Patent Application
20220154589
This application claims priority to European Patent Application No. 20 207 344.1, filed on Nov. 13, 2020, the disclosure of which is incorporated herein by reference in its entirety.
Apparatuses and methods consistent with exemplary embodiments relate to cooling of gas turbines, and more particularly, to techniques for cooling inner shrouds of gas turbine vanes.
A gas turbine is a power engine that mixes air compressed by a compressor with fuel for combustion and rotates a turbine with high-temperature gas produced by the combustion. The gas turbine is used to drive a generator, an aircraft, a ship, a train, and so forth.
A gas turbine vane, also referred to as a nozzle, includes an airfoil extending radially between an inner shroud and an outer shroud, also referred to as inner platform and outer platform. The inner shroud and the outer shroud define parts of hot gas flow path through the turbine section and are immersed in hot gas during turbine operation. Thus, cooling of the shrouds is necessary.
Hot gas, also referred to as combustion product 34, flows from the combustor into the hot gas path 55 via the transition duct 17, and the airfoil 60 and surfaces of the outer and inner shrouds 90, 100, e.g., an upper surface 100a of the inner shroud 100, are immersed in hot gas34. Cooling air 5 is supplied from the compressor into the turbine vane 44 to cool the turbine vane 44.
Referring to
In addition, a portion 5b of cooling air 5 is transmitted through a second flow channel 9b to a turbine blade 38 located downstream of the turbine vane 44 via a cooling air channel 36c formed through a blade carrying disk 36. An interstage seal 80, also referred to as a radial seal such as a labyrinth seal 80, is disposed between the turbine vane 44 and the blade carrying disk 36, and is configured to block flow of cooling air 5 in a radial direction between a vane stage comprising the turbine vane 44 and a blade stage comprising the turbine blade 38 and the blade carrying disk 36.
However, a part of the inner shroud 100 in the second region R2 is not appropriately cooled. Therefore, there is a need to provide a mechanism or technique for effectively cooling the inner shroud of the gas turbine vane.
Aspects of one or more exemplary embodiments provide a technique for effectively cooling the inner shroud of the gas turbine to improve cooling without increasing an amount of cooling air from the compressor.
Additional aspects will be set forth in part in the description which follows and, in part, will become apparent from the description, or may be learned by practice of the exemplary embodiments.
According to an aspect of an exemplary embodiment, there is provided a turbine vane including: an inner shroud having an upper surface and a lower surface, a seal unit disposed in the lower surface of the inner shroud and defining a first region and a second region in the lower surface of the inner shroud, a first impingement unit arranged in the first region and comprising a first impingement plate facing the inner shroud defining a first impingement chamber therebetween, wherein the first impingement plate is configured to receive cooling air and form impingement jet directed to the first impingement chamber, a second impingement unit arranged in the second region and comprising a second impingement plate facing the inner shroud defining a second impingement chamber therebetween, and at least one connector flow channel configured to direct cooling air from the first impingement chamber to the second region, wherein the second impingement plate is configured to receive cooling air from the at least one connector flow channel and form impingement jet directed to the second impingement chamber.
The inner shroud may include a first impingement cavity in the lower surface of the inner shroud in the first region, and the first impingement chamber may include the first impingement cavity.
The inner shroud may include a second impingement cavity in the lower surface of the inner shroud in the second region, and the second impingement chamber may include the second impingement cavity.
The first impingement cavity and the second impingement cavity may be separated by an intervening section of the inner shroud. The at least one connector flow channel may extend through the intervening section of the inner shroud.
The second impingement plate may be arranged to be flush with an opening of the second impingement cavity. Alternatively, the second impingement plate may be arranged within the second impingement cavity.
The at least one connector flow channel may extend through the seal unit.
The seal unit may include at least one of a seal support lug extending radially inward from the lower surface of the inner shroud, and a seal plate supported at and arranged radially inward from the inner shroud. The at least one connector flow channel may extend through at least one of the seal support lug and the seal plate.
