CA1191456A - Structure for a cooled turbine rotor blade - Google Patents
Structure for a cooled turbine rotor bladeInfo
- Publication number
- CA1191456A CA1191456A CA000410243A CA410243A CA1191456A CA 1191456 A CA1191456 A CA 1191456A CA 000410243 A CA000410243 A CA 000410243A CA 410243 A CA410243 A CA 410243A CA 1191456 A CA1191456 A CA 1191456A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- tip
- cavity
- apertures
- outside
- 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
Links
- 238000001816 cooling Methods 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 5
- 235000019628 coolness Nutrition 0.000 claims description 2
- 238000013022 venting Methods 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
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
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
- F01D5/187—Convection cooling
-
- 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
- F05D2250/20—Three-dimensional
- F05D2250/23—Three-dimensional prismatic
- F05D2250/231—Three-dimensional prismatic cylindrical
-
- 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
- F05D2250/20—Three-dimensional
- F05D2250/23—Three-dimensional prismatic
- F05D2250/232—Three-dimensional prismatic conical
-
- 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
- F05D2250/20—Three-dimensional
- F05D2250/24—Three-dimensional ellipsoidal
- F05D2250/241—Three-dimensional ellipsoidal spherical
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention comprises a cooled turbine rotor blade having an improved blade tip structure. A groove is provided in the trailing edge end of the blade tip on those turbine blades whose trailing edge is too thin to support an extension of the blade walls to form a blade tip cavity which extends to the tip of the trailing edge of the blade. The groove protects adjoining exhaust aper-tures from closure by a blade tip smear.
The invention comprises a cooled turbine rotor blade having an improved blade tip structure. A groove is provided in the trailing edge end of the blade tip on those turbine blades whose trailing edge is too thin to support an extension of the blade walls to form a blade tip cavity which extends to the tip of the trailing edge of the blade. The groove protects adjoining exhaust aper-tures from closure by a blade tip smear.
Description
IMPROVED STRUCTURE FOR A COOLED
TURBIN~ ROTOR ]3LADE
BACKGROUND OF THE INV~NTION
~he present invention relates generally to com-bustion turbine rotor blades and more particularly to an improved tip structure for a cooled turbine rotor blade.
It is well established that greater operating efficiency and power oukput of a combustion turbine may be achieved through higher inlet operating temperatures.
Inlet operating temperatures are limited, however, by -the maximum temperature tolerable to the rotating turbine blades. Also, as turbine blade temperature increases with increasing inlet gas temperature, the vulnerability of the blades to damage from the tension and stresses which nor-mally accompany blade rotation increases. Cooling the turbine blades, or forming the turbine blades from a tem-perature resistant material, or both, permits an increase in inlet operating temperatures while keeping turbine blade temperature below the maximum specified opera-ting temperature for the blade material.
In a typical prior art combustion turbine, cool-ing air drawn from a compressor section of the turbine ispassed through channels in the turbine rotor to each of several rotor discs. Passageways within each rotor disc communicate the cooling air from the turbine rotor to a blade root at the base of each turbine blade. Generally, the cooling air flows from the blade root through an air-,~
foil portion of the blade and exits at least partiallythrough the tip of the blade.
A typical prior art blade tip struc-ture defines an outwardly facing cavity formed by a radially outward extension of the blade wall surrounding the ex~erior sur-face of the blade tip. Cooling air exits from apertures in the exterior surface of the blade tip into the cavity.
The tip cavity structure prevents sealing of individual exhaust apertures by a minor contact between the blade tip and the surrounding turbine casing. Such a blockage, or blade tip smear, could result in burning of the turbine blade due to reduced cooling air flow through the blade.
The prior art inclucles two different blade tip cavity structures, the choice of structure depending upon the blade row in which the blade is positioned. Generally, the blade geometry varies with each row of turbine blades.
One geometric variable is the thickness of the turbine blade trailing edge the thickness typically de-creasing by row in the downstream direction. In initial turbine blade rows the trailing edge is thick enough to support an extension of the blade wall so that the blade tip cavity extends over the trailing edge to cover the entire exterior blade tip surface. In this configuration all apertures in the exterior blade tip surface vent cooling air into the cavity. A portion of the blade wall toward the trailing edge of a convex side of the blade is removed to provide a cooling air exit path from the blade tip cavity. This structure is described in greater detail in Swiss Patent No. 225,231 and United States Patent No.
3,635,585.
