US20040013515A1 - Turbine blade having angled squealer tip - Google Patents
Turbine blade having angled squealer tip Download PDFInfo
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- US20040013515A1 US20040013515A1 US10/196,623 US19662302A US2004013515A1 US 20040013515 A1 US20040013515 A1 US 20040013515A1 US 19662302 A US19662302 A US 19662302A US 2004013515 A1 US2004013515 A1 US 2004013515A1
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- tip
- turbine blade
- rib
- tip rib
- angle
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- 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
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- 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
- F01D5/145—Means for influencing boundary layers or secondary circulations
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- 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
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- 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
- F05D2250/29—Three-dimensional machined; miscellaneous
- F05D2250/292—Three-dimensional machined; miscellaneous tapered
Definitions
- the present invention relates generally to turbine blades for a gas turbine engine and, in particular, to the cooling of the tip and the tip leakage flow of such turbine blades.
- the airfoil has a generally concave pressure side and generally convex suction side extending axially between corresponding leading and trailing edges and radially between a root and a tip. It will be understood that the blade tip is spaced closely to a radially outer turbine shroud for minimizing leakage therebetween of the combustion gases flowing downstream between the turbine blades. Maximum efficiency of the engine is obtained by minimizing the tip clearance or gap, but is limited by the differential thermal and mechanical expansion and contraction between the rotor blades and the turbine shroud for reducing the likelihood of undesirable tip rubs.
- the turbine blades are bathed in hot combustion gases, effective cooling is required for ensuring a useful life.
- the blade airfoils are hollow and disposed in flow communication with the compressor so that a portion of pressurized air bled therefrom is received for use in cooling the airfoils.
- Airfoil cooling is quite sophisticated and may be effected using various forms of internal cooling channels and features, as well as cooling holes through the walls of the airfoil for discharging the cooling air.
- the airfoil tip is particularly difficult to cool since it is located directly adjacent to the turbine shroud and the hot combustion gases which flow through the tip gap therebetween. Accordingly, a portion of the air channeled inside the airfoil is typically discharged through the tip for cooling thereof.
- the tip typically includes a continuous radially outwardly projecting edge rib disposed coextensively along the pressure and suction sides between the leading and trailing edges, where the tip rib follows the aerodynamic contour around the airfoil and is a significant contributor to the aerodynamic efficiency thereof.
- the tip rib has portions spaced apart on the opposite pressure and suction sides to define an open top tip cavity.
- a tip plate or floor extends between the pressure and suction side ribs and encloses the top of the airfoil for containing the cooling air therein.
- Tip holes are also provided which extend through the floor for cooling the tip and filling the tip cavity.
- a turbine blade for a gas turbine engine is disclosed as including an airfoil and integral dovetail for mounting the airfoil along a radial axis to a rotor disk inboard of a turbine shroud.
- the airfoil further includes: first and second sidewalls joined together at a leading edge and a trailing edge, where the first and second sidewalls extend from a root disposed adjacent the dovetail to a tip plate for channeling combustion gases thereover; and, at least one tip rib extending outwardly from the tip plate between the leading and trailing edges.
- the tip rib is oriented so that an axis extending longitudinally therethrough is at an angle with respect to the radial axis for at least a designated portion of an axial length of the turbine blade.
- the angle between the longitudinal axis and the radial axis may be substantially the same across the designated portion or may vary thereacross.
- a turbine blade for a gas turbine engine is disclosed as including an airfoil and integral dovetail for mounting the airfoil along a radial axis to a rotor disk inboard of a turbine shroud.
- the airfoil further includes: first and second sidewalls joined together at a leading edge and a trailing edge, where the first and second sidewalls extend from a root disposed adjacent the dovetail to a tip plate for channeling combustion gases thereover; and, at least one tip rib extending outwardly from the tip plate between the leading and trailing edges.
- the tip rib is oriented with respect to the radial axis so that a first recirculation zone of the combustion gases is formed adjacent a distal end of the tip rib which reduces a leakage flow of the combustion gases between the airfoil and the shroud for at least a designated portion of an axial length of the turbine blade.
