and which are to reduce the speed of flow of the gases coming out of the turbine and to bring about a build-up of pressure in order to improve the efficiency of the gas turbine, have been known for a long time in the prior art (see, for example, document EP 0 491 966 A1 or document US 2011/058939 A1 along with the attached figure 1 ).
- document EP 0 265 633 B1 proposes dividing the diffuser into several part diffusers in the radial direction by means of flow-conducting baffle plates.
- the inner tapering part of the diffuser is provided with a controllable Coanda flow by way of which the flow in the diffuser can be influenced in a favorable manner.
- the inner part of the diffuser, the hub, tapers downstream without forming a step. From an external source, a gas is guided toward a ring chamber in the hub and from there is injected by means of a number of slotted nozzles in the direction of flow of the hot exhaust gases parallel to the surface of the hub.
- said additional gas flow sucks in hot exhaust gas and deflects it in the direction of the hub.
- EP 0 265 633 B1 provides a sudden transition in the cross sectional area at the outlet of the diffuser which is designated as a Carnot diffuser.
- the invention proceeds from a diffuser, in particular for an axial flow machine, preferably a stationary gas turbine, which diffuser transforms from a ring channel with a first cross sectional area into an outlet space with a second, larger cross sectional area along a machine axis. It is distinguished in that the transition is effected in several steps.
- a first development of the invention is characterized in that the cross sectional area inside the diffuser is increased in two steps. Said diffuser is designed in a particularly simple manner.
- the diffuser is realized as a Carnot diffuser.
- a further development of the invention is distinguished in that the diffuser includes an outer casing and an inner casing, between which the medium flows through the diffuser, and that the steps are generated in the cross sectional area by diameter steps on the inner casing.
- Another development of the invention is characterized in that a ring-shaped, convexly curved guiding surface which tapers in diameter is arranged between two adjacent steps, and that on the upstream step of the two steps there is provided an annular passage, through which a gas flow is able to escape and to flow along the guiding surface in the form of a Coanda flow.
- the flow in the diffuser is able to be influenced in a favorable manner.
- the guiding surface is preferably arranged between the penultimate and the last step of the diffuser.
- Yet another development of the invention is characterized in that the diffuser is arranged at the outlet of an industrial gas turbine.
- Fig. 1 shows the schematic design of a gas turbine with an exhaust gas diffuser, as is known in the prior art.
- the gas turbine 10 shown in figure 1 includes a compressor 12, which sucks in air by means of an air inlet 11 and compresses it. The compressed air is supplied to a combustion chamber 13 and there is used for the combustion of a fuel 14. The resultant hot gas is expanded in a turbine 15 downstream under operating conditions and then flows through a diffuser 16 in order to slow down the speed of flow and to bring about a build-up of pressure.
- FIG. 2 shows a highly simplified representation of the inside design of a conventional Carnot diffuser.
- the diffuser 16 which is realized in a concentric manner with respect to a machine axis 31, on the inlet side includes a ring channel 17, by means of which the exhaust gas 19 of the turbine flows into the diffuser 16.
- Connecting to the ring channel 17 with its comparatively small cross sectional area is an outlet space 21, the cross sectional area of which is substantially larger for the flow.
- the transition between the ring channel 17 and the outlet space 21 is effected, in this example, by means of a sudden step 22, which characterizes the diffuser 16 as a Carnot diffuser.
- Radial struts 18, which connect the inside part and the outside part of the diffuser 16 and at the same time serve for steering the flow, can be arranged in the ring channel 17.
- the invention now proposes, according to the exemplary embodiment shown in figure 3 , to realize the transition between the ring channel 17 and the outlet space 21 in multiple steps in the case of a diffuser 20.
- two steps 22a and 22b are provided for this purpose.
- a further step 22c (shown by the broken line in figure 3 ) is optional.
- the number of steps, however, is not limited upward.
- the diameter jumps connected to the steps 22a-c are limited in the exemplary embodiment in figure 3 to the inside part of the diffuser 20. However, it is also just as conceivable to provide diameter jumps on the outside part of the diffuser.
- Such a multiply stepped inside contour produces a gain in the build-up of pressure which can be 0.1 % of the turbine efficiency and in the case of a GT26 model gas turbine of the Applicant signifies a gain in capacity of almost half a megawatt.