In dowstream blade rows, where the thickness of the trailing edge becomes too thin to support an extension of the blade wall, the blade tip cavity must terminate a-t some point short of the trailing edge of -the blade. With no cavity to protect the apertures in the blade tip sur-face at the trailing edge, an alternate means must be de-vised to prevent the apertures outside the cavity from being sealed by a blade tip smear.
s~
In typical prior art, a window or notch is structured in the concave side of the trailing edge of the blade so that the cooling air e~its from apertures which are recessed from the radially outermost point on the blade tip surface. The window in the trailing edge effec-tively prevents the exhaust apertures therein from being closed by a blade tip smear, but does so at a cost to the efficiency of the turbine blade. The window removes a portion of the working surface on the concave side of the blade, thereby reducing blade efficiency.
It would be advantageous to design a turbine blade with tip structure at the trailing edge which effec-tively prevents closure of cooling air apertures outside the tip cavity by blade tip smearing but does not detract from turbine blade efficiency by removal of a portion of the blade wall.
SUMMARY OF THE INVENTION
Accordingly, a cooled turbine rotor blade is provided wherein the turbine rotor blade has an improved blade tip structure which protects cooling air exhaust apertures in the trailing edge end of the blade tip from closure as a result of contact between the blade tip and the outer annulus of a turbine casing. Protection of the exhaust apertures from a blade tip smear is accomplished without diminishing the performance efficiency of the tur-bine blade. The improved blade tip structure comprises an axially extending, outwardly facing groove in the trailing edge end of the blade tip. Each aperture in the trailing edge end of the tip adjoins and is in flow communication with the groove. Alternatively, the improved blade tip structure comprises an outwardly facing opening surround-ing and adjoining an aperture in the trailing edge and of the blade tip. The width and depth of the opening are chosen so as to minimize the risk of aperture closure due to a blade tip swear.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows an upper airfoil portion of a typical prior art rotor blade with a blade tip cavity and a trailing edge window.
Figure 2 shows a portion of the tip of a turbine rotor blade structured according to the principles of the invention with a groove along the trailing edge of the tip.
Figure 3 shows a sectional view of the trailing edge of the blade depicted in Figure 2.
Figure 4 shows a portion of a blade tip struc-tured in an alternative embodiment according to the prin-ciples of the invention with flared edges around apertures in the trailing edge of the blade tip.
E'igure 5 shows a sectional view of a trailing edge of the turbine blade depicted in Figure 4.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Figure 1 shows a typical prior art turbine rotor blade. The turbine rotor blade comprises a root portion 13 which interlocks with a turbine disc (not shown) and an airfoil portion 15, having a concave side and a convex side, which intercepts hot gases, converting the rnotive energy of the gases into rotation of the turbine disc.
The blade further comprises a tip portion 10.
The blade tip lO comprises two distinct struc-tures: a blade tip cavity 12 and a trailing edge window 14. The blade tip cavity 12 is an outwardly facing (rela-tive to a turbine rotor axis) cavity formed by the outward extension of the blade wall 16 around the exterior surface 18 of the blade tip. The cavity 12 terminates short of the trailing edge end of the blade tip, where the blade is too thin to support an extension of the blade wall as shown at 16. Cooling air which enters the blade at the base of th~ root portion 13 flows throu~h cooling channels in the root portion and the airfoil portion 15 and exits through apertures 20 into the blade tip çavity. Cooling air in the blade tip cavity l.2 flows past a clearance (not shown) between -the extended blade wall 16 surrounding the cavity and an outer annulus of the turbine casing (not shown) into an exhaust path of gases driving the turbine.
The trailing edge window 14 in the concave side of the turbine blade is a notch like depression permitting the exit of cooling air through one or more apertures 22 positioned in an outwardly facing surface 24 at the base of the window. The window structure ensures against sealing of the trailing edge apertures by minor contact be-tween the trailing edge tip 26 and the outer annulus of the turbine casing (not shown). The window structure 14 performs the protection function ~uite well, but detracts from blade performance by removing a seckion of the blade wall.
In accordance with the principles of the inven-tion, a turbine rotor blade having a trailing edge which is too thin to define a blade tip cavity is structured to prevent sealing of cooling air exhaust apertures by a blade tip smear. The improvement is implemented without reduction of the surface area of the blade wall and re-sultant decrease in blade efficiency.
More particularly, Figure 2 discloses a pre-ferred embodiment 30 of the invention wherein each of several outside apertures 32 in the trailing edge 33 of the blade tip are connected by means of a single outwarAly facing, axially extending groove, or channel 34. Figure 3 shows a cross-sectional view of the trailing edge of the blade tip 30 depicted in Figure 2. As is revealed there in, the groove 34 has a U-shaped or circular cross-section with the groove diameter slightly larger than the diameter of the adjoining cooling air exhaust channel 36.
