WO2018155640A1 - Axial-flow rotating machine, stator blade, and rotor blade - Google Patents

Abstract

An axial flow rotating machine (100) comprises a rotating shaft (1), a rotor blade (4), a casing (2), and a stator blade (7). A stator blade body (70A) comprises: a stator blade first shape part (73A) in which a stator blade intermediate part (76), which lies between a stator blade leading edge (74) and a stator blade trailing edge (75), is curved so as to be convex in the opposite direction from the rotating direction of the rotating shaft (1); and a stator blade second shape part (73B), which is formed on the outer side of the stator blade first shape part (73A) in a diametrical direction (Dr), and which has a stator blade inclined part (77A) that, relative to the stator blade leading edge (74) of the stator blade first shape part (73A), extends upstream in the opposite direction from the rotating direction of the rotating shaft (1).

Description

Axial-flow rotating machine, stationary blade, moving blade

The present invention relates to an axial-flow rotating machine, a stationary blade, and a moving blade.
This application claims priority on Japanese Patent Application No. 2017-033012 filed in Japan on February 24, 2017, the contents of which are incorporated herein by reference.

In an axial-flow rotating machine such as a steam turbine or a gas turbine, for example, as disclosed in Patent Document 1, a casing, a rotating shaft that is rotatably provided inside the casing, and an inner peripheral portion of the casing are fixedly disposed. And a moving blade provided radially on a rotating shaft on the downstream side of the stationary blade is known.
For example, in the case of a steam turbine, steam pressure energy is converted into velocity energy by a stationary blade, and this velocity energy is converted into rotational energy (mechanical energy) by a moving blade. In some cases, pressure energy is converted into velocity energy in the moving blade, and converted into rotational energy (mechanical energy) by reaction force from which steam is ejected.

In this type of rotary machine, a radial gap is formed between the tip of the rotor blade and a casing that surrounds the rotor blade and forms a steam flow path. A radial gap is also formed between the tip of the stationary blade and the rotating shaft. A working fluid such as steam may pass (leak) through these gaps.
The leakage flow of the working fluid that passes through the gap between the tip of the rotor blade and the casing flows radially inward from the gap between the tip of the rotor blade and the casing on the downstream side of the rotor blade. It joins the main flow of working fluid flowing in the direction. In addition, the leakage flow of the working fluid that passes through the gap between the tip of the stationary blade and the rotating shaft flows out radially outward from the gap between the tip of the stationary blade and the rotating shaft on the downstream side of the stationary blade. Join the mainstream of the fluid.

In this way, the leakage flow of the working fluid flowing out in the radial direction on the downstream side of the moving blade and the downstream side of the stationary blade joins the main flow of the working fluid flowing in the central axis direction in the casing so as to intersect. . When the main flow of the working fluid and the leakage flow of the working fluid intersect and merge, the main flow of the working fluid and the leakage flow of the working fluid collide and mix, and thus an energy loss called a mixing loss occurs. This increase in the mixing loss may hinder the improvement of the efficiency of the axial-flow rotating machine, and it is desired to reduce the mixing loss.

Japanese Patent Publication No. 2-3003

By the way, as disclosed in Patent Document 1, the moving blade and the stationary blade have a blade cross-sectional shape.
The moving blade has a leading edge on the upstream side in the main flow direction of the working fluid and an intermediate portion between the leading edge and the trailing edge with respect to the trailing edge on the downstream side in the flow direction. It has a blade cross-sectional shape that is recessed forward. A working fluid to which a swirl component around the rotation axis is applied to the moving blade through the upstream stationary blade to rotate the moving blade. For this reason, the front edge part of a moving blade is formed so that it may extend toward the direction along the flow of the working fluid swirled by the stationary blade.
However, the leakage flow of the working fluid that has passed through the gap between the radially inner tip portion of the stationary blade positioned upstream of the moving blade and the rotating shaft is not given a swirl component by the stationary blade. The direction of the leakage flow of the working fluid to which the swirl component is not applied is the direction of the leading edge of the moving blade formed in accordance with the direction along the flow of the working fluid swirled by the stationary blade as described above. Different. Therefore, when the leakage flow of the working fluid that has passed through the gap between the stationary blade located on the upstream side and the rotating shaft hits the leading edge of the moving blade at the radially inner end of the moving blade, mixing loss occurs.

Further, the stationary blade has a blade cross-sectional shape such that an intermediate portion between the front edge portion and the rear edge portion is recessed rearward in the rotation direction of the moving blade with respect to the front edge portion and the rear edge portion. . At the leading edge of the stationary blade, the flow of the working fluid that consumed the energy of the swirling component to rotate the moving blade through the moving blade on the upstream side, that is, the center of the rotating shaft hardly swiveled around the rotating shaft. The flow of the working fluid along the axial direction is hit. For this reason, the front edge part of a stationary blade is formed so that it may extend upstream along the center axis direction of a rotating shaft. However, the leakage flow of the working fluid that has passed through the gap between the radially outer tip of the moving blade located on the upstream side of the stationary blade and the casing is applied by the stationary blade on the upstream side of the moving blade. The energy of the swirl component for rotating the wing is not consumed, and the swirl is about the rotation axis. For this reason, since the direction of the leakage flow of the working fluid that has passed through the gap between the tip of the rotor blade and the casing is different from the direction of the leading edge of the stationary blade that faces the upstream side in the central axis direction, mixing loss occurs. .