- FIG. 1 is a partly sectional, isometric view of an exemplary gas turbine engine rotor blade mounted in a rotor disk within a surrounding shroud, with the blade having a tip in accordance with an exemplary embodiment of the present invention
- FIG. 2 is an isometric view of the blade tip as illustrated in FIG. 1 having a pair of aerodynamic tip ribs in accordance with an exemplary embodiment
- FIG. 3 is a top view of the blade tip illustrated in FIGS. 1 and 2;
- FIG. 4 is an elevational, sectional view through the blade tip illustrated in FIG. 3 within the turbine shroud, taken generally along line 4 - 4 , and depicting a maximum angle between a longitudinal axis through the blade tip ribs and the radial axis;
- FIG. 5 is an elevational, sectional view through the blade tip illustrated in FIG. 3 within the turbine shroud, taken generally along line 5 - 5 , and depicting a minimum angle between a longitudinal axis through the blade tip ribs and the radial axis;
- FIG. 6 is an elevational, sectional view through an alternative blade tip like that illustrated in FIGS. 4 and 5, where a longitudinal axis through the blade tip rib at the pressure side of the airfoil forms an acute angle with respect to the radial axis and the blade tip rib at the suction side of the airfoil is substantially parallel to the radial axis;
- FIG. 7 is an elevational, sectional view through a second alternative blade tip like that illustrated in FIGS. 4 and 5, where a longitudinal axis through the blade tip rib at the suction side of the airfoil forms an acute angle with respect to the radial axis in the upstream direction and the blade tip rib at the pressure side of the airfoil is substantially parallel to the radial axis;
- FIG. 8 is an elevational, sectional view through a third alternative blade tip like that illustrated in FIGS. 4 and 5, where a longitudinal axis through the blade tip rib at the suction side of the airfoil forms an acute angle with respect to the radial axis in the downstream direction and the blade tip rib at the pressure side of the airfoil is substantially parallel to the radial axis;
- FIG. 9 is an elevational, sectional view through a fourth alternative blade tip like that illustrated in FIGS. 4 and 5, where a third intermediate blade tip rib is positioned between the blade tip ribs located adjacent the pressure and suction sides of the airfoil;
- FIG. 10A is an enlarged, partial sectional view through the blade tip illustrated in FIG. 4 within the turbine shroud depicting the flow of combustion gases adjacent the pressure side blade tip rib and through the gap between such rib and the turbine shroud;
- FIG. 10B is an enlarged, partial sectional view through the blade tip illustrated in FIG. 4 within the turbine shroud depicting the flow of combustion gases adjacent the suction side blade tip rib, the area between the pressure and suction side blade tip ribs, and through the gap between such ribs and the turbine shroud.
- FIG. 1 depicts a portion of a high pressure turbine 10 of a gas turbine engine which is mounted directly downstream from a combustor (not shown) for receiving hot combustion gases 12 therefrom.
- Turbine 10 which is axisymmetrical about an axial centerline axis 14 , includes a rotor disk 16 and a plurality of circumferentially spaced apart turbine rotor blades 18 (one of which being shown) extending radially outwardly from rotor disk 16 along a radial axis 17 .
- An annular turbine shroud 20 is suitably joined to a stationary stator casing (not shown) and surrounds blades 18 for providing a relatively small clearance or gap therebetween for limiting leakage of combustion gases 12 therethrough during operation.
- Each blade 18 preferably includes a dovetail 22 which may have any conventional form, such as an axial dovetail configured for being mounted in a corresponding dovetail slot in the perimeter of the rotor disk 16 .
- a hollow airfoil 24 is integrally joined to dovetail 22 and extends radially or longitudinally outwardly therefrom.
- Blade 18 also includes an integral platform 26 disposed at the junction of airfoil 24 and dovetail 22 for defining a portion of the radially inner flowpath for combustion gases 12 . It will be appreciated that blade 18 may be formed in any conventional manner, and is typically a one-piece casting.
- airfoil 24 preferably includes a generally concave first or pressure sidewall 28 and a circumferentially or laterally opposite, generally convex, second or suction sidewall 30 extending axially or chordally between opposite leading and trailing edges 32 and 34 , respectively.
- Sidewalls 28 and 30 also extend in the radial or longitudinal direction between a radially inner root 36 at platform 26 and a radially outer tip 38 .
- first and second sidewalls 28 and 30 are spaced apart in the lateral or circumferential direction over the entire longitudinal or radial span of airfoil 24 to define at least one internal flow chamber or channel 40 for channeling cooling air 42 through airfoil 24 for cooling thereof. Cooling air 42 is typically bled from the compressor (not shown) in any conventional manner.