- a corresponding diffuser looks, for example, as shown in figure 4 .
- the diffuser 20a of figure 4 includes a ring-shaped outer casing 23 which surrounds an inner casing 24 in a concentric manner and together with the inner casing 24 defines a flow channel.
- the inner casing 24 and the outer casing 23 are connected by means of radial struts 25.
- Two rings 26 and 27, which are stepped in diameter and by means of which the multiply stepped expansion of the diffuser 20a is brought about, are arranged one behind the other in the axial direction at the outlet of the diffuser 20a.
- the flow conditions in the diffuser can be influenced by means of a Coanda flow, as has been proposed, in principle, in document US 2011/058939 A1 mentioned in the introduction.
- a ring-shaped, convexly curved guiding surface 28 which tapers in diameter is arranged between two steps 22a and 22b in the case of a diffuser 20b.
- an annular passage 29 On the upstream step of the two steps 22a and 22b is provided an annular passage 29, through which a gas flow is able to escape and to flow along the guiding surface 28 in the form of a Coanda flow 30.
- the gas feed for the Coanda flow 30 can be effected in different ways.
- an external reference source for an actively injected additional gas is to be omitted.
- the pressure conditions prevailing in the region of the erratic cross sectional expansion of the diffuser are to be utilized in such a manner that, during operation, a wall flow 30 is automatically built up along the curved guiding surface 28 and said wall flow deflects the parallel exhaust gas flow 19.
- the static pressure p 2 behind the ring body 27 is higher than the inlet pressure p 1 at the annular passage on account of the deceleration of the flow through the cross sectional expansion. Accordingly, a flow 32 is formed from the higher pressure region into the lower one. If more than two steps are present in the diffuser, the Coanda flow is preferably inserted between the penultimate and the last step.
Abstract
Description
- The present invention relates to the field of axial flow machines. It concerns a diffuser as claimed in the preamble of claim 1.
- Diffusers which are arranged at the outlet of stationary gas turbines and which are to reduce the speed of flow of the gases coming out of the turbine and to bring about a build-up of pressure in order to improve the efficiency of the gas turbine, have been known for a long time in the prior art (see, for example,
document EP 0 491 966 A1 or documentUS 2011/058939 A1 along with the attachedfigure 1 ). - In the past, various proposals have been made in order to improve the action of the diffuser at the outlet of a gas turbine and consequently the overall efficiency of the machine. Thus, among other things,
document EP 0 265 633 B1 proposes dividing the diffuser into several part diffusers in the radial direction by means of flow-conducting baffle plates. - In
US 2011/058939 A1 , already mentioned, to improve the flow conditions in the diffuser the inner tapering part of the diffuser is provided with a controllable Coanda flow by way of which the flow in the diffuser can be influenced in a favorable manner. The inner part of the diffuser, the hub, tapers downstream without forming a step. From an external source, a gas is guided toward a ring chamber in the hub and from there is injected by means of a number of slotted nozzles in the direction of flow of the hot exhaust gases parallel to the surface of the hub. As a result of the known Coanda effect, said additional gas flow sucks in hot exhaust gas and deflects it in the direction of the hub. The exhaust gas flow is accelerated there and adapts to the surface of the hub which tapers downstream. In order to achieve a desired influencing of the exhaust gas flow in the diffuser, up to 4% of the exhaust gas mass flow in additional gas has to be injected, which is equal to not insignificant expenditure.
Contrary to this,EP 0 265 633 B1 - Although said measures provide certain improvements in efficiency, the possibilities for exerting influence in the region of the diffuser have not been exhausted by a long way.
- Consequently, it is an object of the invention to create a diffuser, in particular for an industrial gas turbine, which results, in a simple manner, in a further improvement in the overall efficiency of the gas turbine.
- These and other objects are achieved by the totality of the features of claim 1.
- The invention proceeds from a diffuser, in particular for an axial flow machine, preferably a stationary gas turbine, which diffuser transforms from a ring channel with a first cross sectional area into an outlet space with a second, larger cross sectional area along a machine axis. It is distinguished in that the transition is effected in several steps.