The embodiment of the invention depicted in Figures 2 and 3 ensures that a minor rub at the trailing edge 33 of the blade tip surface will not seal an outside cooling alr exhaust aperture 32. Should a portion of the blade tip be smeared across an outside aperture 32, the recess defined by the groove provides a flow path from the outside aperture 32 immediately beneath the smear to the exterior of the blade. In this way a continuous flow of cooling air is assured and an accumulation of heat within the airfoil portion of the turbine blade, which heat might destroy the turbine blade, is avoided.
The invention is not to be limited to the U-shaped cross-section of the groove depicted in Figure 3.
It is anticipated that the groove may be formed in any of a variety of cross~sectional shapes, the preferred feature being the provision of a flow path in the event of a blade tip smear. The width and depth of the groove may also vary from that depicted in Fi~lre 3 so as to adjust for the amount of material which might be deposited by a blade tip smear.
A second embodiment 40 of the invention is dis-closed in Figures 4 and 5. The outside apertures 42 in the trailing edge of the tip of the blade are not connect~
ed by any means such as in the prior embodiment of the invention. Rather, each individual aperture 42 is struc-tured to minimize the risk of closure by a blade tip smear. The protection function is accomplished by flaring the opening to a countersink configuration 44 as revealed in Figure 5. The maximum width and depth o~ each opening 44 may be varied as necessary according to the position of the outside aperture on the trailing edge of the tip and according to the degree of potential contact with the turbine casing.
Implementation of the invention will improve performance of the turbine rotor blades by increasing the working surface area on the concave side of the blades.
The improvement and performance efficiency is expected to be on the order of 1%, which is quite significant for a single improvement in turbine blade structure.
TURBIN~ ROTOR ]3LADE
BACKGROUND OF THE INV~NTION
~he present invention relates generally to com-bustion turbine rotor blades and more particularly to an improved tip structure for a cooled turbine rotor blade.
It is well established that greater operating efficiency and power oukput of a combustion turbine may be achieved through higher inlet operating temperatures.
Inlet operating temperatures are limited, however, by -the maximum temperature tolerable to the rotating turbine blades. Also, as turbine blade temperature increases with increasing inlet gas temperature, the vulnerability of the blades to damage from the tension and stresses which nor-mally accompany blade rotation increases. Cooling the turbine blades, or forming the turbine blades from a tem-perature resistant material, or both, permits an increase in inlet operating temperatures while keeping turbine blade temperature below the maximum specified opera-ting temperature for the blade material.
In a typical prior art combustion turbine, cool-ing air drawn from a compressor section of the turbine ispassed through channels in the turbine rotor to each of several rotor discs. Passageways within each rotor disc communicate the cooling air from the turbine rotor to a blade root at the base of each turbine blade. Generally, the cooling air flows from the blade root through an air-,~
foil portion of the blade and exits at least partiallythrough the tip of the blade.
A typical prior art blade tip struc-ture defines an outwardly facing cavity formed by a radially outward extension of the blade wall surrounding the ex~erior sur-face of the blade tip. Cooling air exits from apertures in the exterior surface of the blade tip into the cavity.
The tip cavity structure prevents sealing of individual exhaust apertures by a minor contact between the blade tip and the surrounding turbine casing. Such a blockage, or blade tip smear, could result in burning of the turbine blade due to reduced cooling air flow through the blade.
The prior art inclucles two different blade tip cavity structures, the choice of structure depending upon the blade row in which the blade is positioned. Generally, the blade geometry varies with each row of turbine blades.
One geometric variable is the thickness of the turbine blade trailing edge the thickness typically de-creasing by row in the downstream direction. In initial turbine blade rows the trailing edge is thick enough to support an extension of the blade wall so that the blade tip cavity extends over the trailing edge to cover the entire exterior blade tip surface. In this configuration all apertures in the exterior blade tip surface vent cooling air into the cavity. A portion of the blade wall toward the trailing edge of a convex side of the blade is removed to provide a cooling air exit path from the blade tip cavity. This structure is described in greater detail in Swiss Patent No. 225,231 and United States Patent No.
3,635,585.
