EP2677123B2 - Diffusor für Turbomaschinen - Google Patents
Diffusor für Turbomaschinen Download PDFInfo
- Publication number
- EP2677123B2 EP2677123B2 EP12172393.6A EP12172393A EP2677123B2 EP 2677123 B2 EP2677123 B2 EP 2677123B2 EP 12172393 A EP12172393 A EP 12172393A EP 2677123 B2 EP2677123 B2 EP 2677123B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- diffuser
- straight
- section
- wall
- vertical cross
- 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.)
- Active
Links
- 238000011084 recovery Methods 0.000 description 6
- 238000005457 optimization Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
-
- 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
Definitions
- the present invention relates to improvements to a diffuser for a turbomachine. It is particularly, but not exclusively, relevant to the diffuser following the last stage of a low pressure (LP) steam turbine.
- LP low pressure
- Diffusers as found in large steam turbines are used for example to guide the steam from the last stage of the turbine to a condenser.
- a diffuser has two or more essentially concentric walls arranged at least initially with an axial orientation around the rotor axis of the turbine.
- the diffuser following the last stage has tasks of decelerating the flowing medium, increasing the usable pressure or enthalpy drop across the turbines, converting a proportion of the kinetic energy to pressure energy and reducing flow losses at the diffuser outlet toward the condenser groups. It is hence clear that the design of the diffuser contributes to the overall efficiency of a turbine machine and for that reason many efforts have been made to optimize the diffuser layout.
- the straight lines can be formed as a sequence of kinks in the wall of the diffuser to deliberately cause flow separation from the wall.
- the configuration allows shock boundary layer pulsations to be suppressed.
- the measure may be associated with a considerable reduction in the diffuser efficiency.
- a further example of a diffuser comprising straight parts is provided in European Patent application EP1921278A . As discussed in this application, it may be advantagoues to geometrically smooth the curves created by the straight parts.
- a yet further example is provided by U.S patent publication no. 3802187 .
- the exhaust comprises a concial shaped diffuser connected to an elbow duct having an elliptical shaped outlet.
- a diffuser according to A claim 1.
- the 2 nd order elliptical curve is a segment of an ellipse but excluding circle segments.
- FIG. 1 there is shown a schematic vertical cross-section of a diffuser for a low pressure steam turbine stage as proposed in the GT2011 publication as referenced above.
- the figure shows a cross-section of the upper half of an essentially rotationally symmetrical diffuser. It also shows a part of the rotor 10 and of the inner casing 11. Between the rotor and the casing and attached to one, respectively, are rotating blades and stator blades.
- the last stage of the turbine includes a circumferential arrangement of stator blades 111 attached to the casing 11 and a circumferential arrangement of rotating blades 101 attached to the rotor 10.
- the diffuser 12 Following the last stage 111 , 101 is the diffuser 12 . It has an outer wall 121 and an inner wall 122 , which together form an annular conduit guiding the steam to a condenser (not shown).
- the enlarged detail of FIG. 1 shows a part of the outer wall 121 of the diffuser and illustrates the parameters which can be used to optimize the diffuser for a given turbine and steam flow.
- the wall Following the direction of the steam flow, the wall has first straight part of length I1 followed by a second straight part of length I2 .
- the second straight part forms an angle ⁇ 1 with respect to a horizontal line, i.e. in axial direction.
- the two straight parts are followed by a curved part.
- the curved part has an angle ⁇ 2 with respect to a horizontal line at its entry and a radius of R and an angle ⁇ 3 with respect to a horizontal line at its exit.
- the arc is followed by another essentially straight section with the length I3 in direction of the exit 123.
- all the parameters shown can be altered in order to configure an optimized diffuser 12.
- FIG. 2 a modified diffuser in accordance with an example of the invention is shown overlaid over the diffuser of FIG. 1 (shown as dashed lines 121 ).
- the new diffuser has a higher number of straight parts (3 over 4) and a higher order curve 21 following the straight parts.
- the curve 21 is essentially an elliptical curve.
- the elliptical shape 21 has a higher curvature at the beginning or entry and flares out into a flatter part towards the exit 123 compared to the circular curve 121 (dashed).
- Other numerals in FIG. 2 are the same as in FIG. 1 . when denoting identical or similar elements.
- FIG. 3 A comparison of the efficiency of the two designs of FIG. 2 is shown in FIG. 3 illustrating the slice diffuser recovery.
- the graph is a plot of the recovery Chi between the diffuser inlet (last stage blade exit) and the diffuser exit (2R plane)over the medium speed in axial direction C z ⁇ in m/s at the diffuser inlet.
- the upper line illustrates the recovery of the new diffuser. This recovery is at least 3 per cent above the line of a known diffuser as shown in FIG. 1 . From this comparison it becomes clear that hybrid diffusers in accordance with the invention have the potential to improve diffuser recovery in a significant manner.
- the hybrid diffuser with 4 or more straight parts followed by an elliptical can be regarded as the one with a better improvement potential than the prior art diffuser of FIG. 1 .