A width of the at least one connector flow channel may be between 2% and 40% of a width of the seal support lug or the seal plate measured along a circumferential direction of the inner shroud.
The second impingement unit may include a cover plate arranged radially inward the second impingement plate and facing the second impingement plate and defining a cooling air receiving chamber therebetween. An outlet of the at least one connector flow channel may be positioned in the cooling air receiving chamber.
The lower surface of the inner shroud in the first region may include a base opening of an airfoil of the turbine vane. The first impingement chamber and the base opening of the airfoil may be non-overlapping.
A radial distance of the second impingement plate from the lower surface of the inner shroud may be less than or equal to a radial distance of the first impingement plate from the lower surface of the inner shroud. A diameter of second impingement holes of the second impingement plate may be smaller than a diameter of first impingement holes of the first impingement plate.
The inner shroud may include at least one shroud cooling hole having an inlet positioned in the second impingement chamber and an outlet positioned in the upper surface of the inner shroud or in a side surface of the inner shroud.
According to an aspect of another exemplary embodiment, there is provided a gas turbine including: a compressor configured to compress air introduced thereinto from an outside; a combustor configured to mix fuel with air compressed by the compressor for combustion; and a turbine including a plurality of turbine vanes and a plurality of turbine blades mounted on blade carrying disks and rotated by combustion gas produced by the combustor. Each of turbine vane may include: an inner shroud having an upper surface and a lower surface; a seal unit disposed in the lower surface of the inner shroud and defining a first region and a second region in the lower surface of the inner shroud; a first impingement unit arranged in the first region and comprising a first impingement plate facing the inner shroud defining a first impingement chamber therebetween, wherein the first impingement plate is configured to receive cooling air and form impingement jet directed to the first impingement chamber; a second impingement unit arranged in the second region and comprising a second impingement plate facing the inner shroud defining a second impingement chamber therebetween; and at least one connector flow channel configured to direct cooling air from the first impingement chamber to the second region, wherein the second impingement plate is configured to receive cooling air from the at least one connector flow channel and form impingement jet directed to the second impingement chamber.
The inner shroud may include a first impingement cavity in the lower surface of the inner shroud in the first region, and the first impingement chamber may include the first impingement cavity.
The inner shroud may include a second impingement cavity in the lower surface of the inner shroud in the second region, and the second impingement chamber may include the second impingement cavity.
The first impingement cavity and the second impingement cavity may be separated by an intervening section of the inner shroud, and the at least one connector flow channel may extend through the intervening section of the inner shroud.
The second impingement plate may be arranged to be flush with an opening of the second impingement cavity, or the second impingement plate may be arranged within the second impingement cavity.
The at least one connector flow channel may extend through the seal unit.
The gas turbine may further include an interstage seal axially disposed between the blade carrying disk and the turbine vane. The second impingement unit may be positioned in a space defined by the inner shroud of the turbine vane, the seal unit and the interstage seal, and the interstage seal may be configured to seal the space at radially inner side of the space.
The first impingement plate may be configured to receive cooling air from a last stage of the compressor.
The above and other aspects will become more apparent from the following description of the exemplary embodiments with reference to the accompanying drawings, in which:
Various modifications and various embodiments will be described below in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the disclosure. It should be understood, however, that the various embodiments are not for limiting the scope of the disclosure to the specific embodiment, but they should be interpreted to include all modifications, equivalents, and alternatives of the embodiments included within the spirit and scope disclosed herein.
The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of the disclosure. The singular expressions “a”, “an”, and “the” are intended to include the plural expressions as well unless the context clearly indicates otherwise. In the disclosure, terms such as “comprises”, “includes”, or “have/has” should be construed as designating that there are such features, integers, steps, operations, components, parts, and/or combinations thereof, not to exclude the presence or possibility of adding of one or more of other features, integers, steps, operations, components, parts, and/or combinations thereof.
Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. For example, the expression, “at least one of a, b, and c,” should be understood as including only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or any variations of the aforementioned examples.
