EP2224096A1 - Steam turbine and method for extracting moisture from a steam turbine - Google Patents
Steam turbine and method for extracting moisture from a steam turbine Download PDFInfo
- Publication number
- EP2224096A1 EP2224096A1 EP09153874A EP09153874A EP2224096A1 EP 2224096 A1 EP2224096 A1 EP 2224096A1 EP 09153874 A EP09153874 A EP 09153874A EP 09153874 A EP09153874 A EP 09153874A EP 2224096 A1 EP2224096 A1 EP 2224096A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slot
- steam turbine
- stator
- end wall
- moisture
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000012141 concentrate Substances 0.000 claims abstract description 7
- 230000007423 decrease Effects 0.000 claims description 4
- 230000003628 erosive effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
- F01D5/142—Shape, i.e. outer, aerodynamic form of the blades of successive rotor or stator blade-rows
- F01D5/143—Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
-
- 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
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
-
- 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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
Definitions
- the present invention relates to a steam turbine and a method for extracting moisture from a steam turbine.
- the present invention refers to low pressure steam turbines.
- Steam turbine plants (in particular plants for electricity generation) are known to comprise a steam generator that feeds a turbine; the turbine expands the steam to operate an electrical generator and then discharges the exhausted steam in a condenser.
- steam turbines in particular low pressure stages of steam turbines
- devices that extract the moisture and discharge it to the outside.
- stator blades With reference to the stator blades, such devices are often provided upstream of the stator blades and/or downstream of the stator blades.
- Each stator airfoil has an end wall that is connected to the casing and from which a stator blade extends.
- the casing Downstream of the stator airfoil the casing is provided with a circumferential slot arranged to receive the moisture that during operation (due to the centrifugal forces caused by the swirling steam flow and the rotating parts) concentrates near the end wall of the airfoils.
- the amount of moisture that is extracted trough the slot must be as high as possible; thus the slot should be as large as possible to let a large amount of moisture be seized therein.
- the technical aim of the present invention is therefore to provide a steam turbine and a method for extracting moisture from a steam turbine by which the said problems of the known art are eliminated.
- an object of the invention is to provide a steam turbine and a method that let a large amount of moisture be extracted from the low pressure expansion stages with respect to traditional steam turbines, but at the same time that cause only a small extraction of dry steam.
- Another object of the invention is to provide a steam turbine and a method that let both performance and reliability be increased with respect to traditional steam turbines.
- the steam turbine comprises a casing 1 that contains a plurality of expansion stages.
- Each expansion stage comprises a plurality of stator airfoils 2 downstream of which a plurality of rotor airfoils 5 are provided; in particular, each stator airfoil 2 comprises an end wall 3 that is connected to the casing 1 and from which a stator blade 4 extends.
- the casing 1 In order to extract moisture from the steam turbine, downstream of the stator airfoils 2 of one or all the expansion stages (the enclosed figures show only one stage), the casing 1 has a circumferential slot 7 that is arranged to receive the moisture that concentrates on the end wall 3 of the stator airfoils 2 and discharge it to the outside of the steam turbine, for example via holes 8.
- Each stator airfoil 2 has the end wall 3 that defines with the slot 7 a passage 10 through which the moisture may pass.
- This passage 10 is smaller or closed at the suction side 12 and is larger at the pressure side 13 of each stator blade 4, to at least partially prevent the dry steam from entering the slot 7 at the suction side 12 of the blades 4.
- each end wall 3 has a portion facing the slot 7 having a variable radial obstruction in a tangential direction.
- the portion facing the slot 7 of the end wall 3 has at the suction side 12 a thick zone 15 that is located adjacent to the stator blade 4 and partially or completely obstructs the slot 7.
- the portion facing the slot 7 of the end wall 3 has a thin zone 17 that is adjacent to the thick zone 15 in a tangential direction.
- the thin zone 17 has a thickness that, in a tangential direction, continuously decreases from that of the thick zone 15 towards the side of the end wall 3.
- the thin zone 17 also has a thickness that, in an axial direction, continuously decreases from its portion opposite the portion facing the slot 7 toward the portion facing the slot 7.
- the steam flow flows in the axial direction (as shown by arrows F) and, when passing through the stator and rotor blades 4, 5, it turns to follow the curved channels.
- the particular shape of the end walls 3 forces the moisture to run towards the zone of the end walls 3 at the pressure side 13 of the blades 4 (see arrows M).
- the steam turbine of the invention lets the amount of moisture discharged be increased and/or the amount of dry steam discharged be reduced with respect to traditional steam turbines.