In dowstream blade rows, where the thickness of the trailing edge becomes too thin to support an extension of the blade wall, the blade tip cavity must terminate a-t some point short of the trailing edge of -the blade. With no cavity to protect the apertures in the blade tip sur-face at the trailing edge, an alternate means must be de-vised to prevent the apertures outside the cavity from being sealed by a blade tip smear.
s~
In typical prior art, a window or notch is structured in the concave side of the trailing edge of the blade so that the cooling air e~its from apertures which are recessed from the radially outermost point on the blade tip surface. The window in the trailing edge effec-tively prevents the exhaust apertures therein from being closed by a blade tip smear, but does so at a cost to the efficiency of the turbine blade. The window removes a portion of the working surface on the concave side of the blade, thereby reducing blade efficiency.
It would be advantageous to design a turbine blade with tip structure at the trailing edge which effec-tively prevents closure of cooling air apertures outside the tip cavity by blade tip smearing but does not detract from turbine blade efficiency by removal of a portion of the blade wall.
SUMMARY OF THE INVENTION
Accordingly, a cooled turbine rotor blade is provided wherein the turbine rotor blade has an improved blade tip structure which protects cooling air exhaust apertures in the trailing edge end of the blade tip from closure as a result of contact between the blade tip and the outer annulus of a turbine casing. Protection of the exhaust apertures from a blade tip smear is accomplished without diminishing the performance efficiency of the tur-bine blade. The improved blade tip structure comprises an axially extending, outwardly facing groove in the trailing edge end of the blade tip. Each aperture in the trailing edge end of the tip adjoins and is in flow communication with the groove. Alternatively, the improved blade tip structure comprises an outwardly facing opening surround-ing and adjoining an aperture in the trailing edge and of the blade tip. The width and depth of the opening are chosen so as to minimize the risk of aperture closure due to a blade tip swear.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows an upper airfoil portion of a typical prior art rotor blade with a blade tip cavity and a trailing edge window.
Figure 2 shows a portion of the tip of a turbine rotor blade structured according to the principles of the invention with a groove along the trailing edge of the tip.
Figure 3 shows a sectional view of the trailing edge of the blade depicted in Figure 2.
Figure 4 shows a portion of a blade tip struc-tured in an alternative embodiment according to the prin-ciples of the invention with flared edges around apertures in the trailing edge of the blade tip.
E'igure 5 shows a sectional view of a trailing edge of the turbine blade depicted in Figure 4.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Figure 1 shows a typical prior art turbine rotor blade. The turbine rotor blade comprises a root portion 13 which interlocks with a turbine disc (not shown) and an airfoil portion 15, having a concave side and a convex side, which intercepts hot gases, converting the rnotive energy of the gases into rotation of the turbine disc.
The blade further comprises a tip portion 10.
The blade tip lO comprises two distinct struc-tures: a blade tip cavity 12 and a trailing edge window 14. The blade tip cavity 12 is an outwardly facing (rela-tive to a turbine rotor axis) cavity formed by the outward extension of the blade wall 16 around the exterior surface 18 of the blade tip. The cavity 12 terminates short of the trailing edge end of the blade tip, where the blade is too thin to support an extension of the blade wall as shown at 16. Cooling air which enters the blade at the base of th~ root portion 13 flows throu~h cooling channels in the root portion and the airfoil portion 15 and exits through apertures 20 into the blade tip çavity. Cooling air in the blade tip cavity l.2 flows past a clearance (not shown) between -the extended blade wall 16 surrounding the cavity and an outer annulus of the turbine casing (not shown) into an exhaust path of gases driving the turbine.
The trailing edge window 14 in the concave side of the turbine blade is a notch like depression permitting the exit of cooling air through one or more apertures 22 positioned in an outwardly facing surface 24 at the base of the window. The window structure ensures against sealing of the trailing edge apertures by minor contact be-tween the trailing edge tip 26 and the outer annulus of the turbine casing (not shown). The window structure 14 performs the protection function ~uite well, but detracts from blade performance by removing a seckion of the blade wall.
In accordance with the principles of the inven-tion, a turbine rotor blade having a trailing edge which is too thin to define a blade tip cavity is structured to prevent sealing of cooling air exhaust apertures by a blade tip smear. The improvement is implemented without reduction of the surface area of the blade wall and re-sultant decrease in blade efficiency.
More particularly, Figure 2 discloses a pre-ferred embodiment 30 of the invention wherein each of several outside apertures 32 in the trailing edge 33 of the blade tip are connected by means of a single outwarAly facing, axially extending groove, or channel 34. Figure 3 shows a cross-sectional view of the trailing edge of the blade tip 30 depicted in Figure 2. As is revealed there in, the groove 34 has a U-shaped or circular cross-section with the groove diameter slightly larger than the diameter of the adjoining cooling air exhaust channel 36.