- A first development of the invention is characterized in that the cross sectional area inside the diffuser is increased in two steps. Said diffuser is designed in a particularly simple manner.
- As claimed in another development of the invention, the diffuser is realized as a Carnot diffuser.
- A further development of the invention is distinguished in that the diffuser includes an outer casing and an inner casing, between which the medium flows through the diffuser, and that the steps are generated in the cross sectional area by diameter steps on the inner casing.
- Another development of the invention is characterized in that a ring-shaped, convexly curved guiding surface which tapers in diameter is arranged between two adjacent steps, and that on the upstream step of the two steps there is provided an annular passage, through which a gas flow is able to escape and to flow along the guiding surface in the form of a Coanda flow. As a result, the flow in the diffuser is able to be influenced in a favorable manner.
- The guiding surface is preferably arranged between the penultimate and the last step of the diffuser.
- Yet another development of the invention is characterized in that the diffuser is arranged at the outlet of an industrial gas turbine.
- The invention is to be explained below by way of exemplary embodiments in conjunction with the drawing, in which, in more detail:
- fig. 1
- shows the schematic design of a gas turbine with an exhaust gas diffuser, as is known per se;
- fig. 2
- shows the inside design of a conventional Carnot diffuser;
- fig. 3
- shows, in comparison to
figure 2 , the inside design of a multi-step diffuser according to one exemplary embodiment of the invention; - fig. 4
- shows a perspective side view of a 2-step diffuser according to another exemplary embodiment of the invention; and
- fig. 5
- shows the inside design of a 2-step diffuser with Coanda control according to a further exemplary embodiment of the invention.
-
Fig. 1 shows the schematic design of a gas turbine with an exhaust gas diffuser, as is known in the prior art. Thegas turbine 10 shown infigure 1 includes acompressor 12, which sucks in air by means of anair inlet 11 and compresses it. The compressed air is supplied to acombustion chamber 13 and there is used for the combustion of afuel 14. The resultant hot gas is expanded in aturbine 15 downstream under operating conditions and then flows through adiffuser 16 in order to slow down the speed of flow and to bring about a build-up of pressure. -
Figure 2 shows a highly simplified representation of the inside design of a conventional Carnot diffuser. In this case, thediffuser 16, which is realized in a concentric manner with respect to amachine axis 31, on the inlet side includes aring channel 17, by means of which theexhaust gas 19 of the turbine flows into thediffuser 16. Connecting to thering channel 17 with its comparatively small cross sectional area is anoutlet space 21, the cross sectional area of which is substantially larger for the flow. The transition between thering channel 17 and theoutlet space 21 is effected, in this example, by means of asudden step 22, which characterizes thediffuser 16 as a Carnot diffuser.Radial struts 18, which connect the inside part and the outside part of thediffuser 16 and at the same time serve for steering the flow, can be arranged in thering channel 17. - In contrast, the invention now proposes, according to the exemplary embodiment shown in
figure 3 , to realize the transition between thering channel 17 and theoutlet space 21 in multiple steps in the case of adiffuser 20. In the example shown, twosteps further step 22c (shown by the broken line infigure 3 ) is optional. The number of steps, however, is not limited upward. The diameter jumps connected to thesteps 22a-c are limited in the exemplary embodiment infigure 3 to the inside part of thediffuser 20. However, it is also just as conceivable to provide diameter jumps on the outside part of the diffuser. - Such a multiply stepped inside contour produces a gain in the build-up of pressure which can be 0.1 % of the turbine efficiency and in the case of a GT26 model gas turbine of the Applicant signifies a gain in capacity of almost half a megawatt.
