EP0727564B1 - Schwingungsdämpfung für Turbinenschaufeln - Google Patents
Schwingungsdämpfung für Turbinenschaufeln Download PDFInfo
- Publication number
- EP0727564B1 EP0727564B1 EP96810059A EP96810059A EP0727564B1 EP 0727564 B1 EP0727564 B1 EP 0727564B1 EP 96810059 A EP96810059 A EP 96810059A EP 96810059 A EP96810059 A EP 96810059A EP 0727564 B1 EP0727564 B1 EP 0727564B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blades
- blade
- ring
- cover plates
- damping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000013016 damping Methods 0.000 title claims description 19
- 230000005291 magnetic effect Effects 0.000 claims description 20
- 230000010287 polarization Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 1
- 239000004020 conductor Substances 0.000 claims 1
- 239000003302 ferromagnetic material Substances 0.000 claims 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000007789 sealing 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
- F01D5/16—Form or construction for counteracting blade vibration
-
- 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
- F01D5/26—Antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
Definitions
- the invention relates to a device for damping Blade vibrations of an axially flowed turbomachine, where the ends of the rotating blades against the sealing the flow-limiting wall of a turbine housing.
- the rotating blades are for a specific one Field of operating conditions designed without resonance. Due to varying operating conditions, e.g. Changes in volume flow of the flowing work equipment or back pressure operation in the border area, the blades become vibrations stochastically excited. In the case of vibration resonance, these lead mechanical stresses for blade failure.
- the invention has for its object a device for vibration damping for turbine blades at the beginning shown type, in which each shovel individually and is steamed smoothly.
- the advantages of the invention can be seen, inter alia, in the fact that the blades are not coupled to contact surfaces of damping devices rubbing against one another, such as cover plates, damper wires or bolts.
- the blades are individually damped without friction and thus free of wear. It is also advantageous that, when axially installed in a turbine wheel, the assembly of individual blades is simplified, since no tangential damping structures of adjacent blades overlap one another.
- blade cover plates be made of aluminum, because with this choice of material good electrical properties with low specific Connect weight. Centrifugal forces in the order of magnitude, as they occur with known cover plate damping because of the much smaller and therefore lighter cover plate construction of the invention reduced to. this means reduced mechanical stress for the turbine blade.
- FIG. 1 shows a section of a turbine housing 1, which is radially opposite a blade end 8 of a turbine rotor blade 2.
- the blade shown is an end blade, for example an LP steam turbine.
- a ring 4 made of permanent magnetic material is attached at a designated point on the turbine housing 1 around a not shown, bladed turbine wheel.
- This magnetic ring 4 consists of partial rings 6, which are combined in a housing 5 made of austenitic steel and fastened with this in the turbine housing 1.
- the magnetic ring 4 is divided into three partial rings 6 with alternating magnetic polarization 7a, b, c, the polarization scheme SNS being present.
- the turbine blade 2 which is located radially opposite the magnetic ring 4, has a cover plate 3 at its blade end 8, as shown in FIG. 2.
- this cover plate 3 When viewed from the top, this cover plate 3 has approximately the shape of a rhombus, the acute-angled corners of which are flattened parallel to the direction of rotation 9 of the turbine blades 2 .
- the blades 2 are free-standing, ie the cover plates 3 of adjacent blades 2 are dimensioned such that they are not tangentially overlapping and do not touch one another.
- a preferred alloy for the permanent magnet ring 4 is cobalt samarium (Co-Sm). Because of its good electrical properties and the low specific weight for metals, it is advantageous to manufacture the blade cover plate 3 from aluminum. The low specific weight enables the cover plate 3 of the blades 2 subjected to centrifugal force to be made light. The good electrical conductivity of the aluminum favors the eddy currents and thus, as mentioned above, the damping behavior.
- the invention is not limited to the exemplary embodiment shown and described.