Further, terms such as “first,” “second,” and so on may be used to describe a variety of elements, but the elements should not be limited by these terms. The terms are used simply to distinguish one element from other elements. The use of such ordinal numbers should not be construed as limiting the meaning of the term. For example, the components associated with such an ordinal number should not be limited in the order of use, placement order, or the like. If necessary, each ordinal number may be used interchangeably.
Hereinafter, exemplary embodiments will be described below in detail with reference to the accompanying drawings. It should be noted that like reference numerals refer to like parts throughout the various figures and exemplary embodiments. In certain embodiments, a detailed description of functions and configurations well known in the art may be omitted to avoid obscuring appreciation of the disclosure by a person of ordinary skill in the art. For the same reason, some components may be exaggerated, omitted, or schematically illustrated in the accompanying drawings.
The compressor section 14 may suck air 24 through the air inlet 12, compress the air, and supply the compressed air to the combustion section 16. The combustion section 16 may include a burner plenum 26, one or more combustion chambers 28 and at least one burner 30 fixed to each combustion chamber 28. The combustion chambers 28 and the burners 30 may be located inside the burner plenum 26. The compressed air passing through the compressor section 14 may enter a diffuser 32 and exit the burner plenum 26, where a portion of the air may enter the burner 30 and mix with a gas or liquid fuel. The air/fuel mixture is burned and combustion gas 34 discharged from the combustion section 16 is supplied to the turbine section 18 via a transition duct 17.
A plurality of combustors constituting the combustion section 16 may be arranged in a form of a shell in a housing. Each of the combustors may include the burner 30 having a fuel injection nozzle and the like, a combustor liner defining the combustion chamber 28, and the transition duct 17 serving as a connector between the combustion section 16 and the turbine section 18.
The turbine section 18 may include a plurality of blade carrying disks 36 attached to the shaft 22.
The combustion gas discharged from the combustion chamber 28 is supplied to the turbine section 18. The supplied combustion gas expands and applies impingement or reaction force to turbine blades 38 to generate rotational torque. That is, the supplied combustion gas drives the turbine blades 38 which in turn rotates the shaft 22. A portion of the rotational torque is transmitted to the compressor section 14, and remaining portion which is the excessive torque is used to drive a generator or the like.
The compressor section 14 may be driven by some of power output from the turbine section 18. The compressor section 14 may include an axial series of vane stages 46 and rotor blade stages 48. The rotor blade stages 48 may include a rotor disc supporting an annular array of blades. The compressor section 14 may further include a casing 50 that surrounds the rotor stages and supports the vane stages 48. The vane stages 46 may include an annular array of radially extending compressor vanes mounted to the casing 50 in such a way that the compressor vanes form each stage. The compressor vanes guide the compressed air transferred from compressor blade disposed at a preceding stage, to compressor blade disposed at a following stage. In an exemplary embodiment, at least some of the compressor vanes may be mounted so as to be rotatable within a predetermined range, e.g., to adjust the inflow rate of air. The casing 50 may define a radially outer surface 52 of a passage 56 of the compressor section 14. A radially inner surface 54 of the passage 56 may be defined at least in part by a rotor drum 53 of the rotor which may be defined in part by the annular array of blades 48.
The exemplary embodiment shows the gas turbine having a single shaft connecting single/multi-stage compressor and single/one or more stage turbine, and it is understood that two or three shaft engines may be included in one or more other embodiments.
The terms upstream and downstream refer to the flow direction of the airflow and/or working gas flow through the gas turbine. The terms forward and rearward refer to the flow direction of hot gas through the gas turbine. The terms axial, radial and circumferential are made with reference to the rotational axis 20 of the gas turbine.
Referring to
Referring to
The inner shroud 100 has an upper surface 100a and a lower surface 100b. The turbine vane 1 may include the airfoil 60 extending from the upper surface 100a of the inner shroud 100 to the outer shroud 90.
