JP5852190B2 - End wall member and gas turbine - Google Patents

Description

  The present invention relates to an end wall member that separates a flow path through which a fluid flows from the outside and a gas turbine including the end wall member.

  The gas turbine is a combustion gas flow path of a turbine in which stationary blades and moving blades are alternately arranged, as combustion gas, which is a high-temperature fluid generated by mixing compressed air in a compressor with fuel in a combustor. By introducing into the interior and rotating the rotor blades and the rotor, the combustion gas energy is output as rotational energy, and a rotational driving force is applied to the compressor and the generator.

  In the combustion gas flow path, the end wall members are arranged in the circumferential direction and the axial direction to form an end wall, and the combustion gas flow path along the axial direction is separated from the outside. Is distributed. Specifically, on the inner peripheral side of the combustion gas flow path, inner shrouds attached to the tip of the stationary blade are arranged in an annular shape in the circumferential direction, and at the positions adjacent to the combustion gas flow path, the blade base is located. The end walls attached to the ends are annularly arranged in the circumferential direction, and the end walls are formed by alternately arranging the inner shrouds and the annular bodies of the end walls in the axial direction. In addition, on the outer periphery side of the combustion gas flow path, outer shrouds attached to the base end of the stationary blade are annularly arranged in the circumferential direction, and adjacent positions along the combustion gas flow path are divided in an arc shape. The end walls are configured by annularly arranging the rings in the circumferential direction and alternately arranging the annular bodies of the outer shroud and the split rings in the axial direction. These members are usually formed by casting, and the corner portions are rounded as necessary. In addition, a gap is formed in the axial direction between the end wall members, and by supplying sealing air from the outside to the combustion gas passage side through the gap, the combustion gas flows from the combustion gas passage side to the outside. Leakage is prevented and the members arranged outside and the side end walls of the gap are prevented from becoming hot (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-6446

  However, according to the gas turbine of Patent Document 1, a part of the high-temperature combustion gas flowing in the vicinity of the end wall member in the combustion gas flow path is on the upstream side of the combustion gas flow path of the end wall member facing the flow of the combustion gas. It collides with the edge and flows into the gap between the end wall members along the end surface.

Details will be described below with reference to the drawings. FIG. 10 shows the details of the inner peripheral side of the combustion gas flow path F. A gap 103 is formed between the inner shroud 101 of the stationary blade and the end wall 102 of the moving blade as end wall members along the combustion gas flow path F. Are arranged. In the combustion gas flow path F, a part of the high-temperature combustion gas G flowing in the vicinity of the inner shroud 101 and the end wall 102 is located on the upstream side of the end wall 102 that is located on the downstream side and faces the flow of the combustion gas G. Will flow into the gap 103 where the sealing air S cooler than the combustion gas G is sent out. In particular, when round processing is performed on the edge portion 102 a as corner processing, the combustion gas G collides with the curved surface 104 having a circular arc shape formed by the round processing, and faces the inner shroud 101 from the curved surface 104. It will flow into the gap 103 along the end face 102b. When the combustion gas G flows into the gap 103 in this way, the inside of the gap 103, that is, the outside of the combustion gas flow path F becomes hot, and the inner shroud 101, the end wall 102, etc. constituting the end wall There was a problem that an end wall member became high temperature.
This also applies to turbomachines other than gas turbines that use high-temperature combustion gas as the working fluid. These flow paths also form gaps between end wall members that form end walls and are adjacent to the flow paths. The fluid flowing through the flow channel collides with the edge on the upstream side of the flow channel and flows into the gap, which may cause the same problem.

  The present invention has been made in view of the above-described circumstances, and the inflow of the fluid flowing through the flow path to the gap between the end wall members adjacent to each other along the flow path is configured. An end wall member capable of being suppressed and a gas turbine are provided.

The present invention employs the following means in order to solve the above problems.
The present invention is an end wall member that is disposed along a flow path with a gap between adjacent members, and separates the flow path from the outside, the end wall surface facing the flow path, and the flow An upstream end face facing a member adjacent to the upstream side of the road, a connection face that connects the upstream end face and the end wall surface, and a fluid that flows mainly through the flow path collides with the connection face. A separation portion is provided for separating the fluid flowing toward the upstream end surface along the connection surface after colliding with the connection surface, and the connection surface is linear in a plane formed along the flow path. And is inclined with respect to each of the upstream end surface and the end wall surface.

