WO2010006976A1 - Axial turbine for a gas turbine with limited play between blades and housing - Google Patents
Axial turbine for a gas turbine with limited play between blades and housing Download PDFInfo
- Publication number
- WO2010006976A1 WO2010006976A1 PCT/EP2009/058682 EP2009058682W WO2010006976A1 WO 2010006976 A1 WO2010006976 A1 WO 2010006976A1 EP 2009058682 W EP2009058682 W EP 2009058682W WO 2010006976 A1 WO2010006976 A1 WO 2010006976A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- axial turbine
- blade
- radial
- annular space
- region
- Prior art date
Links
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
- F01D5/20—Specially-shaped blade tips to seal space between tips and stator
-
- 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
-
- 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
Definitions
- the invention relates to an axial turbine for a gas turbine, wherein the axial turbine has low gap losses.
- a gas turbine has a turbine, for example in axial design.
- the turbine has a housing and a rotor which is surrounded by the housing.
- the rotor has a shaft on which shaft power is removable.
- a hub Surrounding the shaft, a hub is provided whose hub contour together with the inner contour of the housing forms a flow channel through the turbine.
- the flow channel has a flow direction in Stro ⁇ widening cross section due to a generally conical inner contour of the housing.
- the rotor has a plurality of rotor stages, each of which is formed by a blade lattice.
- the running cascadeless have a plurality of rotor blades, which are fastened with their one end in each case on the hub side to the rotor and radially outwardly zei ⁇ gene with its other end.
- At the other end of the rotor blade is a bucket formed tip of the Inside facing the housing and disposed immediately adjacent.
- the distance between the blade tips and the inside of the housing is formed as a radial gap, which is dimensioned such that on the one hand the blade tips do not touch the housing during operation of the gas turbine and, on the other hand, the leakage flow through the radial gap that occurs during operation of the gas turbine is low.
- the turbine housing is solidly engineered to withstand the pressure and temperature stresses associated with gas turbine operation. Furthermore, the housing is rigid, so that the load application to the housing during operation of the gas turbine has only a small deformation of the housing result. In contrast, the blades are thinner and less massive compared to the housing.
- the inside of the house and the blades are in contact with hot gas, with the blades completely bypassing the hot gas. Because the blades are more delicate than the housing and are in greater contact with the hot gas than the housing, the blades heats up faster than the housing. This has the consequence that for starting and stopping the gas turbine, the blades and the housing have different thermal expansion speeds, so that when starting and stopping the gas turbine, the height of the radial gap changes, the radial gap smaller when starting and when driving large becomes. So that the blade tips of the rotor blades do not abut against the housing during start-up and damage it, the radial gap is provided with a minimum height dimensioned such that when the gas turbine starts up, the blade tips almost never touch the housing. This has the consequence that at the blade tips a correspondingly sized radial gap is kept, which leads to a reduction of the power density and the efficiency of the gas turbine.
- EP 1 057 969 A2 discloses, for example, a turbine blade with an airfoil, which has a "front-loaded design” or “intermediate-loaded design” on the hub side and a “rear-loaded design” on the tip side, as a result of which the distribution the rate of change in peripheral speed are taught.
- the object of the invention is to provide an axial turbine for a gas turbine, which has a high aerodynamic efficiency.
- the axial turbine according to the invention for a gas turbine has a rotor blade grid, which is formed by blades each having a leading edge, a trailing edge and a radially outer freestanding blade tip, an annular space wall enclosing the blade grid with an annular space inside, with which the annular space wall immediately adjacent to the blade tips forming the radial gap between the envelope of the blade tips and the annular space inside, wherein the blades at their blade tips between the leading edge and the trailing edge has a region with the highest pressure load of the blade tips, and wherein the blades each have a radial elevation in the region of highest pressure load as well as the annular space wall at the Annulus inside has a circumferential radial recess, which is the radial elevations opposite formed such that a gap width minimum in Hauptstromungs ⁇ chtung the axial turbine seen is located in the region of highest pressure loading.
- the pressure load in the sense of this document corresponds to the pressure difference between the suction ⁇ side and pressure side of
- the unfavorable, lossy gap current is reduced by using the blade tip, which is optimized directly with regard to minimum losses, and the annular space contour.