- FIG. 5A shows a different embodiment of the invention.
- the same reference numbers are used for elements already described.
- variable radial obstruction is defined by a slope at the end wall.
- the step has a wall 20 perpendicular to the surfaces of the thick zone 15 and thin zone 17 or, alternatively, tilted with respect to them (or at least one of them).
- FIGS 7-9 show a further different embodiment of the invention.
- the same reference numbers are used for elements already described.
- variable radial obstruction is defined by a slope at the end wall; the slope projects inwardly from the leading edge 18 of each stator blade 4 to the trailing edge 19 of the same stator blade 4. Moreover the slope is adjacent to each stator blade 4 at its suction side 12.
- the present invention also relates to a method for extracting moisture from a steam turbine that comprises a casing 1 containing a plurality of expansion stages each comprising stator and rotor airfoils and downstream of the stator airfoils of at least a stage the casing 1 is provided with a circumferential slot 7 arranged to receive the moisture that concentrates on an end wall 3 of the stator airfoils 2 and discharge it to the outside.
- the end wall 3 of the stator airfoils 2 drives the moisture away from the suction side 12 of its blade and at least partially prevents the dry steam from entering the slot 7 at the suction side 12 of the blade 4.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
- The present invention relates to a steam turbine and a method for extracting moisture from a steam turbine.
- In particular, the present invention refers to low pressure steam turbines.
- Steam turbine plants (in particular plants for electricity generation) are known to comprise a steam generator that feeds a turbine; the turbine expands the steam to operate an electrical generator and then discharges the exhausted steam in a condenser.
- In order to extract from the steam the highest power as possible, steam is usually expanded far into the wet steam region.
- Even if from the one hand this lets the power be increased, on the other hand this causes the generation within the steam of moisture that has a number of negative effects.
- In fact, because of their high momentum of inertia, moisture droplets (in particular when they exceed a certain size) cannot follow the turning of the steam flow; thus they impinge on the following blade surface causing the so called wet steam erosion.
- This problem is particularly relevant in low pressure turbines where expansion in the wet steam region takes place and often the amount of moisture is large.
- In order to solve this problem, steam turbines (in particular low pressure stages of steam turbines) are often provided with devices that extract the moisture and discharge it to the outside.
- With reference to the stator blades, such devices are often provided upstream of the stator blades and/or downstream of the stator blades.
- In the following, the extraction devices downstream of the stator blades will be discussed in detail.
- Steam turbines have a casing that carries the stator airfoils.
- Each stator airfoil has an end wall that is connected to the casing and from which a stator blade extends.
- Downstream of the stator airfoil the casing is provided with a circumferential slot arranged to receive the moisture that during operation (due to the centrifugal forces caused by the swirling steam flow and the rotating parts) concentrates near the end wall of the airfoils.
- In order to protect the blades from erosion, the amount of moisture that is extracted trough the slot must be as high as possible; thus the slot should be as large as possible to let a large amount of moisture be seized therein.
- Nevertheless, a large slot (in addition to a large amount of moisture) also seizes a large amount of dry steam.
- This causes a loss in performance that should be avoided.
- The technical aim of the present invention is therefore to provide a steam turbine and a method for extracting moisture from a steam turbine by which the said problems of the known art are eliminated.
- Within the scope of this technical aim, an object of the invention is to provide a steam turbine and a method that let a large amount of moisture be extracted from the low pressure expansion stages with respect to traditional steam turbines, but at the same time that cause only a small extraction of dry steam.
- Another object of the invention is to provide a steam turbine and a method that let both performance and reliability be increased with respect to traditional steam turbines.
- The technical aim, together with these and further objects, are attained according to the invention by providing a steam turbine and a method for extracting moisture from a steam turbine in accordance with the accompanying claims.