According to this configuration, a part of the fluid flowing through the flow path hits the connection surface connecting the upstream end surface and the end wall surface facing the fluid flow in the end wall member, and flows along the connection surface. In addition, by being peeled off by the peeling portion, it is possible to suppress backflow along the upstream end face and flow into a gap between adjacent members.
Moreover, the fluid which flows along a connection surface can be effectively peeled by a ridgeline because the connection surface is formed so that it may become linear within the plane formed along the flow path.

  In the above end wall member, it is preferable that the fluid peeled off by the peeling portion is mixed with sealing air flowing through the gap toward the flow path.

  According to this configuration, the separated fluid is mixed with the seal air, so that it is possible to prevent the fluid flowing mainly through the flow path from flowing into the gap.

  In the above end wall member, it is preferable that the end wall surface of the end wall member has a portion protruding from the front edge of the blade to the connection surface.

  The present invention is configured as an end wall (an inner shroud, an outer shroud, an end wall, a split ring, etc.) of a wing, and a part of the end wall surface extends from the leading edge of the wing to the connection surface. The flow that flows into the gap from the blade leading edge toward the connection surface can be effectively suppressed.

In the above end wall member, the flow path may be a flow path through which a working fluid of the gas turbine flows, and seal air may flow through the gap.
Further, in the above end wall member, the working fluid may be a combustion gas.

Moreover, the gas turbine of this invention is provided with said end wall member, It is characterized by the above-mentioned.
In the present invention, since the end wall member can be prevented from being heated by the fluid by using the end wall member, the reliability of the gas turbine is improved along with the fluid temperature, and the gap is circulated. Efficiency can be improved by minimizing the sealing air.

According to the end wall member of the present invention, it is possible to suppress the inflow of the fluid flowing through the flow path to the gap between the end wall members that constitute the end wall of the flow path and are adjacent to each other along the flow path.
Further, according to the gas turbine of the present invention, the end wall member can improve the efficiency.

The present invention employs the following means in order to solve the above problems.
The present invention is an end wall member that is disposed along a flow path with a gap between adjacent members, and separates the flow path from the outside, the end wall surface facing the flow path, and the flow An upstream end face facing a member adjacent to the upstream side of the road, a connection face that connects the upstream end face and the end wall surface, and a fluid that flows mainly through the flow path collides, and the upstream end face is The fluid is arranged on the downstream side of the flow path with respect to the adjacent member through the gap, and the fluid flowing to the upstream end surface along the connection surface after colliding with the connection surface is separated from the connection surface. peeling unit for is provided by the connection surface is formed to be flat in the passage plane formed along the, be inclined with respect to each of the upstream end surface and said end wall It is characterized by.

An embodiment according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, a gas turbine 1 includes a compressor 2 that generates compressed air, a combustor 3 that generates fuel gas G by supplying fuel to the compressed air supplied from the compressor 2, and a turbine static The blades 4 and the turbine rotor blades 5 are alternately disposed, and the turbine 7 rotates the rotor 6 to which the turbine rotor blades 5 are attached by the combustion gas supplied from the combustor 3. In the turbine 7, the inside of a cylindrical casing 8 disposed coaxially with the axis O of the rotor 6 is used as a combustion gas flow path F. The combustion gas flow path F is separated from the casing 8 by a cylindrical outer peripheral end wall 10 provided on the inner peripheral side of the casing 8 on the outer peripheral side, and on the outer peripheral side of the rotor 6 on the inner peripheral side. It is separated from the rotor 6 by a cylindrical inner peripheral side end wall 11 provided on the inner wall, and forms a flow path along the direction of the axis O having a donut cross section. In the combustion gas flow path F, a plurality of turbine stationary blades 4 and turbine rotor blades 5 at each stage are radially arranged.