- the annular space in the region of the blade tip is designed as a contour deviating from the conventional annular space.
- the minimum gap width is arranged in the operation of the axial turbine in the region of the maximum pressure difference between the pressure side and the suction side of the run ⁇ scoop.
- the amount of leakage flow is directly targeted reduced and reduced their unfavorable impact on the overall efficiency of the blade lattice.
- he ⁇ gives, without having to provide additional design measures, an improved aerodynamic good of the blade shovel.
- Vorteihaft make the profile section on the blade tip contrary to the conventional interpretation as "front Be executed loaded design ". This means that the greatest pressure ⁇ load is from the rear part (hinterkantennah) of the blade in the area of the profile leading edge (vorderkantennah) moved. About the height of the rotor blade saw this area can be about 20%. The The remaining area of the blade can then be designed conventionally in the "rear-loaded design". The transition from "front-loaded design” to "rear-loaded design” at about 20% of the height of the rotor blade is preferably stepless.
- the radial recess is arranged in the front third.
- the radial recess is in the range of the highest
- the radial depression and the radial elevations are shaped in such a way that the course of the radial gap seen in the main flow direction of the axial turbine proceeds substantially equally far, wavy, edge-free and step-free.
- the course of the radial recess on the annular space inside seen in the main flow direction of the axial turbines has a first curved section, an adjoining second curved section and an adjoining third curved section, the first curved section of FIG the second Krummungsabterrorism is delimited with a first turning ⁇ point and the second Krummungsabterrorism is bounded by the third Krummungsabêt with a second turning point, so that the curvatures of the first Krummungs- section and the third Krummungsabites have the same Vor ⁇ sign, that of the sign the curvature of the second Krummungsabites is different.
- the size of the radial gap between the blade tip and Annular space wall - seen along the axial direction also be constant.
- the course of the radial elevations seen in the main flow direction of the axial radii is modeled on the course of the radial displacement at its sides facing the radial gap.
- the curvature of the first curving portion is larger than that of the third curving portion.
- the first inflection point is preferably located in the region of the front edge.
- the sections of the annular channel which are seen in the main flow direction of the axial turbine and which are adjacent to the radial depression upstream and downstream, are conical.
- FIG. 1 shows a profile section of a blade according to the invention in the area of the blade tip
- Figure 2 is a side view of an inventive axial turbine
- Figure 3 shows the side view of Figure 2 compared with a conventional axial turbine.
- an axial turbine 1 has a rotor blade 2 which has a front edge 3 and has a trailing edge 4.
- the rotor blade 2 has a pressure side 5 and a suction side 6, which each extend from the front edge 3 to the trailing edge 4.
- the pressure side 5 is lined with the suction side 6 strongly concave curved.
- the blade 2 has at its radially outer end a blade tip 13, which is exposed. In the region of the blade tip 13, the blade 2 is designed in the "front-loaded design" 7.
- the "rear-loaded design” 8 is shown in which the pressure side 5 is less curved in the region of the leading edge 3, as in the "front-loaded design" 7.
- the region 9 with the highest pressure loading of the blade 2 is located in the region of the blade tip 13 in the vicinity of the leading edge 3.
- the axial turbine 1 on the hub side, a hub contour 10, on which the rotor blade 2 is attached.
- the axial turbine 1 Radially outward, the axial turbine 1 has an annular space wall 11 which has an annular space inner side 12 facing the blade tip 13. With the annular space wall 11, the blade 2 is sheathed and forms with the annular space inside page 13 together with the hub contour 10 a divergent
- the annular space wall 11 is mainly -. apart from a radial recess 15 conical with a greater pitch than the hub contour 10th
- the blade 2 is also shown with a conventional blade tip 23 and the annular space wall 11 with a conventional annular space inside 24, wherein the conventional blade tip 23 and the conventional Ringrau- mmnenseite 24 have a straight course.
- a radial elevation 16 is provided on the blade tip 13. The radial elevation 16 runs essentially parallel to the radial recess 15, so that the radial gap 14 has a uniform course seen in the main flow direction of the axial turbine 1.
- the radial recess has a first curved section 17, an adjoining second curved section 19 and an adjoining third curved section 21.