The inner shroud 100 may be a radially inner shroud 100 with respect to the rotational axis 20 of the gas turbine 10. The inner shroud 100 forms a radially inner surface 54 of an annular hot gas flow path 55 of the turbine 10. The outer shroud 90 may be a radially outer shroud 90 with respect to the rotational axis 20 of the gas turbine 10. The outer shroud forms a radially outer surface 54 of the annular hot gas flow path 55 of the turbine 10. The inner and the outer shrouds 100, 90 define the hot gas flow path 55, i.e., the annular shape of the gas flow path, through which the combustion gas 34 flows in the turbine section 18 of the gas turbine 10.
The upper surface 100a of the inner shroud 100 faces the hot gas path 55, and the lower surface 100b of the inner shroud 100 faces the rotational axis 20 of the gas turbine 10. The upper surface 100a and the lower surface 100b of the inner shroud 100 are radially spaced apart and face opposite directions.
Referring to
The pressure-wall side 102, the suction-wall side 104, the leading-edge side 106 and the trailing-edge side 108 of the inner shroud 100 may correspond to the pressure wall 62, the suction wall 64, the leading edge 66 and the trailing edge 68 of the airfoil 60, respectively.
The seal unit 70 is disposed at the lower surface 100b of the inner shroud 100 and defines a first and a second regions R1, R2 at the lower surface 100b of the turbine vane 1. The seal unit 70 seals the first region R1 from the second region R2 with respect to a flow of cooling air 5 from the first region R1 to the second region R2. The turbine vane 1 and the seal unit 70 may be referred to a turbine vane arrangement.
The seal unit 70 may be disposed between the leading-edge side 106 and the trailing-edge side 108, i.e., spaced apart from the leading-edge side 106 and the trailing-edge side 108 and extending from the pressure-wall side 102 to the suction-wall side 104 of the inner shroud 100. Thus, the seal unit 70 defines the first region R1 between the leading-edge side 106 and the seal unit 70 and the second region R2 between the seal unit 70 and the trailing-edge side 108 at the lower surface 100b of the inner shroud 100.
For example, the seal unit 70 defines the first region R1 between the leading-edge side 106, the pressure-wall side 102, the suction-wall side 104 and the seal unit 70, and the second region R2 between the seal unit 70, the trailing-edge side 108, the pressure-wall side 102 and the suction-wall side 104 at the lower surface 100b of the inner shroud 100.
An upper surface of the first and the second regions R1, R2 may be defined by the lower surface 100b of the inner shroud 100.
Referring to
The first impingement plate 112 may include a plurality of first impingement holes 112h, i.e., through-holes, for generating impingement jets. The first impingement plate 112 receives cooling air 5from the compressor section 14 and forms impingement jets as the cooling air 5 passes through the first impingement holes 112h. The impingement jets are ejected into the first impingement chamber 110c. The impingement jets impinge on the surface of the inner shroud 100, e.g., the lower surface 100b of the inner shroud 100, thereby cooling the inner shroud 100, i.e., a first portion of the inner shroud 100 corresponding to the first region R1.
The second impingement unit 120 arranged in the second region R2 includes a second impingement plate 122 facing the lower surface 100b of the inner shroud 100.
The second impingement plate 122 is radially spaced apart from the lower surface 100b of the inner shroud 100. A second impingement chamber 120c is defined between the lower surface 100b of the inner shroud 100 and the second impingement plate 122 in the second region R2.
The first and second impingement units 110, 120 may be spaced apart from each other by the seal unit 70 and/or by an intervening section 101 of the inner shroud 100.
Referring to
The connector flow channel 130 may be formed as a tubular structure or tube or a through-hole or hollow piping, i.e., a pipe.
The second impingement plate 122 may include a plurality of second impingement holes 122h, i.e., through-holes, for generating impingement jets. The second impingement plate 122 receives cooling air 5 from the first impingement chamber 110c via the connector flow channel 130 and forms impingement jets as the cooling air 5 passes through the second impingement holes 122h. The impingement jets are ejected into the second impingement chamber 120c. The impingement jets impinge on the surface of the inner shroud 100, e.g., the lower surface 100b of the inner shroud 100, thereby cooling the inner shroud 100, i.e., a second portion of the inner shroud 100 corresponding to the second region R2.