  Here, each of the outer peripheral side end wall 10 and the inner peripheral side end wall 11 forms a circular body by arranging a plurality of arc-shaped end wall members 20 in an annular shape in the circumferential direction. It is configured by arranging a plurality in the direction. More specifically, as shown in FIGS. 1 and 2, in the inner peripheral side end wall 11, the end wall member 20 includes an inner shroud 21 attached to a tip on the inner peripheral side of the turbine stationary blade 4, turbine operation It is comprised by the end wall 22 attached to the base end used as the inner peripheral side of the wing | blade 5. FIG. That is, by arranging the turbine stationary blades 4 at each stage radially, the inner shroud 21 attached to the tip of each turbine stationary blade 4 is connected in an annular shape to form an annular body. Further, by arranging the turbine blades 5 of each stage radially, the end wall 22 attached to the base end of each turbine blade 5 is connected in an annular shape to form an annular body. And the annular body of the inner shroud 21 and the annular body of the end wall 22 are alternately arranged in the direction of the axis O, whereby the cylindrical inner peripheral side end wall 11 is configured. Further, a gap 23 is provided between the inner shroud 21 and the end wall 22 adjacent to each other along the combustion gas flow path F (axis O), and the compressed air extracted from the compressor 22 is sealed air S. As a result, the combustion gas G, which is a fluid that flows through the combustion gas flow path F as a main flow, flows through the gap 23 from the inner peripheral side and flows into the combustion gas flow path F. To prevent leakage.

  Similarly, as shown in FIG. 1, in the outer peripheral side end wall 10, the end wall member 20 includes an outer shroud 24 attached to the base end on the outer peripheral side of the turbine stationary blade 4 and the tip of the turbine rotor blade 5. It is comprised by the division | segmentation ring 25 arrange | positioned facing the outer peripheral side. That is, the outer shroud 24 attached to the base end of each turbine vane 4 is connected in an annular shape to form an annular body, and the split ring 25 facing the outer peripheral side of the turbine rotor blade 5 is connected in a plurality of annular shapes. Thus, an annular body is formed, and these are alternately arranged in the direction of the axis O, whereby the cylindrical outer end wall 10 is formed. In addition, the outer shroud 24 and the split ring 25 adjacent along the combustion gas flow path F (axis O) are provided with a gap between them, and the compressed air extracted from the compressor 2 is the outer periphery as seal air. By flowing through the gap from the side and flowing into the combustion gas passage F, the combustion gas G that is a fluid flowing through the combustion gas passage F is prevented from leaking to the outer peripheral side where the casing 8 is located. .

  Next, with reference to FIG.2 and FIG.3, the detail of the connection part of the end wall 22 and the inner shroud 21 adjacent to the upstream of the combustion gas flow path F of this end wall 22 is demonstrated. As shown in FIGS. 2 and 3, a gap 23 is formed between the end wall 22 and the inner shroud 21 for circulating the sealing air S described above. The end wall 22 faces the combustion gas flow path F and has an end wall face 26 provided with the turbine rotor blade 5 protruding therefrom, and an upstream end face facing the inner shroud 23 that is a member adjacent to the upstream side of the combustion gas flow path F. 27, a connection surface 28 that connects the end wall surface 26 and the upstream end surface 27, and an arm portion 29 that protrudes from the upstream end surface 27. The arm portion 29 projects to the upstream side of the combustion gas flow path F at a position on the radially inner peripheral side of the inner shroud 21. A honeycomb seal 31 is provided between the inner peripheral surface of the inner shroud 21 and the arm portion 29 of the end wall 22 facing each other. For this reason, the combustion gas G has a higher pressure on the inner peripheral side than the honeycomb seal 31 due to the honeycomb seal 31 and on the combustion gas flow path F side. The seal air S leaking to 23 flows into the combustion gas flow path F through the gap 23, so that the inflow into the gap 23 itself is regulated.

  Further, the end wall surface 26 is formed in an arc shape in a plane orthogonal to the axis O and linearly in a plane including the axis O, that is, to form a part of the outer peripheral surface of the cylinder. In addition, the base end of the turbine blade 5 is curved to form a fillet 26 a and is connected to the turbine blade 5. Further, the end wall surface 26 is provided such that a flat surface portion thereof projects to the upstream side of the combustion gas flow path F with respect to the front edge 5 a of the turbine rotor blade 5, and is connected to the upstream end surface 27 via the connection surface 28. Has been. Here, in the present embodiment, the connection surface 28 is arcuate in a plane orthogonal to the axis O and linear in a plane including the axis O (a plane orthogonal to the end wall surface 26 and the upstream end surface 27). It is formed so as to constitute a part of the outer peripheral surface of the cone. The connection surface 28 is formed with ridge lines 28 a and 28 b between the end wall surface 26 and the upstream end surface 27, and is upstream along the connection surface 28 by the ridge line 28 b between the connection surface 28 and the upstream end surface 27. A peeling portion 30 for peeling a fluid such as a gas flowing toward the side end face 27 is configured.