- the number of partial rings 6 involved in the magnetic ring 4 and their magnetic polarization 7a, b, c are also conceivable in a different configuration, although a different magnet material could also be preferred to the Co-Sm.
- the partial rings 6 can also be designed as electrically fed toroidal coils.
- the design of the blade cover plate 3 is also conceivable from a material other than aluminum. Taking into account the higher specific weight of ferromagnetic metals and their alloys, these materials are also extremely suitable for the production of the cover plates. Their magnetic properties are outstanding here, which means a considerable reduction in the magnetic air gap between a cover plate and the flow-limiting wall. The dissipated vibration energy can thus be increased by favoring the magnetic flux in the cover plate.
- the invention can also be used in a damping manner in the case of shroud-wheel-bound paddle wheels.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Vibration Prevention Devices (AREA)
Description
Derartige Einrichtungen für die Dämpfung von Schaufelschwingungen sind bekannt aus DE B 1 299 004 und US 3 185 441. Dabei sind die Einsatzbereiche der vorgeschlagenen Dämpfungsmittel beschränkt. Bohrungen für die Aufnahme von Dämpferdrähten oder Dämpferbolzen beeinträchtigen die Festigkeit der Schaufelprofile, und die Dämpferdrähte und -bolzen selbst verschlechtern die Strömungseigenschaften des strömenden Arbeitmittels.
Hohe Fliehkräfte treten nachteilig ins Gewicht bei der Dämpfung mittels Schaufeldeckplatten, die benachbarte Schaufelköpfe zu einem geschlossenen Ring aneinanderkoppeln und durch Reibschluss dämpfend wirken. Die Ausführung und Bearbeitung dieser Schaufeldeckplatten, sowie die Schaufelmontage mit diesen Deckplatten ist wegen der geforderten Massgenauigkeit aufwendig und teuer.
Hinzu kommt, dass bei den Dämpfungseinrichtungen, die auf Reibschluss benachbarter Schaufeln basieren, durch eine Abnützung der Kontaktflächen, die geforderte Dämpfung beeinträchtigt wird und somit Revisionen nötig sind.
Vorteilhaft ist ferner, dass bei axialem Einbau in ein Turbinenrad die Montage einzelner Schaufeln vereinfacht ist, da keine tangentialen Dämpfungskonstruktionen benachbarter Schaufeln einander überlappen.
Es zeigen:
- Fig.1
- einen Teillängsschnitt einer Schaufelspitze mit einem radial gegenüberliegenden Magnetring;
- Fig.2
- einen Schnitt nach Linie II-II gemäss Fig.1.
Nicht dargestellt in der Zeichnung ist ein Turbinenschaufelfuss und eine Montageansicht der Schaufel in einem Turbinenrad.
Die dem Magnetring 4 radial gegenüberliegende Turbinenschaufel 2 hat an deren Schaufelende 8, wie Fig. 2 zeigt, eine Deckplatte 3. Diese Deckplatte 3 weist bei radialer Draufsicht annähernd die Form eines Rhombus auf, dessen spitzwinklige Ecken parallel zur Rotationsrichtung 9 der Turbinenschaufeln 2 abgeflacht sind. Die Schaufeln 2 sind freistehend, d.h., die Deckplatten 3 benachbarter Schaufeln 2 sind so bemessen, dass sie tangential nicht überlappend sind und einander nicht berühren.
Wegen seiner guten elektrischen Eigenschaften und dem für Metalle geringen spezifischen Gewicht ist es von Vorteil, die Schaufeldeckplatte 3 aus Aluminium zu fertigen.
Das geringe spezifische Gewicht ermöglicht eine leichte Ausführung der Deckplatte 3 der fliehkraftbelasteten Schaufeln 2. Die gute elektrische Leitfähigkeit des Aluminiums begünstigt die Wirbelströme und damit, wie oben erwähnt, das Dämpfungsverhalten.
Weiterhin sind die Teilringe 6 auch als elektrisch gespeiste Ringkernspulen ausführbar.
