EP2268900A1 - Blade for a rotating thermal engine - Google Patents
Blade for a rotating thermal engineInfo
- Publication number
- EP2268900A1 EP2268900A1 EP09724433A EP09724433A EP2268900A1 EP 2268900 A1 EP2268900 A1 EP 2268900A1 EP 09724433 A EP09724433 A EP 09724433A EP 09724433 A EP09724433 A EP 09724433A EP 2268900 A1 EP2268900 A1 EP 2268900A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- airfoil
- angle
- trailing edge
- flow lines
- 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.)
- Ceased
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
- F01D5/141—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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
-
- 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
- F05D2240/00—Components
- F05D2240/10—Stators
- F05D2240/12—Fluid guiding means, e.g. vanes
- F05D2240/122—Fluid guiding means, e.g. vanes related to the trailing edge of a stator vane
-
- 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
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
-
- 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
- F05D2250/00—Geometry
- F05D2250/70—Shape
Definitions
- the present invention relates to the field of thermal machines. It relates to a blade for a rotary thermal machine according to the preamble of claim 1.
- Fig. 1 shows a gas turbine 10 with sequential combustion, in which along a shaft 19, a compressor 11, a first combustion chamber 14, a high-pressure turbine 15, a second combustion chamber 17 and a low-pressure turbine 18 are arranged in order.
- the compressor 1 1 and the two turbines 15 (HD), 18 (ND) are part of a rotor which rotates about the axis 19.
- the compressor 1 1 compresses the intake air, this compressed air then flows into a plenum and from there into the first combustion chamber.
- This combustion chamber is with Premix burners operated, as they emerge for example from EP-A1 -0 321 809, further also from EP-A2-0 704 657.
- the compressed air flows into the premix burners where mixing with at least one fuel takes place.
- This fuel / air mixture then flows into the first combustion chamber 14, in which this mixture passes to form a stable flame front for combustion.
- the resulting hot gas is partially expanded in the subsequent high-pressure turbine 15 under work performance and then flows into the second combustion chamber 17, where a further fuel supply 16 takes place. Due to the high temperatures, which still has the hot gas partially released in the high-pressure turbine 15, combustion takes place in the second combustion chamber 17, which combustion is based on autoignition.
- the hot gas reheated in the second combustion chamber 17 is then expanded in a multistage low-pressure turbine 18, in which blade rows of blades and vanes are alternately arranged in succession.
- the low-pressure turbine 18 includes a blading 29 in which a plurality of rows of blades and vanes are arranged behind one another and alternately in the flow direction.
- the vanes have an airfoil (22 in Fig. 2) extending radially between a cover plate (21 in Fig. 2) and a blade head (23 in Fig. 2).
- Both ends (21, 23) of the guide blade define in the radial direction the flow cross-section of a hot gas channel through which a hot gas stream (30 in FIG. 2) flows and impeller blade 22 of the blade is supplied with corresponding flow lines, of which three flow lines in FIG located and provided with the reference numeral 26 are.
- the flow cross section of the hot gas duct widens significantly in the flow direction in the manner of a turbine.
- the airfoils of guide vanes in gas turbines or steam turbines are designed so that the local flow lines the flowing working medium (hot gas or steam) at the intersection with the trailing edge of the airfoil extend approximately perpendicular to the trailing edge.
- the trailing edge can not be completely and consistently oriented perpendicular to the flow lines, because this would require a strong sweeping and tilting, for example on the blade tip, but not possible because of the space available and the assembly is, apart from the fact that such a configuration, even if accomplish this Hesse, would otherwise have serious fluidic disadvantages.
- the invention aims to remedy this situation. It is an object of the invention to provide a blade, which has a fluidically optimal
- Body has within the predetermined flow cross-section, and this at a maximized efficiency.
- Essential to the invention is a shape of the airfoil, in which the
- the angle formed by the flow lines with the trailing edge of the airfoil deviates to a limited extent from a right angle, as would be the case with a constant flow cross section, wherein the mentioned angle, ie the flow lines with the trailing edge of the airfoil, in particular, but not exclusively, smaller than 90 °, ie in certain cases the angle can be greater than 90 °.
- a proven embodiment of the invention is characterized in that the deviation with respect to this angle, which form the flow lines with the trailing edge of the airfoil, in the range between 0 ° and -10 ° resp. + 10 ° to a right angle.
- the deviation of the angle that the flow lines with the trailing edge of the Formed over the largest portion of the height of the airfoil in the range between O ° and -5 ° and possibly between O ° and + 5 ° the deviations within the angular range must not be uniform over the entire blade length, ie the flow lines must do not have the same size deviation within certain flow sections along the blade length. Also, an oscillating deviation within the underlying angular range along the entire blade length is possible.
- FIG. 2 shows a perspective side view of a guide blade, for example for use in a gas turbine according to FIG. 1, and furthermore according to a preferred embodiment of the invention, FIG.
- Fig. 3 shows the deviation of the angle
- Trailing edge of a comparable to Fig. 2 blade form from the right angle above the blade height when the blade has a completely rectangular “stacking" and Fig. 4 shows the deviation of the angle, the flow lines with the
- Trailing edge of the blade shown in Fig. 2 form, from the right angle to the blade height according to an embodiment of the invention.