For example, the cooling air 5 flows towards the first impingement plate 112, passes through the first impingement holes 112h to generate impingement jets that is ejected into the first impingement chamber 110c toward the inner shroud 100, flows into the inlet 132 of the connector flow channel 130 and through the connector flow channel 130 from the first impingement chamber 110c to the second region R2, exits the outlet 134 of the connector flow channel 130 in the second region R2, flows toward the second impingement plate 122, and passes through the second impingement holes 122h to generate impingement jets that is ejected into the second impingement chamber 120c toward the inner shroud 100.
Therefore, as shown in
Because the lower surface 100b of the inner shroud 100 is cooled both the first and the second regions R1, R2 by impingement cooling, the cooling efficiency is improved. Further, the same portion or volume of the cooling air is used for impingement cooling in both the first and the second regions R1, R2, so that there is no need to draw additional cooling air from the compressor for separate cooling of the portion of the inner shroud corresponding to the second region R2.
In
The second impingement unit 120 may be positioned within a space 82 defined by the inner shroud 100 of the turbine vane 1, the seal unit 70 and the interstage seal 80, and a platform of the blade 38 and blade carrying disk 36.
Referring to
The first impingement unit 110 may be formed such that the first impingement chamber 110c has an outlet for cooling air via the connector flow channel 130, preferably, via only the inlet 132 of the connector flow channel 130. That is, there is no other outlet for ejecting cooling air to outside of the first chamber 110c except through the connector flow channel 130 in the first impingement chamber 110c. However, it is understood that the configuration of the first impingement chamber 110c is not limited to example described above and may be changed or vary according to one or more other exemplary embodiments. For example, there is a cooling hole extending from the first impingement chamber 110c into the hot gas path 55.
The second impingement unit 120 may be formed such that the second impingement chamber 120c has an inlet for cooling air via the second impingement holes 122h, preferably, only via the second impingement holes 122h. That is, the second impingement chamber 120c has no other inlet for receiving cooling air except the second impingement holes 122h. However, it is understood that the configuration of the second impingement chamber 120c is not limited to example described above and may be changed or vary according to one or more other exemplary embodiments.
The second impingement unit 120 may include a cover plate 124 disposed radially inward of the second impingement plate 122 and facing the second impingement plate 122. That is, the cover plate 124 may be disposed between the second impingement plate 122 and the rotational axis 20 of the gas turbine 10. The cover plate 124 may be radially spaced apart from the second impingement plate 122 to define a cooling air receiving chamber 124c therebetween, i.e., between the second impingement plate 122 and the cover plate 124.
The second impingement chamber 120c may be disposed radially outward of the cooling air receiving chamber 124c and may be radially aligned. The second impingement chamber 120c and the cooling air receiving chamber 124c may be fluidly connected only by the second impingement holes 122h.
The cooling air receiving chamber 124c may be formed such that the cooling air receiving chamber 124c has an inlet for cooling air via the connector flow channel 130, preferably, only via the connector flow channel 130. That is, the cooling air receiving chamber 124c has no other inlet for receiving cooling air except the connector flow channel 130, e.g., the outlet 134 of the connector flow channel 130. However, it is understood that the configuration of the cooling air receiving chamber 124c is not limited to example described above and may be changed or vary according to one or more other exemplary embodiments.
The cooling air receiving chamber 124c may be formed such that the cooling air receiving chamber 124c has an outlet for cooling air via the second impingement holes 122h, preferably, only via the second impingement holes 122h. That is, the cooling air receiving chamber 124c has no other outlet for ejecting cooling air except the second impingement holes 122h. However, it is understood that the configuration of the cooling air receiving chamber 124c is not limited to example described above and may be changed or vary according to one or more other exemplary embodiments.