- a diffuser with a higher number of straight parts and their respective lengths angles between them followed by a curve of the general shape a 11 x 2 + a 12 xy + a 22 y 2 + 2 a 13 x + 2 a 23 y + a 33 0 with at least one mixed coefficient not being zero has a higher potential of being further improved than the more limited designs following the prior art.
- Such optimisation can be made using any of the known tools such as ANSYS CFX or other methods as described in the above referenced GT2011 publication.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Claims (2)
- Ein Diffusor nach der letzten Stufe einer Turbine, der eine äußere Wand (121) mit einem Eintrittsabschnitt einschließlich, an einem vertikalen Querschnitt, mehrerer nachfolgender gerader Wandteile, die in einem Winkel zueinander stehen, hat, dadurch gekennzeichnet, dass den geraden Wandteilen am vertikalen Querschnitt ein gekrümmter Wandteil folgt, wobei der gekrümmte Abschnitt die geraden Abschnitte mit einer Diffusorlippe oder einem Diffusorausgang verbindet und eine elliptische Kurve der Ordnung 2 am vertikalen Querschnitt hat.
- Der Diffusor nach Anspruch 1, wobei die Anzahl von geraden Teilen vier oder mehr beträgt.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12172393.6A EP2677123B2 (de) | 2012-06-18 | 2012-06-18 | Diffusor für Turbomaschinen |
US13/919,332 US20130336783A1 (en) | 2012-06-18 | 2013-06-17 | Diffuser for turbomachines |
CN201310240850.4A CN103511008B (zh) | 2012-06-18 | 2013-06-18 | 用于涡轮机的扩散器 |
JP2013127715A JP5726236B2 (ja) | 2012-06-18 | 2013-06-18 | ターボ機械用のディフューザ |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12172393.6A EP2677123B2 (de) | 2012-06-18 | 2012-06-18 | Diffusor für Turbomaschinen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2677123A1 EP2677123A1 (de) | 2013-12-25 |
EP2677123B1 EP2677123B1 (de) | 2014-10-08 |
EP2677123B2 true EP2677123B2 (de) | 2018-04-25 |
Family
ID=46318990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12172393.6A Active EP2677123B2 (de) | 2012-06-18 | 2012-06-18 | Diffusor für Turbomaschinen |
Country Status (4)
Country | Link |
---|---|
US (1) | US20130336783A1 (de) |
EP (1) | EP2677123B2 (de) |
JP (1) | JP5726236B2 (de) |
CN (1) | CN103511008B (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7458947B2 (ja) * | 2020-09-15 | 2024-04-01 | 三菱重工コンプレッサ株式会社 | 蒸気タービン |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2960306A (en) * | 1956-01-16 | 1960-11-15 | Gen Motors Corp | Turbine |
GB1050879A (de) * | 1965-01-28 | |||
US3802187A (en) * | 1972-06-01 | 1974-04-09 | Avco Corp | Exhaust system for rear drive engine |
US4344737A (en) * | 1978-01-30 | 1982-08-17 | The Garrett Corporation | Crossover duct |
DE3206626A1 (de) * | 1982-02-24 | 1983-09-01 | Kraftwerk Union AG, 4330 Mülheim | Abgaskanal fuer gasturbinen |
AT383396B (de) * | 1984-08-17 | 1987-06-25 | Proizv Ob Turbostroenia | Niederdruckzylinder einer dampfturbine |
GB9415685D0 (en) * | 1994-08-03 | 1994-09-28 | Rolls Royce Plc | A gas turbine engine and a diffuser therefor |
DE19905994A1 (de) | 1999-02-15 | 2000-08-24 | Peter Kraus | Vorrichtung und Verfahren zur Aufhebung von Stoß-Grenzschicht-Oszillationen bei kreisringförmigen Diffusoren (axial-radial) an Dampfturbinen |
EP1921278A1 (de) * | 2006-11-13 | 2008-05-14 | ALSTOM Technology Ltd | Diffusor-und Abdampfsystem für Turbine |
US8475125B2 (en) * | 2010-04-13 | 2013-07-02 | General Electric Company | Shroud vortex remover |
US8591185B2 (en) * | 2010-11-16 | 2013-11-26 | General Electric Company | Low pressure exhaust gas diffuser for a steam turbine |
-
2012
- 2012-06-18 EP EP12172393.6A patent/EP2677123B2/de active Active
-
2013
- 2013-06-17 US US13/919,332 patent/US20130336783A1/en not_active Abandoned
- 2013-06-18 CN CN201310240850.4A patent/CN103511008B/zh active Active
- 2013-06-18 JP JP2013127715A patent/JP5726236B2/ja active Active
Also Published As
Publication number | Publication date |
---|---|
EP2677123A1 (de) | 2013-12-25 |
JP5726236B2 (ja) | 2015-05-27 |
US20130336783A1 (en) | 2013-12-19 |
EP2677123B1 (de) | 2014-10-08 |
CN103511008B (zh) | 2015-07-15 |
JP2014001735A (ja) | 2014-01-09 |
CN103511008A (zh) | 2014-01-15 |
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