That is, in the combustion gas G flowing mainly in the combustion gas flow path F, a part of the combustion gas G flowing in the vicinity of the inner peripheral side end wall 11 forms a connection surface 28 that is upstream of the combustion gas flow path F of the end wall 22. Will hit the edge. Since the connection surface 28 is formed, a part of the combustion gas G1 flows toward the end wall surface 26 and flows again along the combustion gas flow path F. Further, the other combustion gas G <b> 2 flows along the connection surface 28 toward the upstream end surface 27. Here, since the ridge line 28b is formed as the separation portion 30 between the connection surface 28 and the upstream end surface 27, the other combustion gas G2 along the connection surface 28 is separated at the ridge line 28b. It is possible not to flow along the upstream end face 27.
Next, the results of CFD analysis for the example of the end wall 22 constituting the isolation member 20 of the present invention and the comparative example of the conventional technique will be described.

  4A and 4B show details of the connection portion between the end wall and the inner shroud that are subjected to the CFD analysis. FIG. 4A shows an example, and FIG. 4B shows a comparative example. As shown in FIG. 4 (a), the end wall 22 of the embodiment according to the present invention has an angle formed by the upstream end surface 27 and the end wall surface 26 set to 90 degrees, and a connection surface provided therebetween. 28 is set to 40 degrees, and the height H28 along the radial direction of the connecting surface 28 from the ridge line 28b to the end wall surface 26 with respect to the upstream end surface 27 is set to 4 mm. Has been. Further, the width W1 along the axis O direction of the gap 23 between the end wall 22 and the inner shroud 21 is 12 mm, and the distance along the axis O direction from the inner shroud 21 to the ridge line 28a between the end wall surface 26 and the connection surface 28. W2 is set to 17 mm, and a distance W3 along the axis O direction from the inner shroud 21 to the front edge 5a of the turbine rotor blade 5 is set to 19 mm.

  On the other hand, as shown in FIG. 4B, in the end wall 22 ′ of the comparative example according to the prior art, the connection surface 28 ′ connecting the upstream end surface 27 and the end wall surface 26 is formed with a curved surface having an arcuate cross section. The curvature radius R28 'is set to 4 mm. The width W1 ′ along the axis O direction of the gap 23 ′ between the end wall 22 ′ and the inner shroud 21 ′ is set to be the same as the width W1 along the axis O direction of the embodiment. The distance W2 ′ along the axis O direction from the inner shroud 21 ′ to the position where the connection surface 28 ′ and the end wall surface 26 are connected is the same as the width W2 along the axis O direction of the embodiment. Yes. Further, the distance W3 ′ along the axis O direction from the inner shroud 21 ′ to the front edge 5a of the turbine rotor blade 5 is set to be the same as the width W3 along the axis O direction of the embodiment.

  Next, the CFD analysis result will be described with reference to FIGS. Here, FIG. 5 is a fluid flow diagram based on the CFD analysis result in a cross section at an intermediate position between the turbine rotor blades 5 arranged in the circumferential direction, where (a) is an example and (b) is a comparative example. Each is shown. As shown in FIG. 5B, in the comparative example, a part of the combustion gas G flowing in the vicinity of the inner peripheral side end wall collides with the connection surface 28 'of the end wall 22', and a part of the combustion gas G2 is generated. It can be seen that the gas flows toward the upstream end face 27 along the connection surface 28 ′ having a circular arc cross section, and further flows deeply into the gap 23 ′ along the upstream end face 27 toward the inner peripheral side (C Part). In the gap 23 ', a vortex in which the sealing air S flowing from the inner peripheral side toward the outer peripheral combustion gas flow path F and the inflowing combustion gas G is mixed is formed (D portion). Become. For this reason, the inside of the gap 23 ′ becomes high temperature by the inflowing combustion gas G 2, and the cooling by the sealing air S expected together with the sealing function is not performed effectively by being supplied at a relatively low temperature. That is, the upstream end face 27 cannot be covered with the sealing air S, and the upstream end face 27 exposed to the high-temperature combustion gas G2 becomes high temperature.