- FIG. 2 shows a typical vane conventionally used in a turbine of a gas turbine group, for example in the low pressure turbine of a gas turbine with sequential combustion, as shown in FIG.
- the guide vane 20 comprises a relatively strongly curved airfoil 22 in the space that extends in the longitudinal direction (in the radial direction relative to the rotor of the gas turbine) between a vane head 23 and a cover plate 21 and in the flow direction of the hot gas stream 30 of a
- Leading edge 27 extends to a trailing edge 28. Between the two edges 27 and 28, the airfoil 22 is bounded to the outside by a suction side 31 and an (opposite) pressure side (not visible in Fig. 2).
- the hot gas stream 30 flows from the leading edge 27 to the trailing edge 28 on the airfoil 22 along flow lines 26, of which three such flow lines are shown by way of example in FIG. are symbolized.
- the flow lines 26 At their intersection with the trailing edge 28, the flow lines 26 each form an angle ⁇ which changes in the radial direction and thus establishes a dependence on the height h of the airfoil 22.
- this angle ⁇ over the entire height of the airfoil 22 is equal to 90 °, this would correspond to a complete right-angled filling ("filling orthogonal stacking") of the blade, accordingly the value 0 would result for the deviation ⁇ -90 ° from the right angle. as shown in the diagram of Fig. 3, in which the function ⁇ -90 ° (h) is shown.
- this fully right-angled threading is replaced by a less stringent "softened" orthogonal stacking, in which the angle ⁇ remains close to a right angle but can deviate to a limited extent from it.
- the diagram corresponding to Fig. 3 for such a "softened" right-angled threading is shown in Fig. 4.
- the deviation ⁇ -90 ° of the angle ⁇ from the right angle is in the negative range ( ⁇ 0) and in the present example is all to one Angular range between 0 and -10 ° limited ..
- the deviation starts with a maximum value of almost -10 °, then goes back to zero within a very short distance and remains in the present example over most of the height below -5 ° .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH4672008 | 2008-03-28 | ||
PCT/EP2009/052533 WO2009118234A1 (en) | 2008-03-28 | 2009-03-04 | Blade for a rotating thermal engine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2268900A1 true EP2268900A1 (en) | 2011-01-05 |
Family
ID=39870460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09724433A Ceased EP2268900A1 (en) | 2008-03-28 | 2009-03-04 | Blade for a rotating thermal engine |
Country Status (3)
Country | Link |
---|---|
US (1) | US20110038733A1 (en) |
EP (1) | EP2268900A1 (en) |
WO (1) | WO2009118234A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2014370386C1 (en) | 2013-12-23 | 2021-11-18 | Cytec Industries Inc. | Polyacrylonitrile (PAN) polymers with low polydispersity index (PDI) and carbon fibers made therefrom |
PL415835A1 (en) * | 2016-01-18 | 2017-07-31 | General Electric Company | Blade assembly of a compressor for the gas turbine engine and method to control the leak stream through the sealing around the blade assembly of a compressor for the gas turbine engine |
US11566530B2 (en) | 2019-11-26 | 2023-01-31 | General Electric Company | Turbomachine nozzle with an airfoil having a circular trailing edge |
US11629599B2 (en) | 2019-11-26 | 2023-04-18 | General Electric Company | Turbomachine nozzle with an airfoil having a curvilinear trailing edge |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2899128A (en) * | 1959-08-11 | Vaghi |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US850200A (en) * | 1905-11-28 | 1907-04-16 | Gen Electric | Turbine bucket and nozzle. |
US4433955A (en) * | 1981-03-26 | 1984-02-28 | General Electric Company | Turbine arrangement |
GB2164098B (en) * | 1984-09-07 | 1988-12-07 | Rolls Royce | Improvements in or relating to aerofoil section members for turbine engines |
CH674561A5 (en) * | 1987-12-21 | 1990-06-15 | Bbc Brown Boveri & Cie | |
DE4228879A1 (en) * | 1992-08-29 | 1994-03-03 | Asea Brown Boveri | Turbine with axial flow |
CH687269A5 (en) * | 1993-04-08 | 1996-10-31 | Abb Management Ag | Gas turbine group. |
DE4435266A1 (en) * | 1994-10-01 | 1996-04-04 | Abb Management Ag | burner |
US5488825A (en) * | 1994-10-31 | 1996-02-06 | Westinghouse Electric Corporation | Gas turbine vane with enhanced cooling |
EP0916812B1 (en) * | 1997-11-17 | 2003-03-05 | ALSTOM (Switzerland) Ltd | Final stage for an axial turbine |
-
2009
- 2009-03-04 WO PCT/EP2009/052533 patent/WO2009118234A1/en active Application Filing
- 2009-03-04 EP EP09724433A patent/EP2268900A1/en not_active Ceased
-
2010
- 2010-09-28 US US12/892,555 patent/US20110038733A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2899128A (en) * | 1959-08-11 | Vaghi |
Non-Patent Citations (1)
Title |
---|
See also references of WO2009118234A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009118234A1 (en) | 2009-10-01 |
US20110038733A1 (en) | 2011-02-17 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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Effective date: 20100921 |
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AX | Request for extension of the european patent |
Extension state: AL BA RS |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HUBER, MICHAEL Inventor name: HOFMANN, WILLY HEINZ |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20140703 |
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18R | Application refused |
Effective date: 20150418 |