The embodiment of the invention depicted in Figures 2 and 3 ensures that a minor rub at the trailing edge 33 of the blade tip surface will not seal an outside cooling alr exhaust aperture 32. Should a portion of the blade tip be smeared across an outside aperture 32, the recess defined by the groove provides a flow path from the outside aperture 32 immediately beneath the smear to the exterior of the blade. In this way a continuous flow of cooling air is assured and an accumulation of heat within the airfoil portion of the turbine blade, which heat might destroy the turbine blade, is avoided.
The invention is not to be limited to the U-shaped cross-section of the groove depicted in Figure 3.
It is anticipated that the groove may be formed in any of a variety of cross~sectional shapes, the preferred feature being the provision of a flow path in the event of a blade tip smear. The width and depth of the groove may also vary from that depicted in Fi~lre 3 so as to adjust for the amount of material which might be deposited by a blade tip smear.
A second embodiment 40 of the invention is dis-closed in Figures 4 and 5. The outside apertures 42 in the trailing edge of the tip of the blade are not connect~
ed by any means such as in the prior embodiment of the invention. Rather, each individual aperture 42 is struc-tured to minimize the risk of closure by a blade tip smear. The protection function is accomplished by flaring the opening to a countersink configuration 44 as revealed in Figure 5. The maximum width and depth o~ each opening 44 may be varied as necessary according to the position of the outside aperture on the trailing edge of the tip and according to the degree of potential contact with the turbine casing.
Implementation of the invention will improve performance of the turbine rotor blades by increasing the working surface area on the concave side of the blades.
The improvement and performance efficiency is expected to be on the order of 1%, which is quite significant for a single improvement in turbine blade structure.
Claims (5)
1. A turbine rotor blade having a root portion for securing the blade in a rotor disc, an airfoil portion contoured to define concave and convex sides for intercepting the flow of hot motive gases, air channels within the root and airfoil por-tions for supporting the flow of cooling air therethrough, and a tip portion structured to provide an exhaust path for cooling air from the airfoil portion, said tip portion comprising:
an outwardly facing tip cavity defined substantially by a wall extending radially outward from said airfoil portion and having a predetermined and structurally adequate thickness;
a trailing edge end of said tip portion being formed by a radially extended airfoil portion contiguous with said cavity defining wall and extending to the trailing blade edge thereby enabling the blade trailing edge to be relatively thin;
apertures in the exterior surface of said tip portion within said cavity for venting cooling air from the airfoil cool-ing channels into said cavity;
at least one aperture in the exterior surface of said edge end of said tip portion outside from said cavity for venting blade cooling channel air; and means for recessing said outside aperture from the exterior surface of said tip end portion to a depth less than the depth of said cavity so as to maintain the structural integrity of the tip end portion, and so that clogging of said outside aperture by a blade tip smear is avoided.
an outwardly facing tip cavity defined substantially by a wall extending radially outward from said airfoil portion and having a predetermined and structurally adequate thickness;
a trailing edge end of said tip portion being formed by a radially extended airfoil portion contiguous with said cavity defining wall and extending to the trailing blade edge thereby enabling the blade trailing edge to be relatively thin;
apertures in the exterior surface of said tip portion within said cavity for venting cooling air from the airfoil cool-ing channels into said cavity;
at least one aperture in the exterior surface of said edge end of said tip portion outside from said cavity for venting blade cooling channel air; and means for recessing said outside aperture from the exterior surface of said tip end portion to a depth less than the depth of said cavity so as to maintain the structural integrity of the tip end portion, and so that clogging of said outside aperture by a blade tip smear is avoided.
2. A turbine rotor blade according to claim 1 wherein a plurality of outside apertures are provided and said recessing means comprises an outwardtly facing, axially extending groove in the exterior surface of said tip end portion, adjoining and in flow communication with each of said outside apertures.
3. A turbine rotor blade according to claim 2 wherein said groove has a U-shaped cross-section with a width which exceeds the diameter of said outside apertures.
4. A turbine rotor blade according to claim 1 wherein a plurality of outside apertures are provided and said recessing means comprises an individual, outwardly facing opening surrounding, adjoining and in flow communication with each of said outside apertures.