Referring to
As shown in
The first impingement plate 112 may be positioned at an opening C11 of the first impingement cavity C1. In other words, the first impingement plate 112 may be formed as a flat sheet or planar surface and may be flush with the opening C11 of the first impingement cavity C1, i.e., completely covers the opening C11 of the first impingement cavity C1. That is, the first impingement plate 112 may completely seal the opening C11 of the first impingement cavity C1 except for the cooling air flowing through the first impingement holes 112h.
Alternatively, the first impingement plate 112 may be positioned outside the first impingement cavity C1, i.e., radially spaced apart from the opening C11 of the first impingement cavity C1. The first impingement unit 110 may include flanking plate members 112s that extend radially between the first impingement plate 112 and the lower surface 100b of the inner shroud 100 surrounding the first impingement cavity C1 with the first impingement chamber 110c. The first impingement plate 112 and the flanking plate member 112s may completely seal the opening C11 of the first impingement cavity C1 except for the cooling air flowing through the first impingement holes 112h.
Also, the first impingement plate 112 may be positioned radially inside the first impingement cavity C1, i.e., between the lower surface 100b of the inner shroud 100 and the opening C11 of the first impingement cavity C1. The first impingement plate 112 may completely seal a portion of the first impingement cavity C1 disposed between the first impingement plate 112 and the lower surface 100b of the inner shroud 100 except for the cooling air flowing through the first impingement holes 112h.
Here, the lower surface 100b of the inner shroud 100 in the second region R2 may include a second impingement cavity C2. In other words, the second impingement chamber 120c may include the second impingement cavity C2.
The second impingement plate 122 may be positioned at or within or outside the second impingement cavity C2.
The second impingement plate 122 may be positioned at an opening C21 of the second impingement cavity C2. In other words, the second impingement plate 122 may be formed as a flat sheet planar surface and may be flush with the opening C21 of the second impingement cavity C2, i.e., completely covers the opening C21 of the second impingement cavity C2. That is, the second impingement plate 122 may completely seal the opening C21 of the second impingement cavity C2 except for the cooling air flowing through the second impingement holes 122h.
Alternatively, the second impingement plate 122 may be positioned outside the second impingement cavity C2, i.e., radially spaced apart from the opening C21 of the second impingement cavity C2. The second impingement unit 120 may include flanking plate members 122s that extend radially between the second impingement plate 122 and the lower surface 100b of the inner shroud 100 surrounding the second impingement cavity C2 with the second impingement chamber 120c. The second impingement plate 122 and the flanking plate members 122s may completely seal the opening C21 of the second impingement cavity C2 except for the cooling air flowing through the second impingement holes 122h.
Also, the second impingement plate 122 may be positioned radially inside the second impingement cavity C2, i.e., between the lower surface 100b of the inner shroud 100 and the opening C21 of the second impingement cavity C2. The second impingement plate 122 may completely seal a portion of the second impingement cavity C2 disposed between the second impingement plate 122 and the lower surface 100b of the inner shroud 100 except for the cooling air flowing through the second impingement holes 122h.
The cover plate 124 may be positioned at the opening C21 of the second impingement cavity C2. In other words, the cover plate 124 may be formed as a flat sheet or planar surface and may be flush with the opening C21 of the second impingement cavity C2, i.e., completely covers the opening C21 of the second impingement cavity C2. That is, the cover plate 124 may completely seal a portion of the second impingement cavity C2 disposed between the second impingement plate 122 and the cover plate 124 of the inner shroud 100 except for the cooling air flowing through the second impingement holes 122h.
Referring to
The seal support lug 72 may extend radially inward from the lower surface 100b of the inner shroud 100. The seal support lug 72 may define the first region R1 and the second region R2. The connector flow channel 130 may extend through the seal support lug 72. The seal plate 74 may be supported at or attached to the seal support lug 72, preferably at a radially outer end of the seal plate 74. A radially inner end of the seal plate 74 may be supported by a seal housing. The connector flow channel 130 may be formed as a through-hole passing through the seal support lug 72, or may be formed as a separate tubular structure or tube inserted through a through-hole formed in the seal support lug 72.