Im Sinne der Erfindung ist die Ausführung der Schaufeldeckplatte 3 auch aus einem anderen Material als Aluminium denkbar. Unter Inkaufnahme des höheren spezifischen Gewichts von ferromagnetischen Metallen und ihren Legierungen, eignen sich diese Materialien ebenfalls ausserordentlich gut für die Fertigung der Deckplatten. Herausragend sind hier ihre magnetischen Eigenschaften, welche eine erhebliche Verkleinerung des magnetischen Luftspalts zwischen einer Deckplatte und der strömungsbegrenzenden Wand bedeutet. Die dissipierte Schwingungsenergie kann somit durch eine Begünstigung des magnetischen Flusses in der Deckplatte erhöht werden. Selbstverständlich kann die Erfindung auch bei deckbandgebundenen Schaufelrädern zusätzlich dämpfend eingesetzt werden.
- 1
- Turbinengehäuse
- 2
- Schaufel
- 3
- Schaufeldeckplatte
- 4
- Ring aus permanentmagnetischem Material
- 5
- austenistisches Stahlgehäuse
- 6
- permanentmagnetischer Teilring
- 7a,c
- magnetische Polarisation S eines Teilrings
- 7b
- magnetische Polarisation N eines Teilrings
- 8
- Schaufelende
- 9
- Rotationsrichtung der Turbinenschaufeln in radialer Draufsicht
- 10
- Magnetfeldlinien des Permanentmagnetringes
Claims (6)
- Einrichtung zur Dämpfung von Schaufelschwingungen einer axial durchströmten Turbomaschine, bei welcher die Enden (8) der rotierenden Schaufeln (2) gegen die strömungsbegrenzende Wand eines Turbinengehäuses (1) dichten,
dadurch gekennzeichnet,dass auf der strömungsbegrenzenden Wand des Turbinengehäuses (1) in radialer Richtung gegenüber den Schaufelenden (8) ein Ring (4) aus permanentmagnetischem Material angebracht ist, der aus mindestens einem oder mehreren Teilringen (6) gleicher oder unterschiedlicher magnetischer Polarisation (7a,b) besteht, unddass die Schaufelenden (8) mit je einer Deckplatte (3) versehen sind, welche aus einem elektrisch gut leitenden Material besteht. - Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,dass der Permanentmagnetring (4) aus drei Teilringen (6) besteht mit dem Polarisationsschema NSN oder SNS, unddass dieser Permanentmagnetring (4) von einem nichtmagnetischen Gehäuse (5) umgeben ist. - Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
dass benachbarte Deckplatten (3) der Schaufeln (2) einander nicht berühren. - Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
dass die Deckplatten (3) der Schaufeln (2) aus Aluminium gefertigt sind. - Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
dass die Deckplatten (3) der Schaufeln (2) aus einem ferromagnetischen Material gefertigt sind. - Verwendung der Einrichtung nach Anspruch 1 bei Turbomaschinen mit freistehenden Schaufeln (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19505389A DE19505389A1 (de) | 1995-02-17 | 1995-02-17 | Schwingungsdämpfung für Turbinenschaufeln |
DE19505389 | 1995-02-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0727564A1 EP0727564A1 (de) | 1996-08-21 |
EP0727564B1 true EP0727564B1 (de) | 1998-11-04 |
Family
ID=7754243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96810059A Expired - Lifetime EP0727564B1 (de) | 1995-02-17 | 1996-01-29 | Schwingungsdämpfung für Turbinenschaufeln |