- airfoil 24 may have any configuration including, for example, serpentine flow channels with various turbulators therein for enhancing cooling air effectiveness, with cooling air 42 being discharged through various holes through airfoil 24 such as conventional film cooling holes 44 and trailing edge discharge holes 46 .
- blade tip 38 preferably includes a tip floor or plate 48 disposed integrally atop the radially outer ends of first and second sidewalls 28 and 30 , where tip plate 48 bounds internal cooling channel 40 .
- a first tip wall or rib 50 preferably extends radially outwardly from tip plate 48 between leading and trailing edges 32 and 34 adjacent first (pressure) sidewall 28 .
- a second tip wall or rib 52 also preferably extends radially outwardly from tip plate 48 between leading and trailing edges 32 and 34 , and is spaced laterally from first tip rib 50 adjacent second (suction) sidewall 30 to define an open-top tip channel 54 therebetween.
- tip channel 54 is shown as being enclosed by first and second tip ribs 50 and 52 , it is consistent with the present invention for tip channel 54 to include a tip inlet and tip outlet as disclosed in U.S. Pat. No. 6,059,530 to Lee to assist in discharging combustion gases 12 through tip channel 54 .
- first tip rib 50 is preferably recessed from first sidewall 28 to form a tip shelf 56 substantially parallel to tip plate 48 as has been disclosed in the art to improve cooling of tip 38 .
- the present invention preferably provides that a longitudinal axis 58 extending through first tip rib 50 (see FIG. 4) be formed at an angle ⁇ to radial axis 17 for at least a designated portion 60 of an axial length of turbine blade 18 .
- angle ⁇ may be substantially the same or fixed across designated portion 60 , it is preferred that angle ⁇ vary across designated portion 60 as demonstrated by the change in angle ⁇ shown in FIGS. 4 and 5.
- angle ⁇ is preferably at a minimum (approximately 0°) at or adjacent both leading and trailing edges 32 and 34 , respectively.
- angle ⁇ preferably increases gradually to a maximum angle located at a midpoint 62 on first tip rib 50 as depicted in FIG. 4.
- Midpoint 62 is preferably located within designated portion 60 of first tip rib 50 , which is identified as approximately between one-fourth to three-fourths the distance from leading edge 32 to trailing edge 34 .
- angle ⁇ Due to the varying nature of angle ⁇ , it preferably is within a range of approximately 0°-70°, more preferably within a range of approximately 20°-65°, and optimally within a range of approximately 40°-60° as it changes within designated portion 60 .
- designated portion 60 is an axial length of airfoil 24 which preferably extends for approximately 5-95% of a chord through airfoil 24 .
- Designated portion 60 more preferably extends for approximately 7-80% of a chord through airfoil 24 and optimally extends for approximately 10-70% of a chord through airfoil 24 .
- first recirculation zone 64 of combustion gases 12 is formed adjacent a distal end 66 of first tip rib 50 .
- First recirculation zone 64 then functions to reduce the leakage flow of combustion gases (identified by flow arrows 68 ) and, in effect, shrink the size of a gap 70 between blade tip 38 and shroud 20 without risking a rub.
- flow arrows 68 the leakage flow of combustion gases
- recirculation zone 64 increases in size as angle ⁇ is increased.
- first tip rib 50 the depth of tip shelf 56 , and angle ⁇ between longitudinal axis 58 and radial axis 17 .
- a tangent of angle ⁇ is substantially equivalent to the depth of tip shelf 56 divided by the height of first tip rib 50 .
- Inherent limitations on tip shelf depth therefore translate into restrictions on angle ⁇ .
- modifications in the height of first tip rib 50 may be made since recirculation zone 64 serves to shrink the size of gap 70 as noted hereinabove. This means that angle ⁇ may increase by lessening the height of first rib tip 50 for a given tip shelf depth, which also has the advantage of lessening the risk of a rub between first rib tip 50 and shroud 20 .
- a pocket 72 is formed between a surface 74 of first tip rib 50 and tip shelf 56 which promotes a second recirculation zone 76 of combustion gases 12 to be formed therein. Since a plurality of cooling holes 78 are preferably provided within tip shelf 56 to provide a cooling film 80 along first tip rib surface 74 , pocket 72 and second recirculation zone 76 assist in maintaining cooling film 80 near first tip rib 50 (see FIG. 10A). Accordingly, the flow of combustion gases 12 is deflected by first tip rib 50 and cooling film 80 and pushed away from gap 70 . This flow deflection therefore results in increased flow resistance for the leakage flow through gap 70 and maintains cooling film 80 to better cool first tip rib 50 .