- the first curvature portion 17 is delimited from the second curvature portion 19 with a first inflection point 18 and the second curvature portion 19 is delimited from the third curvature portion 21 by a second inflection point 20.
- the center of curvature of the first curved section 17 and of the third curved section 21 lies radially outside the axial turbine 1 and the center of curvature of the second curved section 19 within the axial turbine 1.
- the curvature of the first curvature portion 17 is greater than the curvature of the third curvature portion 21, so that the radial gap 14 in the region of the front edge 3 has a radially outward, steeper course than in the region of the third curvature portion 21.
- the radial depression 15 and the radial elevation 16 are arranged relative to one another such that a gap minimum 22 is formed in the region 9 of the highest pressure load.
- a leakage current which forms during operation of the axial turbine 1 through the radial gap 14 is exactly low in the region 9 with the highest pressure load.
- the moving blade 2 has a high aerodynamic efficiency, in particular in the area of the blade tip 13.
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
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011517874A JP5260740B2 (en) | 2008-07-17 | 2009-07-08 | Axial turbine for gas turbine with play defined between blade and housing |
CN200980128055.8A CN102099548B (en) | 2008-07-17 | 2009-07-08 | Axial turbine for a gas turbine with limited play between blades and housing |
US13/054,162 US20110188999A1 (en) | 2008-07-17 | 2009-07-08 | Axial turbine for a gas turbine with limited play between blades and housing |
EP09797468.7A EP2297430B1 (en) | 2008-07-17 | 2009-07-08 | Axial turbine for a gas turbine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08012960A EP2146054A1 (en) | 2008-07-17 | 2008-07-17 | Axial turbine for a gas turbine |
EP08012960.4 | 2008-07-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010006976A1 true WO2010006976A1 (en) | 2010-01-21 |
Family
ID=40010789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/058682 WO2010006976A1 (en) | 2008-07-17 | 2009-07-08 | Axial turbine for a gas turbine with limited play between blades and housing |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110188999A1 (en) |
EP (2) | EP2146054A1 (en) |
JP (1) | JP5260740B2 (en) |
CN (1) | CN102099548B (en) |
WO (1) | WO2010006976A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2694560C1 (en) * | 2018-09-12 | 2019-07-16 | Государственный научный центр Российской Федерации - федеральное государственное унитарное предприятие "Исследовательский Центр имени М.В. Келдыша" | Centripetal turbine |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201006449D0 (en) * | 2010-04-19 | 2010-06-02 | Rolls Royce Plc | Blades |
JP6012519B2 (en) * | 2013-03-21 | 2016-10-25 | 三菱重工業株式会社 | Turbine and rotating machine equipped with the same |
FR3010463B1 (en) * | 2013-09-11 | 2015-08-21 | IFP Energies Nouvelles | POLYPHASE PUMP IMPLUSTER WITH MEANS FOR AMPLIFYING AND DISTRIBUTING GAME FLOWS. |
GB201508763D0 (en) * | 2015-05-22 | 2015-07-01 | Rolls Royce Plc | Rotary blade manufacturing method |
CN108487942A (en) * | 2018-03-15 | 2018-09-04 | 哈尔滨工业大学 | Control the casing and blade combined shaping method of turbine blade-tip gap flowing |
BE1026579B1 (en) * | 2018-08-31 | 2020-03-30 | Safran Aero Boosters Sa | PROTUBERANCE VANE FOR TURBOMACHINE COMPRESSOR |
FR3089543B1 (en) * | 2018-12-05 | 2023-01-13 | Safran | Turbine or compressor rotor for a gas turbine engine with limited clearance losses |
CN114517794B (en) * | 2022-03-01 | 2024-07-09 | 大连海事大学 | Combined casing processing structure of transonic axial-flow compressor |