  On the other hand, in the embodiment, the combustion gas G2 flowing toward the upstream end surface 27 along the connection surface 28 is separated at the separation portion 30 and does not flow along the upstream end surface 27 but flows toward the inner shroud 21. (Part A) For this reason, the combustion gas G2 flowing along the connection surface 28 does not flow into the gap 23, and the seal air S flowing into the combustion gas flow path F from the gap 23 on the combustion gas flow path F side with respect to the gap 23. After mixing, the combustion gas G flows again as a main flow through the combustion gas flow path F (B part). For this reason, the gap 23 is filled with the relatively low temperature sealing air S and is effectively cooled, and it is possible to prevent the combustion gas G from flowing in due to the circulation of the sealing air S and becoming high temperature. it can. Therefore, since the upstream end face 27 is covered with the seal air S, it can be prevented from becoming high temperature without being exposed to the combustion gas G2. In addition, since a thermal barrier coating that conventionally had to be applied up to the upstream end face 27 becomes unnecessary by applying the present invention, the manufacturing cost can be reduced without reducing the durability.

  FIGS. 6A and 6B are diagrams in which the end wall is viewed from the combustion gas flow path F side toward the inner peripheral side in a schematic radial direction. FIG. 6A is obtained by the CFD analysis for the example, and FIG. Shows the distribution of cooling efficiency. FIG. 7 shows the relationship between the relative position (circumferential pitch) with the turbine rotor blade in the circumferential direction in FIG. 6 and the cooling efficiency. The solid line P is for the example, and the broken line Q is for the comparative example. The cooling efficiency distribution on the line EE (refer FIG. 6) along the circumferential direction in 23 and 23 'is shown. In FIG. 7, 0% (100%) relative to the turbine blade 5 is a position where the circumferential position coincides with the leading edge 5a, and 50% is a position where the circumferential position is the turbine blade. It is a position that coincides with the middle position between the five. As shown by the broken line Q in FIG. 6B and FIG. 7, in the comparative example, the maximum value is shown at a position shifted to the back side by about 25% from the front edge 5a, and a certain degree of cooling efficiency is shown. As a result, the cooling efficiency is low, and the reduction in the cooling efficiency in the vicinity of the front edge 5a of the turbine rotor blade 5 is particularly remarkable. On the other hand, in the example, a value higher than the maximum value of the comparative example is shown at a position deviated from 10% to 50% from the front edge 5a, and high cooling efficiency is also shown in the vicinity of the front edge 5a. That is, in the embodiment, at any position in the circumferential direction, the combustion gas G2 is prevented from leaking into the gap 23 due to the separation effect of the combustion gas G2 by the separation portion 30, and thereby the seal air S is more efficient. It can be seen that cooling is taking place.

  As described above, according to the end wall 22 having the peeling portion 30 as in the present embodiment, the combustion gas G <b> 2 flowing along the connection surface 28 is peeled off by the peeling portion 30, thereby extending to the upstream end surface 27. In this way, it is possible to suppress the flow into the gap 23 between the adjacent inner shrouds 21. For this reason, it is possible to prevent the combustion gas G from reaching a high temperature by flowing into the gap 23 and to efficiently perform the cooling with the seal air S. Therefore, the flow rate of the seal air S is minimized. As described above, the compressed air generated by the compressor 2 can be used as the maximum combustion air, and the combustion gas G flowing mainly through the combustion gas flow path F can be further heated. Improvements can be made.

  In addition, as described above, the peeling part 30 forms a fold line in a cross-sectional view as the ridge line 28b between the connection surface 28 formed as the outer peripheral surface of the cone and the upstream end surface 27. The combustion gas G1 flowing along the ridge line 28b can be effectively peeled off, and can be prevented from flowing along the upstream end face 27 that is bent and extended from the ridge line 28b. The end wall 22, which is the end wall member 20, is configured as an end wall of the turbine rotor blade 5, and a part of the end wall surface 26 extends between the front edge 5 a of the turbine rotor blade 5 and the connection surface 28. By forming a straight surface in the plane including O, the flow that flows into the gap 23 from the front edge 5a of the turbine rotor blade 5 toward the connection surface 28 at the end wall surface 26 is effectively performed. Can be suppressed.