Country Status (10)
Country | Link |
---|---|
US (1) | US5709527A (de) |
EP (1) | EP0727564B1 (de) |
JP (1) | JPH08240103A (de) |
KR (1) | KR960031759A (de) |
CN (1) | CN1140230A (de) |
CA (1) | CA2162933A1 (de) |
DE (2) | DE19505389A1 (de) |
ES (1) | ES2126374T3 (de) |
HU (1) | HU218551B (de) |
PL (1) | PL312681A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2072755A1 (de) | 2007-12-21 | 2009-06-24 | Siemens Aktiengesellschaft | Magnetische Vorrichtung zur Dämpfung von Schaufelschwingungen bei Strömungsmaschinen |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6422813B1 (en) * | 1999-09-03 | 2002-07-23 | Hood Technology Corporation | Apparatus for producing vibration in turbo-machinery blades |
US6607359B2 (en) | 2001-03-02 | 2003-08-19 | Hood Technology Corporation | Apparatus for passive damping of flexural blade vibration in turbo-machinery |
US6796408B2 (en) * | 2002-09-13 | 2004-09-28 | The Boeing Company | Method for vibration damping using superelastic alloys |
GB0410778D0 (en) * | 2004-05-13 | 2004-06-16 | Rolls Royce Plc | Blade arrangement |
KR100621514B1 (ko) * | 2004-12-17 | 2006-09-19 | (주)오토씨에프티 | 경첩 |
US7270517B2 (en) * | 2005-10-06 | 2007-09-18 | Siemens Power Generation, Inc. | Turbine blade with vibration damper |
EP2253801A1 (de) | 2009-05-12 | 2010-11-24 | Alstom Technology Ltd | Rotorschaufel mit Schwingungsdämpfungssystem |
CH704127A1 (de) | 2010-11-24 | 2012-05-31 | Alstom Technology Ltd | Verfahren zum beeinflussen, insbesondere dämpfen bzw. unterdrücken von während des betriebes auftretenden mechanischen schwingungen in einer turbomaschinenschaufel, turbomaschinenschaufel zur durchführung des verfahrens sowie piezoelektrisches dämpfungselement zum einbau in eine solche turbomaschinenschaufel. |
DE102012201048B4 (de) * | 2012-01-25 | 2014-03-27 | MTU Aero Engines AG | Verfahren und Dämpfungseinrichtung zur Schwingungsdämpfung einer Schaufel einer Strömungsmaschine, sowie Strömungsmaschine |
US8915718B2 (en) * | 2012-04-24 | 2014-12-23 | United Technologies Corporation | Airfoil including damper member |
JP6236723B2 (ja) * | 2013-09-04 | 2017-11-29 | 公益財団法人鉄道総合技術研究所 | 振動減衰装置及び振動減衰装置を備えた電力貯蔵装置 |
EP3000976A1 (de) * | 2014-09-29 | 2016-03-30 | Siemens Aktiengesellschaft | Verfahren zum Beeinflussen eines Schwingungszustands eines Läuferbauteils, zugehörige System und Fluidenergiemaschine |
CN104455180A (zh) * | 2014-10-16 | 2015-03-25 | 浙江省海运集团舟山五洲船舶修造有限公司 | 轮机细长轴稳定包套 |
JP6380845B2 (ja) * | 2014-12-22 | 2018-08-29 | 三菱日立パワーシステムズ株式会社 | 回転機械 |
US10371050B2 (en) * | 2014-12-23 | 2019-08-06 | Rolls-Royce Corporation | Gas turbine engine with rotor blade tip clearance flow control |
US10465544B2 (en) | 2017-07-24 | 2019-11-05 | United Technologies Corporation | Eddy current damper for lift off seal |
US10822965B2 (en) * | 2018-03-26 | 2020-11-03 | General Electric Company | Active airfoil vibration control |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA489861A (en) * | 1953-01-20 | Rolls-Royce Limited | Compressor systems | |
GB689901A (en) * | 1949-10-25 | 1953-04-08 | Honorary Advisory Council Sci | Improvements in or relating to electrical heating of rotary compressors |