- Further characteristics and advantages of the invention will be more apparent from the description of a preferred but non-exclusive embodiment of the steam turbine and the method according to the invention, illustrated by way of non-limiting example in the accompanying drawings, in which:
-
Figure 1 is a schematic perspective view of three stator airfoils according to the invention associated with a slot of the casing (the slot is shown in dashed line); -
Figures 2-4 are schematic cross section through lines II-II, III-III and IV-IV offigure 1 , in these figures a part of the casing defining the slot is also shown; -
Figure 5 is a further schematic prospective view of three stator airfoils according to the invention; also in this figure the slot is shown in dashed line; -
Figure 5A is a schematic prospective view of three stator airfoils according to the invention in a different embodiment; also in this figure the slot is shown in dashed line; -
Figure 6 is a schematic longitudinal section of a portion of a turbine according to the invention; -
Figure 7 is a perspective view of a stator airfoil row according to the invention; and -
Figures 8 and 9 are details offigure 7 , for sake of clarity they only show some of the stator airfoils. - The steam turbine comprises a
casing 1 that contains a plurality of expansion stages. - Each expansion stage comprises a plurality of
stator airfoils 2 downstream of which a plurality ofrotor airfoils 5 are provided; in particular, eachstator airfoil 2 comprises anend wall 3 that is connected to thecasing 1 and from which astator blade 4 extends. - In order to extract moisture from the steam turbine, downstream of the
stator airfoils 2 of one or all the expansion stages (the enclosed figures show only one stage), thecasing 1 has acircumferential slot 7 that is arranged to receive the moisture that concentrates on theend wall 3 of thestator airfoils 2 and discharge it to the outside of the steam turbine, for example viaholes 8. - Each
stator airfoil 2 has theend wall 3 that defines with the slot 7 apassage 10 through which the moisture may pass. - This
passage 10 is smaller or closed at thesuction side 12 and is larger at thepressure side 13 of eachstator blade 4, to at least partially prevent the dry steam from entering theslot 7 at thesuction side 12 of theblades 4. - In order to define a smaller or closed
passage 10 at thesuction side 12 of thestator blades 4, eachend wall 3 has a portion facing theslot 7 having a variable radial obstruction in a tangential direction. - In this respect, the portion facing the
slot 7 of theend wall 3 has at the suction side 12 athick zone 15 that is located adjacent to thestator blade 4 and partially or completely obstructs theslot 7. - Moreover, the portion facing the
slot 7 of theend wall 3 has athin zone 17 that is adjacent to thethick zone 15 in a tangential direction. - Advantageously, the
thin zone 17 has a thickness that, in a tangential direction, continuously decreases from that of thethick zone 15 towards the side of theend wall 3. - The
thin zone 17 also has a thickness that, in an axial direction, continuously decreases from its portion opposite the portion facing theslot 7 toward the portion facing theslot 7. - The operation of the steam turbine of the invention is apparent from that described and illustrated and is substantially the following.
- The steam flow flows in the axial direction (as shown by arrows F) and, when passing through the stator and
rotor blades - Due to the centrifugal forces and the inertia, the moisture is forced to concentrate on the
end walls 3 of thestator airfoils 2, at thepressure side 13 of theirblades 4. - In addition, the particular shape of the
end walls 3 forces the moisture to run towards the zone of theend walls 3 at thepressure side 13 of the blades 4 (see arrows M). - From this zone the moisture passes through the
passages 10 and enters theslot 7 to be discharged to the outside of the steam turbine. - Naturally, in addition to the moisture, also dry steam is discharged through the
passages 10. - Nevertheless, as the zones close to the
suction sides 12 of thestator blades 4 are not provided with passages 10 (or in any case these passages are smaller than that at the pressure sides 13) neither moisture nor dry steam is discharged through these zones (or in any case only limited amounts are discharged). - Therefore, as the moisture is concentrated in the zones close to the
pressure sides 13 of theblades 4, whereas the dry steam is almost uniformly distributed in the channels defined between twoadjacent stator blades 4, the steam turbine of the invention lets the amount of moisture discharged be increased and/or the amount of dry steam discharged be reduced with respect to traditional steam turbines. -
Figure 5A shows a different embodiment of the invention. In this embodiment the same reference numbers are used for elements already described. - In this embodiment the variable radial obstruction is defined by a slope at the end wall.
- Moreover, between the
thick zone 15 and thethin zone 17 there is provided a step. The step has awall 20 perpendicular to the surfaces of thethick zone 15 andthin zone 17 or, alternatively, tilted with respect to them (or at least one of them). -
Figures 7-9 show a further different embodiment of the invention. In this embodiment the same reference numbers are used for elements already described. - Even in this embodiment the variable radial obstruction is defined by a slope at the end wall; the slope projects inwardly from the leading
edge 18 of eachstator blade 4 to thetrailing edge 19 of thesame stator blade 4. Moreover the slope is adjacent to eachstator blade 4 at itssuction side 12. - The present invention also relates to a method for extracting moisture from a steam turbine that comprises a
casing 1 containing a plurality of expansion stages each comprising stator and rotor airfoils and downstream of the stator airfoils of at least a stage thecasing 1 is provided with acircumferential slot 7 arranged to receive the moisture that concentrates on anend wall 3 of thestator airfoils 2 and discharge it to the outside. - According to the method of the invention, the
end wall 3 of thestator airfoils 2 drives the moisture away from thesuction side 12 of its blade and at least partially prevents the dry steam from entering theslot 7 at thesuction side 12 of theblade 4. - The steam turbine and the method conceived in this manner are susceptible to numerous modifications and variants, all falling within the scope of the inventive concept; moreover all details can be replaced by technically equivalent elements.