- first tip rib 50 may be altered so as to be tapered longitudinally from a first end located adjacent tip plate 48 to distal end 66 , as disclosed in U.S. Pat. No. 6,190,129 to Mayer et al., so as to increase the cooling conduction thereof.
- Distal end 66 of first tip rib 50 may also be tapered in accordance with the teachings of U.S. Pat. No. 6,086,328 to Lee in order to reduce the thermal stress at such location so long as first recirculation zone 64 is preserved.
- first tip rib 50 may be inclined with respect to radial axis 17 and a longitudinal axis 82 of second tip rib 52 may remain substantially parallel to radial axis 17 . It is preferred, however, that second tip rib 52 be oriented so as to be substantially parallel to first tip rib 50 as it extends from leading edge 32 to trailing edge 34 at least within designated region 60 (see FIGS. 4 and 5) so that an angle J exists between longitudinal axis 82 and radial axis 17 .
- a third recirculation zone 84 is preferably formed at a distal end 86 of second tip rib 52 similar to first recirculation zone 64 described with respect to first tip rib 50 (see FIG.
- Third recirculation zone 84 then assists in increasing the flow resistance through gap 70 like first recirculation zone 64 .
- a fourth recirculation zone 85 is generally formed within an area 87 located between first tip rib 50 and second tip rib 52 . Since recirculation of hot combustion gases 12 exists in area 87 , one or more cooling holes 89 are preferably formed through tip plate 48 .
- second tip rib 52 may be angled with respect to radial axis 17 while first tip rib 50 remains substantially parallel to radial axis 17 .
- This angle ⁇ may be at an acute angle in the upstream direction (herein referred to as the positive direction) as shown in FIG. 7 or at an acute angle with respect to radial axis 17 in the downstream direction (herein referred to as the negative direction) as shown in FIG. 8. It will be understood that angle ⁇ will preferably have a range of approximately +60° to approximately ⁇ 60°. It will also be noted from FIG. 8 that second rib tip 52 may be recessed with respect to suction sidewall 30 to form a tip shelf 88 when inclined in the negative (downstream) direction.
- third tip rib 90 located between first and second tip ribs 50 and 52 , respectively, similar to that described in U.S. Pat. No. 6,224,336 (see FIG. 9).
- third tip rib 90 is oriented so that a longitudinal axis 92 therethrough is substantially parallel to radial axis 17 .
- turbine blade and tip thereof can be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the invention.
- certain turbine blades in the art which twist from their leading edge to their trailing edge and/or from their root to the tip may also utilize the rib tip configurations presented herein with appropriate modification so as to create the desired recirculation zones for decreasing tip leakage flow.
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Abstract
Description
- The present invention relates generally to turbine blades for a gas turbine engine and, in particular, to the cooling of the tip and the tip leakage flow of such turbine blades.
- It is well known that air is pressurized in a compressor of a gas turbine engine and mixed with fuel in a combustor to generate hot combustion gases, whereupon such gases flow downstream through one or more turbines so that energy can be extracted therefrom. In accordance with such turbine, a row of circumferentially spaced apart rotor blades extend radially outwardly from a supporting rotor disk. Each blade typically includes a dovetail which permits assembly and disassembly of the blade in a corresponding dovetail slot in the rotor disk, as well as an airfoil which extends radially outwardly from the dovetail.
- The airfoil has a generally concave pressure side and generally convex suction side extending axially between corresponding leading and trailing edges and radially between a root and a tip. It will be understood that the blade tip is spaced closely to a radially outer turbine shroud for minimizing leakage therebetween of the combustion gases flowing downstream between the turbine blades. Maximum efficiency of the engine is obtained by minimizing the tip clearance or gap, but is limited by the differential thermal and mechanical expansion and contraction between the rotor blades and the turbine shroud for reducing the likelihood of undesirable tip rubs.
- Since the turbine blades are bathed in hot combustion gases, effective cooling is required for ensuring a useful life. The blade airfoils are hollow and disposed in flow communication with the compressor so that a portion of pressurized air bled therefrom is received for use in cooling the airfoils. Airfoil cooling is quite sophisticated and may be effected using various forms of internal cooling channels and features, as well as cooling holes through the walls of the airfoil for discharging the cooling air.