- In practice, a corresponding diffuser looks, for example, as shown in
figure 4 . Thediffuser 20a offigure 4 includes a ring-shapedouter casing 23 which surrounds aninner casing 24 in a concentric manner and together with theinner casing 24 defines a flow channel. Theinner casing 24 and theouter casing 23 are connected by means ofradial struts 25. Tworings diffuser 20a is brought about, are arranged one behind the other in the axial direction at the outlet of thediffuser 20a. - In addition to the multi-stepped expansion of the cross sectional flow, the flow conditions in the diffuser can be influenced by means of a Coanda flow, as has been proposed, in principle, in document
US 2011/058939 A1 mentioned in the introduction. To this end, according tofigure 5 , a ring-shaped, convexly curved guidingsurface 28 which tapers in diameter is arranged between twosteps diffuser 20b. On the upstream step of the twosteps annular passage 29, through which a gas flow is able to escape and to flow along the guidingsurface 28 in the form of aCoanda flow 30. In this case, the gas feed for the Coandaflow 30 can be effected in different ways. Contrary to what the aforementioned document teaches, however, as claimed in the invention an external reference source for an actively injected additional gas is to be omitted. By arranging the components in a proper manner, the pressure conditions prevailing in the region of the erratic cross sectional expansion of the diffuser are to be utilized in such a manner that, during operation, awall flow 30 is automatically built up along thecurved guiding surface 28 and said wall flow deflects the parallelexhaust gas flow 19. The static pressure p2 behind thering body 27 is higher than the inlet pressure p1 at the annular passage on account of the deceleration of the flow through the cross sectional expansion. Accordingly, aflow 32 is formed from the higher pressure region into the lower one.
If more than two steps are present in the diffuser, the Coanda flow is preferably inserted between the penultimate and the last step. -
- 10
- Gas turbine
- 11
- Air inlet
- 12
- Compressor
- 13
- Combustion chamber
- 14
- Fuel
- 15
- Turbine
- 16,20
- Diffuser
- 17
- Ring channel
- 18,25
- Strut
- 19
- Exhaust gas
- 20a,b
- Diffuser
- 21
- Outlet space
- 22a-c
- Step (cross sectional area)
- 23
- Outer casing
- 24
- Inner casing
- 26,27
- Ring
- 28
- Guiding surface (curved convexly)
- 29
- Annular passage
- 30
- Coanda flow
- 31
- Machine axis
- 32
- Return flow
Claims (7)
- A diffuser (20, 20a, 20b), in particular for an axial flow machine, preferably a stationary gas turbine (10), which diffuser (20, 20a, 20b) transforms from a ring channel (17) with a first cross sectional area into an outlet space (21) with a second, larger cross sectional area along a machine axis (31), characterized in that the transition is effected in several steps (22a-c).
- The diffuser as claimed in claim 1, characterized in that the cross sectional area inside the diffuser (20, 20a, 20b) is increased in two steps (22a, 22b).
- The diffuser as claimed in claim 1 or 2, characterized in that the diffuser (20, 20a, 20b) is realized as a Carnot diffuser.
- The diffuser as claimed in one of claims 1-3, characterized in that the diffuser (20a) includes an outer casing (23) and an inner casing (24), between which the medium flows through the diffuser (20a), and in that the steps (22a-c) are generated in the cross sectional area by diameter steps on the inner casing (24).
- The diffuser as claimed in one of claims 1-4, characterized in that a ring-shaped, convexly curved guiding surface (28) which tapers in diameter is arranged between two adjacent steps (22a, 22b), and in that on the upstream step of the two steps (22a, 22b) there is provided an annular passage (29), through which a gas flow is able to emerge and flow along the guiding surface (28) in the form of a Coanda flow (30) .
- The diffuser as claimed in claim 5, characterized in that the guiding surface (28) is arranged between the penultimate and the last step of the diffuser (20b).