US2853638A (en) * | 1957-01-11 | 1958-09-23 | Gen Motors Corp | Inductor generator |
DE1159965B (de) * | 1961-08-10 | 1963-12-27 | Bbc Brown Boveri & Cie | Einrichtung zur Schwingungsdaempfung an einem Turbinen- oder Verdichter-Schaufelkranz |
DE1299004B (de) * | 1965-01-19 | 1969-07-10 | Bbc Brown Boveri & Cie | Einrichtung zur Schwingungsdaempfung an einem Turbinen-oder Verdichterschaufelkranz |
SU601436A1 (ru) * | 1976-11-19 | 1978-04-05 | Kontautas Romuald K | Преобразователь частоты вращени ротора |
DE2825400C2 (de) * | 1978-06-09 | 1984-02-02 | Omya Gmbh, 5000 Koeln | Trennmaschine |
SU1109540A1 (ru) * | 1983-07-18 | 1984-08-23 | Институт Горного Дела Со Ан Ссср | Устройство дл контрол режима работы вентил тора |
JPS61108802A (ja) * | 1984-11-02 | 1986-05-27 | Mitsubishi Heavy Ind Ltd | 流体回転機械 |
DE3667521D1 (de) * | 1985-08-31 | 1990-01-18 | Bbc Brown Boveri & Cie | Einrichtung zur daempfung von schaufelschwingungen bei turbomaschinen. |
DE3741451A1 (de) * | 1986-12-10 | 1988-06-23 | Nippon Seiko Kk | Hydrostatisches lagersystem |
DE59205948D1 (de) * | 1991-10-17 | 1996-05-15 | Asea Brown Boveri | Vorrichtung und Verfahren zum Reduzieren einer oder mehrerer resonanter Schwingungen von Laufschaufeln in Turbomaschinen |
US5490759A (en) * | 1994-04-28 | 1996-02-13 | Hoffman; Jay | Magnetic damping system to limit blade tip vibrations in turbomachines |
-
1995
- 1995-02-17 DE DE19505389A patent/DE19505389A1/de not_active Withdrawn
- 1995-11-15 CA CA002162933A patent/CA2162933A1/en not_active Abandoned
- 1995-11-16 US US08/558,858 patent/US5709527A/en not_active Expired - Fee Related
- 1995-12-15 KR KR1019950050708A patent/KR960031759A/ko not_active Application Discontinuation
- 1995-12-20 HU HU9503685A patent/HU218551B/hu not_active IP Right Cessation
-
1996
- 1996-01-29 EP EP96810059A patent/EP0727564B1/de not_active Expired - Lifetime
- 1996-01-29 DE DE59600750T patent/DE59600750D1/de not_active Expired - Fee Related
- 1996-01-29 ES ES96810059T patent/ES2126374T3/es not_active Expired - Lifetime
- 1996-02-07 PL PL96312681A patent/PL312681A1/xx unknown
- 1996-02-14 JP JP8026669A patent/JPH08240103A/ja active Pending
- 1996-02-14 CN CN96101417A patent/CN1140230A/zh active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2072755A1 (de) | 2007-12-21 | 2009-06-24 | Siemens Aktiengesellschaft | Magnetische Vorrichtung zur Dämpfung von Schaufelschwingungen bei Strömungsmaschinen |
US8568088B2 (en) | 2007-12-21 | 2013-10-29 | Siemens Aktiengesellschaft | Magnetic device for damping blade vibrations in turbomachines |
Also Published As
Publication number | Publication date |
---|---|
JPH08240103A (ja) | 1996-09-17 |
CN1140230A (zh) | 1997-01-15 |
PL312681A1 (en) | 1996-08-19 |
KR960031759A (ko) | 1996-09-17 |
US5709527A (en) | 1998-01-20 |
HU9503685D0 (en) | 1996-02-28 |
DE19505389A1 (de) | 1996-08-22 |
HU218551B (hu) | 2000-10-28 |
ES2126374T3 (es) | 1999-03-16 |
EP0727564A1 (de) | 1996-08-21 |
HUT76395A (en) | 1997-08-28 |
DE59600750D1 (de) | 1998-12-10 |
CA2162933A1 (en) | 1996-08-18 |
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