- The airfoil tip is particularly difficult to cool since it is located directly adjacent to the turbine shroud and the hot combustion gases which flow through the tip gap therebetween. Accordingly, a portion of the air channeled inside the airfoil is typically discharged through the tip for cooling thereof. The tip typically includes a continuous radially outwardly projecting edge rib disposed coextensively along the pressure and suction sides between the leading and trailing edges, where the tip rib follows the aerodynamic contour around the airfoil and is a significant contributor to the aerodynamic efficiency thereof.
- Generally, the tip rib has portions spaced apart on the opposite pressure and suction sides to define an open top tip cavity. A tip plate or floor extends between the pressure and suction side ribs and encloses the top of the airfoil for containing the cooling air therein. Tip holes are also provided which extend through the floor for cooling the tip and filling the tip cavity.
- It will be appreciated that several exemplary patents related to the cooling of turbine blade tips are disclosed in the art, including: U.S. Pat. No. 5,261,789 to Butts et al.; U.S. Pat. No. 6,179,556 to Bunker; U.S. Pat. No. 6,190,129 to Mayer et al.; and, U.S. Pat. No. 6,059,530 to Lee. These patents disclose various blade tip configurations which include an offset on the pressure and/or suction sides in order to increase flow resistance through the tip gap. Nevertheless, improvement in the pressure distribution near the tip region is still sought to further reduce the overall tip leakage flow and thereby increase turbine efficiency.
- Thus, in light of the foregoing, it would be desirable for a turbine blade tip to be developed which alters the pressure distribution near the tip region to reduce the overall tip leakage flow and thereby increase the efficiency of the turbine. It is also desirable for such turbine blade tip to develop one or more recirculation zones adjacent the ribs at such tip in order to improve the flow characteristics and pressure distribution at the tip region.
- In a first exemplary embodiment of the invention, a turbine blade for a gas turbine engine is disclosed as including an airfoil and integral dovetail for mounting the airfoil along a radial axis to a rotor disk inboard of a turbine shroud. The airfoil further includes: first and second sidewalls joined together at a leading edge and a trailing edge, where the first and second sidewalls extend from a root disposed adjacent the dovetail to a tip plate for channeling combustion gases thereover; and, at least one tip rib extending outwardly from the tip plate between the leading and trailing edges. The tip rib is oriented so that an axis extending longitudinally therethrough is at an angle with respect to the radial axis for at least a designated portion of an axial length of the turbine blade. The angle between the longitudinal axis and the radial axis may be substantially the same across the designated portion or may vary thereacross.
- In a second exemplary embodiment of the invention, a turbine blade for a gas turbine engine is disclosed as including an airfoil and integral dovetail for mounting the airfoil along a radial axis to a rotor disk inboard of a turbine shroud. The airfoil further includes: first and second sidewalls joined together at a leading edge and a trailing edge, where the first and second sidewalls extend from a root disposed adjacent the dovetail to a tip plate for channeling combustion gases thereover; and, at least one tip rib extending outwardly from the tip plate between the leading and trailing edges. The tip rib is oriented with respect to the radial axis so that a first recirculation zone of the combustion gases is formed adjacent a distal end of the tip rib which reduces a leakage flow of the combustion gases between the airfoil and the shroud for at least a designated portion of an axial length of the turbine blade.