  In addition, in the end wall 22, as a connection surface which has a peeling part, it is not restricted to the said embodiment. 8 and 9 show a modification thereof. As shown in FIG. 8, in the end wall 40 of the first modified example, the ridge line portions 28 c and 28 d between the connection surface 28, the end wall surface 26, and the upstream end surface 27 are rounded. Here, the curvature radius R1 of the round process formed in the ridge line portions 28c and 28d is sufficiently small with respect to the height of the connection surface 28. For example, the height H28 of the connection surface 28 (see FIG. 4) is 4 mm, whereas the curvature radius R of the ridge line portions 28c and 28d is about 1 mm. Therefore, the combustion gas G2 flowing toward the upstream end face 27 along the connection surface 28 can be peeled off as the peeling portion 30 in the ridge line portion 28d as well, and the castability when casting the end wall 40 is also possible. Can be improved.

  Further, as shown in FIG. 9, in the end wall 41 of the second modification, the connection surface 42 that connects the end wall surface 26 and the upstream end surface 27 has a curvature radius on the upstream end surface 27 side in a cross-sectional view. R2 is the smallest, and is formed into an elliptical arc-shaped curved surface having the radius of curvature R2 on the end wall surface 26 side. Also in such a connection surface 42 of the end wall 41, the combustion portion 42 a connected to the upstream end surface 27 having a small curvature radius R <b> 2 flows as the separation portion 43 toward the upstream end surface 27 along the connection surface 42. The gas G2 can be peeled off.

Moreover, in the said embodiment and its modification, the peeling part 30 in the edge part of the combustion gas flow path F upstream of the end wall 22 which is one of the end wall members 20 which comprise the inner peripheral side end wall 11, Although the connection surface having 43 is described as being formed, the present invention is not limited to this. The same applies to the inner shroud 21 which is another end wall member 20 constituting the inner end wall 11, and also to the outer shroud 24 and the split ring 25 which are end wall members 20 constituting the outer end wall 10. It is the same. Each of the end wall members 20 includes an upstream end surface facing a member adjacent to the upstream side of the combustion gas flow path F, and a connection surface that connects the upstream end surface and the end wall surface. By providing a separation portion that separates the gas flowing toward the upstream end surface along the connection surface, the flow of the combustion gas along the connection surface is prevented from flowing into the clearance, and the seal that circulates the clearance Cooling can be effectively performed by air.
Further, in the above embodiment and its modified example, the peeling portion is provided at the boundary portion between the connection surface and the upstream end surface. However, the present invention is not limited to this, and is provided at an intermediate position of the connection surface. It may be provided.
Moreover, in the said embodiment and its modification, although the example which separated the combustion gas flow path F and the exterior in the turbine 7 of the gas turbine 1 was mentioned as an example as the end wall member 20, it is not restricted to this, A steam turbine It is possible to apply to an end wall member separated from the outside in a flow path such as a compressor.

1 Gas turbine 5 Turbine blade (robot)
5a Front edge 20 End wall member 21 Inner shroud (end wall member)
22, 40, 41 End wall (end wall member)
23 Clearance 24 Outer shroud (end wall member)
25 Split ring (end wall member)
26 End wall surface 27 Upstream end surface 28, 42 Connection surface 28b Ridge line 28d Ridge line part 30, 43 Separation part F Combustion gas flow path G, G1, G2 Combustion gas S Seal air

Claims (6)

An end wall member disposed along the flow path with a gap between adjacent members and separating the flow path from the outside,
An end wall facing the flow path;
An upstream end face facing a member adjacent to the upstream side of the flow path;
The upstream end surface and the end wall surface are connected, and a connection surface on which the fluid flowing as the main flow collides is provided,
The upstream side end surface is disposed on the downstream side of the flow path with respect to the adjacent member via the gap,
The connection surface is provided with a peeling portion for peeling the fluid flowing toward the upstream end surface along the connection surface after colliding with the connection surface,
It said connecting surface is formed so as to plane the passage plane formed along the end wall member, characterized in that it is inclined with respect to each of the upstream end surface and said end wall . The end wall member according to claim 1,
The end wall member, wherein the fluid peeled off by the peeling portion is mixed with sealing air flowing through the gap toward the flow path. The end wall member according to claim 1 or 2,
The end wall member is characterized in that a blade protrudes from an end wall surface of the end wall member and extends from the leading edge of the blade to the connection surface. In the end wall member according to any one of claims 1 to 3,
The flow path is a flow path through which a working fluid of the gas turbine flows.
An end wall member, wherein seal air can flow through the gap. The end wall member according to claim 4,
The end wall member, wherein the working fluid is a combustion gas.   A gas turbine comprising the end wall member according to any one of claims 1 to 5.