CN114962329B (en) * | 2022-05-27 | 2024-04-26 | 哈尔滨工程大学 | Compressor rotor clearance structure and application |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0726904A (en) * | 1993-07-12 | 1995-01-27 | Ishikawajima Harima Heavy Ind Co Ltd | Blade tip structure of rotating machine |
EP1253295A2 (en) * | 2001-04-27 | 2002-10-30 | Mitsubishi Heavy Industries, Ltd. | Axial-flow turbine having a stepped portion in a flow passage |
EP1267042A2 (en) * | 2001-06-14 | 2002-12-18 | Mitsubishi Heavy Industries, Ltd. | Shrouded gas turbine blade |
DE102004059904A1 (en) * | 2004-12-13 | 2006-06-14 | Alstom Technology Ltd | Moving blade e.g. for turbo machine, has blade point which faces stator in turbo machine and contacts into channel of stator with blade point provided in such way that blade contacts channel at its edges and into rotor |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR996967A (en) * | 1949-09-06 | 1951-12-31 | Rateau Soc | Improvement in turbine engine blades |
US4738586A (en) * | 1985-03-11 | 1988-04-19 | United Technologies Corporation | Compressor blade tip seal |
US4884820A (en) * | 1987-05-19 | 1989-12-05 | Union Carbide Corporation | Wear resistant, abrasive laser-engraved ceramic or metallic carbide surfaces for rotary labyrinth seal members |
US5639095A (en) * | 1988-01-04 | 1997-06-17 | Twentieth Technology | Low-leakage and low-instability labyrinth seal |
JP3118136B2 (en) * | 1994-03-28 | 2000-12-18 | 株式会社先進材料利用ガスジェネレータ研究所 | Axial compressor casing |
EP0903468B1 (en) * | 1997-09-19 | 2003-08-20 | ALSTOM (Switzerland) Ltd | Gap sealing device |
JP4086415B2 (en) * | 1999-06-03 | 2008-05-14 | 株式会社荏原製作所 | Turbine equipment |
US6338609B1 (en) * | 2000-02-18 | 2002-01-15 | General Electric Company | Convex compressor casing |
JP3927886B2 (en) * | 2002-08-09 | 2007-06-13 | 本田技研工業株式会社 | Axial flow compressor |
DE10352788A1 (en) * | 2003-11-12 | 2005-06-30 | Mtu Aero Engines Gmbh | gas turbine |
US7686567B2 (en) * | 2005-12-16 | 2010-03-30 | United Technologies Corporation | Airfoil embodying mixed loading conventions |
-
2008
- 2008-07-17 EP EP08012960A patent/EP2146054A1/en not_active Withdrawn
-
2009
- 2009-07-08 WO PCT/EP2009/058682 patent/WO2010006976A1/en active Application Filing
- 2009-07-08 EP EP09797468.7A patent/EP2297430B1/en not_active Not-in-force
- 2009-07-08 JP JP2011517874A patent/JP5260740B2/en not_active Expired - Fee Related
- 2009-07-08 CN CN200980128055.8A patent/CN102099548B/en not_active Expired - Fee Related
- 2009-07-08 US US13/054,162 patent/US20110188999A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0726904A (en) * | 1993-07-12 | 1995-01-27 | Ishikawajima Harima Heavy Ind Co Ltd | Blade tip structure of rotating machine |
EP1253295A2 (en) * | 2001-04-27 | 2002-10-30 | Mitsubishi Heavy Industries, Ltd. | Axial-flow turbine having a stepped portion in a flow passage |
EP1267042A2 (en) * | 2001-06-14 | 2002-12-18 | Mitsubishi Heavy Industries, Ltd. | Shrouded gas turbine blade |
DE102004059904A1 (en) * | 2004-12-13 | 2006-06-14 | Alstom Technology Ltd | Moving blade e.g. for turbo machine, has blade point which faces stator in turbo machine and contacts into channel of stator with blade point provided in such way that blade contacts channel at its edges and into rotor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2694560C1 (en) * | 2018-09-12 | 2019-07-16 | Государственный научный центр Российской Федерации - федеральное государственное унитарное предприятие "Исследовательский Центр имени М.В. Келдыша" | Centripetal turbine |
Also Published As
Publication number | Publication date |
---|---|
EP2146054A1 (en) | 2010-01-20 |
CN102099548A (en) | 2011-06-15 |
CN102099548B (en) | 2014-03-19 |
US20110188999A1 (en) | 2011-08-04 |
JP5260740B2 (en) | 2013-08-14 |
EP2297430A1 (en) | 2011-03-23 |
JP2011528082A (en) | 2011-11-10 |
EP2297430B1 (en) | 2013-08-28 |
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