5. A turbine rotor blade according to claim 4, wherein each of said openings has walls tapered in a countersink configuration so that the diameter of each of said openings at the exterior surface of said tip portion exceeds the diameter of said outside apertures.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29881981A | 1981-09-02 | 1981-09-02 | |
| US298,819 | 1994-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1191456A true CA1191456A (en) | 1985-08-06 |
Family
ID=23152126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000410243A Expired CA1191456A (en) | 1981-09-02 | 1982-08-26 | Structure for a cooled turbine rotor blade |
Country Status (8)
| Country | Link |
|---|---|
| JP (2) | JPS5844201A (en) |
| AR (1) | AR228676A1 (en) |
| BE (1) | BE894260A (en) |
| BR (1) | BR8205083A (en) |
| CA (1) | CA1191456A (en) |
| GB (1) | GB2105415B (en) |
| IT (1) | IT1153721B (en) |
| MX (1) | MX155481A (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2155558A (en) * | 1984-03-10 | 1985-09-25 | Rolls Royce | Turbomachinery rotor blades |
| US4589823A (en) * | 1984-04-27 | 1986-05-20 | General Electric Company | Rotor blade tip |
| US4682933A (en) * | 1984-10-17 | 1987-07-28 | Rockwell International Corporation | Labyrinthine turbine-rotor-blade tip seal |
| US4761116A (en) * | 1987-05-11 | 1988-08-02 | General Electric Company | Turbine blade with tip vent |
| US4893987A (en) * | 1987-12-08 | 1990-01-16 | General Electric Company | Diffusion-cooled blade tip cap |
| US5667359A (en) * | 1988-08-24 | 1997-09-16 | United Technologies Corp. | Clearance control for the turbine of a gas turbine engine |
| JPH04260047A (en) * | 1991-02-15 | 1992-09-16 | Konica Corp | Production of seamnless belt photosensitive material |
| JPH04109401U (en) * | 1991-03-12 | 1992-09-22 | アドバンス・コージエネレーシヨンシステム技術研究組合 | air cooled rotor blades |
| US5476364A (en) * | 1992-10-27 | 1995-12-19 | United Technologies Corporation | Tip seal and anti-contamination for turbine blades |
| US6652235B1 (en) * | 2002-05-31 | 2003-11-25 | General Electric Company | Method and apparatus for reducing turbine blade tip region temperatures |
| US7270514B2 (en) * | 2004-10-21 | 2007-09-18 | General Electric Company | Turbine blade tip squealer and rebuild method |
| US8157504B2 (en) * | 2009-04-17 | 2012-04-17 | General Electric Company | Rotor blades for turbine engines |
| GB201112803D0 (en) | 2011-07-26 | 2011-09-07 | Rolls Royce Plc | Master component for flow calibration |
| JP6159151B2 (en) * | 2013-05-24 | 2017-07-05 | 三菱日立パワーシステムズ株式会社 | Turbine blade |
| US10041358B2 (en) | 2014-05-08 | 2018-08-07 | United Technologies Corporation | Gas turbine engine blade squealer pockets |
| US20160258302A1 (en) * | 2015-03-05 | 2016-09-08 | General Electric Company | Airfoil and method for managing pressure at tip of airfoil |
| US10107108B2 (en) | 2015-04-29 | 2018-10-23 | General Electric Company | Rotor blade having a flared tip |
-
1982
- 1982-08-13 MX MX194003A patent/MX155481A/en unknown
- 1982-08-26 CA CA000410243A patent/CA1191456A/en not_active Expired
- 1982-08-30 IT IT23026/82A patent/IT1153721B/en active
- 1982-08-30 AR AR290476A patent/AR228676A1/en active
- 1982-08-30 BR BR8205083A patent/BR8205083A/en unknown
- 1982-08-30 JP JP57149370A patent/JPS5844201A/en active Pending
- 1982-08-31 BE BE0/208922A patent/BE894260A/en not_active IP Right Cessation
- 1982-09-01 GB GB08224899A patent/GB2105415B/en not_active Expired
-
1985
- 1985-12-10 JP JP1985189183U patent/JPS6349521Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| MX155481A (en) | 1988-03-17 |
| GB2105415A (en) | 1983-03-23 |
| AR228676A1 (en) | 1983-03-30 |
| BR8205083A (en) | 1983-08-09 |
| IT1153721B (en) | 1987-01-14 |
| JPS5844201A (en) | 1983-03-15 |
| JPS6349521Y2 (en) | 1988-12-20 |
| JPS61113902U (en) | 1986-07-18 |
| BE894260A (en) | 1983-02-28 |
| GB2105415B (en) | 1985-08-07 |
| IT8223026A0 (en) | 1982-08-30 |
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