- The diffuser as claimed in one of claims 1-6, characterized in that the diffuser (20, 20a, 20b) is arranged at the outlet of a stationary gas turbine (10).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011118735A DE102011118735A1 (en) | 2011-11-17 | 2011-11-17 | DIFFUSER, ESPECIALLY FOR AN AXIAL FLOW MACHINE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2594741A2 true EP2594741A2 (en) | 2013-05-22 |
EP2594741A3 EP2594741A3 (en) | 2017-08-23 |
Family
ID=47215404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12191495.6A Withdrawn EP2594741A3 (en) | 2011-11-17 | 2012-11-06 | Diffuser, in particular for an axial flow machine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130129498A1 (en) |
EP (1) | EP2594741A3 (en) |
JP (2) | JP2013108498A (en) |
CN (1) | CN103122776B (en) |
DE (1) | DE102011118735A1 (en) |
RU (1) | RU2569015C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2896793A1 (en) | 2014-01-21 | 2015-07-22 | Alstom Technology Ltd | Method of operating a gas turbine assembly and the gas turbine assembly |
EP3882435A1 (en) * | 2020-03-20 | 2021-09-22 | Doosan Heavy Industries & Construction Co., Ltd. | Exhaust diffuser hub structure for reducing flow separation |
Families Citing this family (7)
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EP2947283B1 (en) | 2014-05-23 | 2017-01-11 | GE Energy Products France SNC | Thermal-acoustic insulation structure for the exhaust of a rotating machine |
EP3023695A1 (en) * | 2014-11-20 | 2016-05-25 | Siemens Aktiengesellschaft | Thermal energy machine |
FR3029568B1 (en) * | 2014-12-05 | 2016-11-18 | Turbomeca | PLENUM OF AIR SUPPLY |
US10563543B2 (en) * | 2016-05-31 | 2020-02-18 | General Electric Company | Exhaust diffuser |
RU2632354C1 (en) * | 2016-12-01 | 2017-10-04 | Открытое акционерное общество "Научно-производственное объединение по исследованию и проектированию энергетического оборудования им. И.И. Ползунова" (ОАО "НПО ЦКТИ") | Steam turbine double-flow low-pressure cylinder |
US11291938B2 (en) | 2016-12-16 | 2022-04-05 | General Electric Technology Gmbh | Coanda effect moisture separator system |
US11840937B2 (en) | 2021-12-17 | 2023-12-12 | Pratt & Whitney Canada Corp. | Diffuser nozzle for a gas turbine engine |
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US20110058939A1 (en) | 2009-06-02 | 2011-03-10 | John Orosa | Turbine exhaust diffuser with a gas jet producing a coanda effect flow control |
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-
2011
- 2011-11-17 DE DE102011118735A patent/DE102011118735A1/en not_active Withdrawn
-
2012
- 2012-11-06 EP EP12191495.6A patent/EP2594741A3/en not_active Withdrawn
- 2012-11-16 RU RU2012148919/06A patent/RU2569015C2/en not_active IP Right Cessation
- 2012-11-16 US US13/678,676 patent/US20130129498A1/en not_active Abandoned
- 2012-11-16 JP JP2012252515A patent/JP2013108498A/en active Pending
- 2012-11-16 CN CN201210465817.7A patent/CN103122776B/en not_active Expired - Fee Related
-
2016
- 2016-07-14 JP JP2016139281A patent/JP6188885B2/en not_active Expired - Fee Related
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2896793A1 (en) | 2014-01-21 | 2015-07-22 | Alstom Technology Ltd | Method of operating a gas turbine assembly and the gas turbine assembly |
US10151250B2 (en) | 2014-01-21 | 2018-12-11 | Ansaldo Energia Switzerland AG | Method of operating a gas turbine assembly and the gas turbine assembly |
EP3882435A1 (en) * | 2020-03-20 | 2021-09-22 | Doosan Heavy Industries & Construction Co., Ltd. | Exhaust diffuser hub structure for reducing flow separation |
CN113494317A (en) * | 2020-03-20 | 2021-10-12 | 斗山重工业建设有限公司 | Hub structure of exhaust diffuser for reducing flow stripping phenomenon |
US11506145B2 (en) | 2020-03-20 | 2022-11-22 | Doosan Enerbility Co., Ltd | Exhaust diffuser hub structure for reducing flow separation |
CN113494317B (en) * | 2020-03-20 | 2024-02-27 | 斗山重工业建设有限公司 | Hub structure of exhaust diffuser for reducing flow separation phenomenon |
Also Published As
Publication number | Publication date |
---|---|
JP6188885B2 (en) | 2017-08-30 |
JP2016180412A (en) | 2016-10-13 |
RU2012148919A (en) | 2014-05-27 |
CN103122776A (en) | 2013-05-29 |
US20130129498A1 (en) | 2013-05-23 |
CN103122776B (en) | 2016-02-10 |
JP2013108498A (en) | 2013-06-06 |
EP2594741A3 (en) | 2017-08-23 |
DE102011118735A1 (en) | 2013-05-23 |
RU2569015C2 (en) | 2015-11-20 |
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