- In practice the materials used and the dimensions can be chosen at will according to requirements and to the state of the art.
-
- 1
- casing
- 2
- stator airfoil
- 3
- end wall
- 4
- stator blade
- 5
- rotor blades
- 7
- slot
- 8
- holes
- 10
- passage
- 12
- suction side of the blades
- 13
- pressure side of the blades
- 15
- thick zone of the end wall
- 17
- thin zone of the end wall
- 18
- leading edge of the stator blade
- 19
- trailing edge of the stator blade
- 20
- wall of the step
- F
- steam flow
- M
- moisture
Claims (14)
- Steam turbine comprising a casing (1) containing a plurality of expansion stages each comprising stator and rotor airfoils, wherein downstream of the stator airfoils of at least an expansion stage the casing (1) comprises a slot (7) arranged to receive moisture that concentrates on an end wall (3) of the stator airfoils (2) and discharge it to the outside, characterised in that each end wall (3) has a side portion facing the slot (7) having a variable radial obstruction in a tangential direction, in order to define with the slot (7) a passage (10) through which the moisture may pass that is smaller or closed at the suction side (12) and larger at the pressure side (13) of the stator blades (4), to at least partially prevent the dry steam from entering the slot (7) at the suction side (12) of the blade (4).
- Steam turbine as claimed in claim 1, characterised in that, said slot (7) is a circumferential slot.
- Steam turbine as claimed in claim 1, characterised in that the portion facing the slot (7) of the end wall (3) has at its suction side (12) a thick zone (15) that is located adjacent to the stator blade (4) and partially obstructs the slot (7).
- Steam turbine as claimed in claim 3, characterised in that said thick portion (15) completely obstructs the slot (7).
- Steam turbine as claimed in claim 3, characterised in that said thick portion (15) is adjacent to each stator blade (4) at its suction side (12).
- Steam turbine as claimed in claim 3, characterised in that, the portion facing the slot (7) of the end wall (3) has a thin zone (17) that is adjacent to the thick zone (15) in a tangential direction.
- Steam turbine as claimed in claim 6, characterised in that, in a tangential direction, said thin portion (17) has a thickness that continuously decrease from that of the thick portion (15) toward the side of the end wall (3).
- Steam turbine as claimed in claim 6, characterised in that, in an axial direction, the thin zone has a thickness that continuously decreases from its portion opposite the portion facing the slot (7) towards the portion facing the slot (7).
- Steam turbine as claimed in claim 1, characterised in that the variable radial obstruction is defined by a slope at the end wall.
- Steam turbine as claimed in claim 6 and 9, characterised in that between the thick zone (15) and the thin zone (17) there is provided a step.
- Steam turbine as claimed in claim 10, characterised in that said step has a wall (20) perpendicular to the surfaces of the thick zone (15) and thin zone (17).
- Steam turbine as claimed in claim 10, characterised in that said step has a wall (20) tilted with respect to the surfaces of the thick zone (15) and/or thin zone (17).
- Method for extracting moisture from a steam turbine comprising a casing (1) containing a plurality of expansion stages each comprising stator and rotor airfoils, wherein downstream of the stator airfoils of at least a stage the casing (1) is provided with a slot (7) arranged to receive the moisture that concentrates on an end wall (3) of the stator airfoils (2) and discharge it to the outside, the method being characterised in that the end wall (3) of the stator airfoils (2) at least partially prevents the dry steam from entering the slot (7) at the suction side (12) of the blade (4).
- Method as claimed in claim 13, characterised in that the end wall (3) of the stator airfoils (2) drives the moisture away from the suction side (12) of its blade (4).