- FIG. 1 is a partly sectional, isometric view of an exemplary gas turbine engine rotor blade mounted in a rotor disk within a surrounding shroud, with the blade having a tip in accordance with an exemplary embodiment of the present invention;
- FIG. 2 is an isometric view of the blade tip as illustrated in FIG. 1 having a pair of aerodynamic tip ribs in accordance with an exemplary embodiment;
- FIG. 3 is a top view of the blade tip illustrated in FIGS. 1 and 2;
- FIG. 4 is an elevational, sectional view through the blade tip illustrated in FIG. 3 within the turbine shroud, taken generally along line4-4, and depicting a maximum angle between a longitudinal axis through the blade tip ribs and the radial axis;
- FIG. 5 is an elevational, sectional view through the blade tip illustrated in FIG. 3 within the turbine shroud, taken generally along line5-5, and depicting a minimum angle between a longitudinal axis through the blade tip ribs and the radial axis;
- FIG. 6 is an elevational, sectional view through an alternative blade tip like that illustrated in FIGS. 4 and 5, where a longitudinal axis through the blade tip rib at the pressure side of the airfoil forms an acute angle with respect to the radial axis and the blade tip rib at the suction side of the airfoil is substantially parallel to the radial axis;
- FIG. 7 is an elevational, sectional view through a second alternative blade tip like that illustrated in FIGS. 4 and 5, where a longitudinal axis through the blade tip rib at the suction side of the airfoil forms an acute angle with respect to the radial axis in the upstream direction and the blade tip rib at the pressure side of the airfoil is substantially parallel to the radial axis;
- FIG. 8 is an elevational, sectional view through a third alternative blade tip like that illustrated in FIGS. 4 and 5, where a longitudinal axis through the blade tip rib at the suction side of the airfoil forms an acute angle with respect to the radial axis in the downstream direction and the blade tip rib at the pressure side of the airfoil is substantially parallel to the radial axis;
- FIG. 9 is an elevational, sectional view through a fourth alternative blade tip like that illustrated in FIGS. 4 and 5, where a third intermediate blade tip rib is positioned between the blade tip ribs located adjacent the pressure and suction sides of the airfoil;
- FIG. 10A is an enlarged, partial sectional view through the blade tip illustrated in FIG. 4 within the turbine shroud depicting the flow of combustion gases adjacent the pressure side blade tip rib and through the gap between such rib and the turbine shroud; and,
- FIG. 10B is an enlarged, partial sectional view through the blade tip illustrated in FIG. 4 within the turbine shroud depicting the flow of combustion gases adjacent the suction side blade tip rib, the area between the pressure and suction side blade tip ribs, and through the gap between such ribs and the turbine shroud.
- Referring now to the drawings in detail, wherein identical numerals indicate the same elements throughout the figures, FIG. 1 depicts a portion of a
high pressure turbine 10 of a gas turbine engine which is mounted directly downstream from a combustor (not shown) for receivinghot combustion gases 12 therefrom.Turbine 10, which is axisymmetrical about anaxial centerline axis 14, includes arotor disk 16 and a plurality of circumferentially spaced apart turbine rotor blades 18 (one of which being shown) extending radially outwardly fromrotor disk 16 along aradial axis 17. Anannular turbine shroud 20 is suitably joined to a stationary stator casing (not shown) and surroundsblades 18 for providing a relatively small clearance or gap therebetween for limiting leakage ofcombustion gases 12 therethrough during operation. - Each
blade 18 preferably includes adovetail 22 which may have any conventional form, such as an axial dovetail configured for being mounted in a corresponding dovetail slot in the perimeter of therotor disk 16. Ahollow airfoil 24 is integrally joined to dovetail 22 and extends radially or longitudinally outwardly therefrom. Blade 18 also includes anintegral platform 26 disposed at the junction ofairfoil 24 anddovetail 22 for defining a portion of the radially inner flowpath forcombustion gases 12. It will be appreciated thatblade 18 may be formed in any conventional manner, and is typically a one-piece casting. - It will be seen that
airfoil 24 preferably includes a generally concave first orpressure sidewall 28 and a circumferentially or laterally opposite, generally convex, second orsuction sidewall 30 extending axially or chordally between opposite leading andtrailing edges Sidewalls inner root 36 atplatform 26 and a radiallyouter tip 38. Further, first andsecond sidewalls airfoil 24 to define at least one internal flow chamber orchannel 40 for channelingcooling air 42 throughairfoil 24 for cooling thereof.Cooling air 42 is typically bled from the compressor (not shown) in any conventional manner. - The inside of