The seal plate 74 may not have any connector flow channel formed therethrough. Alternatively, a further connector flow channel may extend through the seal plate 74.
The seal plate 74 may extend radially inward from the lower surface 100b of the inner shroud 100 or from the seal support lug 72. The seal plate 74 may define the first region R1 and the second region R2. The connector flow channel 130 may extend through the seal plate 74. The seal plate 74 may be supported at or attached to the lower surface 100b of the inner shroud 100 or to the seal support lug 72, preferably at a radially outer end of the seal plate 74. A radially inner end of the seal plate 74 may be supported by a seal housing. The connector flow channel 130 may be formed as a through-hole passing through the seal plate 74, or may be formed as a separate tubular structure or tube inserted through a through-hole formed in the seal plate 74.
The seal support lug 72 may not have any connector flow channel formed therethrough. Alternatively, a further connector flow channel may extend through the seal support lug 72.
Referring to
The seal unit 70, preferably at least one, more preferably both of seal support lug 72 and the seal plate 74, may be aligned with the intervening section 101 of the inner shroud 100 in the radial direction.
Referring to
A diameter of second impingement holes 122h of the second impingement plate 122 may be smaller than a diameter of the first impingement holes 112h of the first impingement plate 112.
Referring to
The cooling air from the shroud cooling hole 100h may be ejected into the hot gas path 55. The outlet 100hb of the shroud cooling hole 100h may be positioned at the hot gas path 55.
As shown in
Here, the shroud cooling holes 100h may be straight through-holes with respect to the lower surface 100b and the upper surface 100a of the inner shroud 100. That is, the shroud cooling holes 100h may be radially aligned or radially extended. Alternatively, the shroud cooling holes 100h may be straight through-holes with respect to the lower surface 100b and the side surface 100s of the inner shroud 100. That is, the shroud cooling holes 100h may be axially aligned or axially extended.
As shown in
Referring to
The first impingement chamber 110c and the base opening 61 of the airfoil 60 may be non-overlapping or discontinuous with respect to each other. In other words, the first impingement chamber 110c and the base opening 61 of the airfoil 60 are fluidly separated from each other. That is, the cooling air 5 introduced into the first impingement chamber 110c does not flow into the base opening 61 of the airfoil 60.
For example, the first impingement plate 112 may be configured to receive cooling air 5 from a last stage of the compressor section 14.
As shown in
The second impingement plate 122 may be disposed between the lower surface 100b of the inner shroud 100 and the cover plate 124. A distance between the lower surface 100b of the inner shroud 100 and the cover plate 124 in the second region R2 may be greater than a distance between the lower surface 100b of the inner shroud 100 and the first impingement plate 112 in the first region R1.
As shown in
The second impingement plate 122 may be disposed between the lower surface 100b of the inner shroud 100 and the cover plate 124.
The connector flow channel 130 may be inclined, i.e., inclined from the inlet 132 to the outlet 134 toward the rotational axis of the gas turbine. In other words, the connector flow channel 130 may be formed to be inclined from a radially outer position in the first region R1 to a radially inner position in the second region R2. That is, the connector flow channel 130 may be inclined such that the inlet 132 is disposed at a radially outer position in the first region R1 and the outlet 134 is disposed at a radially inner position in the second region R2.
As shown in
The first part of the first impingement plate 112 may be flush with the cover plate 124, and the second part of the first impingement plate 112 may be flush with the second impingement plate 122.
While one or more exemplary embodiments have been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various variations and modifications may be made by adding, changing, or removing components without departing from the spirit and scope of the disclosure as defined in the appended claims, and these variations and modifications fall within the spirit and scope of the disclosure as defined in the appended claims. Accordingly, the description of the exemplary embodiments should be construed in a descriptive sense only and not to limit the scope of the claims, and many alternatives, modifications, and variations will be apparent to those skilled in the art.
| Number | Date | Country | Kind |
|---|---|---|---|
| 20207344.1 | Nov 2020 | EP | regional |