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09153874A EP2224096A1 (en) | 2009-02-27 | 2009-02-27 | Steam turbine and method for extracting moisture from a steam turbine |
DE102010007985A DE102010007985A1 (en) | 2009-02-27 | 2010-02-15 | Steam turbine and method for extracting moisture from a steam turbine |
JP2010039512A JP2010203438A (en) | 2009-02-27 | 2010-02-25 | Steam turbine and method for extracting moisture from steam turbine |
US12/713,818 US20100221095A1 (en) | 2009-02-27 | 2010-02-26 | Steam turbine and method for extracting moisture from a steam turbine |
CN201010151618.XA CN101818660A (en) | 2009-02-27 | 2010-02-26 | The method that steam turbine and being used for absorbs water from steam turbine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09153874A EP2224096A1 (en) | 2009-02-27 | 2009-02-27 | Steam turbine and method for extracting moisture from a steam turbine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2224096A1 true EP2224096A1 (en) | 2010-09-01 |
Family
ID=40673661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09153874A Withdrawn EP2224096A1 (en) | 2009-02-27 | 2009-02-27 | Steam turbine and method for extracting moisture from a steam turbine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100221095A1 (en) |
EP (1) | EP2224096A1 (en) |
JP (1) | JP2010203438A (en) |
CN (1) | CN101818660A (en) |
DE (1) | DE102010007985A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5834538B2 (en) | 2011-06-27 | 2015-12-24 | 株式会社Ihi | Waste heat generator |
JP6125351B2 (en) * | 2013-06-27 | 2017-05-10 | 株式会社東芝 | Steam turbine |
US10781722B2 (en) * | 2015-12-11 | 2020-09-22 | General Electric Company | Steam turbine, a steam turbine nozzle, and a method of managing moisture in a steam turbine |
EP3369892B1 (en) * | 2017-03-03 | 2020-08-19 | MTU Aero Engines GmbH | Contouring of a blade row platform |
CH715181B1 (en) * | 2017-09-05 | 2023-03-15 | Mitsubishi Heavy Ind Ltd | Steam turbine blade, steam turbine and method of manufacturing a steam turbine blade. |
WO2022064670A1 (en) * | 2020-09-28 | 2022-03-31 | 三菱パワー株式会社 | Steam turbine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1426836A1 (en) * | 1964-05-12 | 1969-01-30 | Merz & Mclellan Service Ltd | Axial steam turbine |
JPS5267404A (en) * | 1975-12-01 | 1977-06-03 | Hitachi Ltd | Blades structure |
GB2079399A (en) * | 1980-06-24 | 1982-01-20 | Mtu Muenchen Gmbh | Improvements in and relating to a rotary machine |
US5112187A (en) * | 1990-09-12 | 1992-05-12 | Westinghouse Electric Corp. | Erosion control through reduction of moisture transport by secondary flow |
WO1998044240A1 (en) * | 1997-04-01 | 1998-10-08 | Siemens Aktiengesellschaft | Surface structure for the wall of a flow channel or a turbine blade |
DE10327977A1 (en) * | 2003-06-21 | 2005-01-05 | Alstom Technology Ltd | Sidewall design of a deflecting flow channel |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2111878A (en) * | 1935-07-02 | 1938-03-22 | Hermannus Van Tongeren | Means for draining moisture from steam in steam turbines |
DE102004043036A1 (en) * | 2004-09-06 | 2006-03-09 | Rolls-Royce Deutschland Ltd & Co Kg | Fluid flow machine with fluid removal |
-
2009
- 2009-02-27 EP EP09153874A patent/EP2224096A1/en not_active Withdrawn
-
2010
- 2010-02-15 DE DE102010007985A patent/DE102010007985A1/en not_active Withdrawn
- 2010-02-25 JP JP2010039512A patent/JP2010203438A/en not_active Withdrawn
- 2010-02-26 US US12/713,818 patent/US20100221095A1/en not_active Abandoned
- 2010-02-26 CN CN201010151618.XA patent/CN101818660A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1426836A1 (en) * | 1964-05-12 | 1969-01-30 | Merz & Mclellan Service Ltd | Axial steam turbine |
JPS5267404A (en) * | 1975-12-01 | 1977-06-03 | Hitachi Ltd | Blades structure |
GB2079399A (en) * | 1980-06-24 | 1982-01-20 | Mtu Muenchen Gmbh | Improvements in and relating to a rotary machine |
US5112187A (en) * | 1990-09-12 | 1992-05-12 | Westinghouse Electric Corp. | Erosion control through reduction of moisture transport by secondary flow |
WO1998044240A1 (en) * | 1997-04-01 | 1998-10-08 | Siemens Aktiengesellschaft | Surface structure for the wall of a flow channel or a turbine blade |
DE10327977A1 (en) * | 2003-06-21 | 2005-01-05 | Alstom Technology Ltd | Sidewall design of a deflecting flow channel |
Also Published As
Publication number | Publication date |
---|---|
CN101818660A (en) | 2010-09-01 |
DE102010007985A1 (en) | 2010-09-02 |
US20100221095A1 (en) | 2010-09-02 |
JP2010203438A (en) | 2010-09-16 |
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