airfoil 24 may have any configuration including, for example, serpentine flow channels with various turbulators therein for enhancing cooling air effectiveness, with coolingair 42 being discharged through various holes throughairfoil 24 such as conventionalfilm cooling holes 44 and trailingedge discharge holes 46. - As seen in FIGS.2-5,
blade tip 38 preferably includes a tip floor orplate 48 disposed integrally atop the radially outer ends of first andsecond sidewalls tip plate 48 boundsinternal cooling channel 40. A first tip wall orrib 50 preferably extends radially outwardly fromtip plate 48 between leading andtrailing edges sidewall 28. A second tip wall orrib 52 also preferably extends radially outwardly fromtip plate 48 between leading andtrailing edges first tip rib 50 adjacent second (suction)sidewall 30 to define an open-top tip channel 54 therebetween. Althoughtip channel 54 is shown as being enclosed by first andsecond tip ribs tip channel 54 to include a tip inlet and tip outlet as disclosed in U.S. Pat. No. 6,059,530 to Lee to assist in dischargingcombustion gases 12 throughtip channel 54. - As shown in FIGS.2-5,
first tip rib 50 is preferably recessed fromfirst sidewall 28 to form atip shelf 56 substantially parallel to tipplate 48 as has been disclosed in the art to improve cooling oftip 38. Contrary to the tip rib configurations previously shown, where the tip ribs have been oriented substantially parallel toradial axis 17 throughout, the present invention preferably provides that alongitudinal axis 58 extending through first tip rib 50 (see FIG. 4) be formed at an angle θ toradial axis 17 for at least a designatedportion 60 of an axial length ofturbine blade 18. - Although angle θ may be substantially the same or fixed across designated
portion 60, it is preferred that angle θ vary across designatedportion 60 as demonstrated by the change in angle θ shown in FIGS. 4 and 5. In particular, angle θ is preferably at a minimum (approximately 0°) at or adjacent both leading and trailingedges midpoint 62 onfirst tip rib 50 as depicted in FIG. 4.Midpoint 62 is preferably located within designatedportion 60 offirst tip rib 50, which is identified as approximately between one-fourth to three-fourths the distance from leadingedge 32 to trailingedge 34. Due to the varying nature of angle θ, it preferably is within a range of approximately 0°-70°, more preferably within a range of approximately 20°-65°, and optimally within a range of approximately 40°-60° as it changes within designatedportion 60. - It will be appreciated that designated
portion 60 is an axial length ofairfoil 24 which preferably extends for approximately 5-95% of a chord throughairfoil 24. Designatedportion 60 more preferably extends for approximately 7-80% of a chord throughairfoil 24 and optimally extends for approximately 10-70% of a chord throughairfoil 24. - By orienting
first tip rib 50 in this manner, afirst recirculation zone 64 ofcombustion gases 12 is formed adjacent adistal end 66 offirst tip rib 50.First recirculation zone 64 then functions to reduce the leakage flow of combustion gases (identified by flow arrows 68) and, in effect, shrink the size of agap 70 betweenblade tip 38 andshroud 20 without risking a rub. Generally speaking, it will be understood thatrecirculation zone 64 increases in size as angle θ is increased. - It will further be appreciated that relationships exist between the height of
first tip rib 50, the depth oftip shelf 56, and angle θ betweenlongitudinal axis 58 andradial axis 17. In particular, a tangent of angle θ is substantially equivalent to the depth oftip shelf 56 divided by the height offirst tip rib 50. Thus, the greater angle θ becomes, the more depth oftip shelf 56 is required for a given rib tip height. Inherent limitations on tip shelf depth therefore translate into restrictions on angle θ. It will also be recognized that modifications in the height offirst tip rib 50 may be made sincerecirculation zone 64 serves to shrink the size ofgap 70 as noted hereinabove. This means that angle θ may increase by lessening the height offirst rib tip 50 for a given tip shelf depth, which also has the advantage of lessening the risk of a rub betweenfirst rib tip 50 andshroud 20. - It will also be appreciated that a
pocket 72 is formed between asurface 74 offirst tip rib 50 andtip shelf 56 which promotes asecond recirculation zone 76 ofcombustion gases 12 to be formed therein. Since a plurality of cooling holes 78 are preferably provided withintip shelf 56 to provide acooling film 80 along firsttip rib surface 74,pocket 72 andsecond recirculation zone 76 assist in maintainingcooling film 80 near first tip rib 50 (see FIG. 10A). Accordingly, the flow ofcombustion gases 12 is deflected byfirst tip rib 50 andcooling film 80 and pushed away fromgap 70. This flow deflection therefore results in increased flow resistance for the leakage flow throughgap 70 and maintains coolingfilm 80 to better coolfirst tip rib 50. - It will further be understood that
first tip rib 50 may be altered so as to be tapered longitudinally from a first end locatedadjacent tip plate 48 todistal end 66, as disclosed in U.S. Pat. No. 6,190,129 to Mayer et al., so as to increase the cooling conduction thereof.Distal end 66 offirst tip rib 50 may also be tapered in accordance with the teachings of U.S. Pat. No. 6,086,328 to Lee in order to reduce the thermal stress at such location so long asfirst recirculation zone 64 is preserved. - As depicted in FIG. 6,
first tip rib 50 may be inclined with respect toradial axis 17 and alongitudinal axis 82 ofsecond tip rib 52 may remain substantially parallel toradial axis 17. It is preferred, however, thatsecond tip rib 52 be oriented so as to be substantially parallel tofirst tip rib 50 as it extends from leadingedge 32 to trailingedge 34 at least within designated region 60 (see FIGS. 4 and 5) so that an angle J exists betweenlongitudinal axis 82 andradial axis 17. In this way, athird recirculation zone 84 is preferably formed at a distal end 86 ofsecond tip rib 52 similar tofirst recirculation zone 64 described with respect to first tip rib 50 (see FIG. 10B).Third recirculation zone 84 then assists in increasing the flow resistance throughgap 70 likefirst recirculation zone 64. Further, it will be noted that afourth recirculation zone 85 is generally formed within anarea 87 located betweenfirst tip rib 50 andsecond tip rib 52. Since recirculation ofhot combustion gases 12 exists inarea 87, one or more cooling holes 89 are preferably formed throughtip plate 48. - In fact, alternative embodiments depicted in FIGS. 7 and 8 illustrate that
second tip rib 52 may be angled with respect toradial axis 17 whilefirst tip rib 50 remains substantially parallel toradial axis 17. This angle φ may be at an acute angle in the upstream direction (herein referred to as the positive direction) as shown in FIG. 7 or at an acute angle with respect toradial axis 17 in the downstream direction (herein referred to as the negative direction) as shown in FIG. 8. It will be understood that angle φ will preferably have a range of approximately +60° to approximately −60°. It will also be noted from FIG. 8 thatsecond rib tip 52 may be recessed with respect tosuction sidewall 30 to form atip shelf 88 when inclined in the negative (downstream) direction. - Yet another alternative configuration involves the inclusion of a
third tip rib 90 located between first andsecond tip ribs third tip rib 90 is oriented so that alongitudinal axis 92 therethrough is substantially parallel toradial axis 17. - Having shown and described the preferred embodiment of the present invention, further adaptations of turbine blade and tip thereof can be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the invention. In particular, certain turbine blades in the art which twist from their leading edge to their trailing edge and/or from their root to the tip may also utilize the rib tip configurations presented herein with appropriate modification so as to create the desired recirculation zones for decreasing tip leakage flow.
Claims (25)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/196,623 US6672829B1 (en) | 2002-07-16 | 2002-07-16 | Turbine blade having angled squealer tip |
DE60321575T DE60321575D1 (en) | 2002-07-16 | 2003-07-16 | TURBINE BUCKET WITH A TILTED RIB AT THE TIP |
EP03816841A EP1529153B1 (en) | 2002-07-16 | 2003-07-16 | Turbine blade having angled squealer tip |
JP2005507636A JP4386891B2 (en) | 2002-07-16 | 2003-07-16 | Turbine blade having an inclined squealer tip |
PCT/US2003/022663 WO2005014978A1 (en) | 2002-07-16 | 2003-07-16 | Turbine blade having angled squealer tip |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/196,623 US6672829B1 (en) | 2002-07-16 | 2002-07-16 | Turbine blade having angled squealer tip |
Publications (2)
Publication Number | Publication Date |
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US6672829B1 US6672829B1 (en) | 2004-01-06 |
US20040013515A1 true US20040013515A1 (en) | 2004-01-22 |
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ID=29735375
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Application Number | Title | Priority Date | Filing Date |
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US10/196,623 Expired - Lifetime US6672829B1 (en) | 2002-07-16 | 2002-07-16 | Turbine blade having angled squealer tip |
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Country | Link |
---|---|
US (1) | US6672829B1 (en) |
EP (1) | EP1529153B1 (en) |
JP (1) | JP4386891B2 (en) |
DE (1) | DE60321575D1 (en) |
WO (1) | WO2005014978A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP1529153A1 (en) | 2005-05-11 |
WO2005014978A1 (en) | 2005-02-17 |
US6672829B1 (en) | 2004-01-06 |
JP2006511757A (en) | 2006-04-06 |
DE60321575D1 (en) | 2008-07-24 |
JP4386891B2 (en) | 2009-12-16 |
EP1529153B1 (en) | 2008-06-11 |
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