The present invention has been made in view of the above circumstances, and reduces the mixing loss between the main flow of the working fluid and the leakage flow of the working fluid, and increases the efficiency of the axial flow rotating machine. The purpose is to provide wings and blades.

The present invention employs the following means in order to solve the above problems.
In a first aspect of the present invention, a rotating shaft that rotates about a central axis, a platform provided radially outward of the rotating shaft, and a moving blade provided to extend radially outward from the platform A moving blade having a main body, and a cylindrical casing that is disposed radially outside the rotating shaft and the moving blade, and in which the working fluid flows from the upstream side toward the downstream side along the central axis direction And a stationary blade main body provided to extend radially inward from the casing, and a stationary blade having a stationary blade shroud provided radially inward of the stationary blade body. The stationary blade body is located between the stationary blade leading edge and the stationary blade trailing edge with respect to the upstream stationary blade leading edge and the downstream stationary blade trailing edge in the stationary blade body. A stationary vane intermediate portion is formed so as to be convex in a direction opposite to the rotation direction of the rotating shaft, and is formed on the radially outer side with respect to the stationary blade first shape portion, A stationary blade second shape portion having a stationary blade inclined portion extending toward the upstream side in the direction opposite to the rotation direction of the rotating shaft with respect to the stationary blade leading edge portion of the stationary blade first shape portion; Is provided.

According to such a configuration, the stationary blade first shape portion of the stationary blade body allows the main flow of the working fluid flowing from the upstream side to flow from the stationary blade leading edge portion to the stationary blade trailing edge portion via the stationary blade intermediate portion. The swirl flow for rotating the rotor blade on the wake side is generated.
The stationary blade second shape portion of the stationary blade body has a stationary blade inclined portion extending toward the upstream side of the stationary blade leading edge portion of the stationary blade first shape portion in the direction opposite to the rotation direction of the rotating shaft. Yes. For this reason, the inlet angle of the stationary blade can be made to follow the direction of the leakage flow of the working fluid having the energy of the swirling component through the gap between the moving blade and the casing located on the upstream side of the stationary blade. . Thereby, it is possible to suppress a loss that occurs when the leakage flow of the working fluid hits the stationary blade.

According to a second aspect of the present invention, in the first aspect, the stationary blade inclined portion is configured such that the rotating shaft of the rotating shaft with respect to the stationary blade leading edge portion is directed radially outward from the stationary blade first shape portion. The amount of displacement in the direction opposite to the rotational direction may be formed so as to gradually increase.

According to such a configuration, the stationary blade inclined portion can be made to follow the direction of the leakage flow of the working fluid, as the flow rate of the leakage flow of the working fluid is larger in the radial direction. Further, the displacement of the stationary blade inclined portion is decreased toward the radially inner side where the flow rate of the leakage flow of the working fluid gradually decreases, and the stationary blade inclined portion is moved to the stationary blade leading edge portion of the stationary blade first shape portion. Can be continuous.

In the third aspect of the present invention, in the first or second aspect, the stationary blade inclined portion may be formed in a connection portion with the casing in the stationary blade body.

According to such a configuration, the stationary blade inclined portion is formed in the connection portion with the casing on the radially outer side in the stationary blade body where the influence of the leakage flow of the working fluid is maximized. Thereby, the loss when the leakage flow of the working fluid collides with the stationary blade can be effectively suppressed.

According to a fourth aspect of the present invention, in the first to third aspects, the casing is recessed radially outward of the moving blade main body located upstream of the stationary blade. A moving blade cavity may be formed, and at least a part of the stationary blade inclined portion may be provided to face the moving blade cavity in the central axis direction.

With this configuration, the leakage flow of the working fluid passing through the gap between the blade cavity and the radially outer tip of the blade body flows in the direction along the central axis direction, and the stationary blade inclined portion It can be accepted as it is. Thereby, the loss when the leakage flow of the working fluid collides with the stationary blade can be effectively suppressed.

According to a fifth aspect of the present invention, in the first to fourth aspects, the moving blade main body includes the upstream moving blade leading edge portion of the moving blade main body and the downstream moving blade rear. The blade first shape portion curved so that a blade intermediate portion between the blade front edge and the blade trailing edge is convex in the rotation direction of the rotating shaft with respect to the edge, and The blade is formed radially inward with respect to the blade first shape portion, and extends toward the upstream side of the rotating shaft toward the upstream side of the blade front edge of the blade first shape portion. A moving blade inclined portion having a moving blade inclined portion.

According to such a configuration, the swirl flow generated by the upstream stationary vane flows as the main flow of the working fluid in the moving blade first shape portion of the moving blade body. The swirling flow hits the first shape portion of the moving blade and flows along the moving blade rear edge portion from the moving blade leading edge portion through the moving blade intermediate portion, so that the moving blade and the rotating shaft swirl around the central axis. .
Since the moving blade inclined portion of the moving blade second shape portion of the moving blade body extends toward the upstream side of the rotating blade front edge portion of the moving blade first shape portion, The inlet angle of the moving blade can be made to follow the direction of the leakage flow of the working fluid that does not have the energy of the swirling component through the gap between the stationary blade and the casing located on the upstream side of the moving blade. Thereby, it is possible to suppress a loss that occurs when the leakage flow of the working fluid hits the moving blade.

According to a sixth aspect of the present invention, in the fifth aspect, the rotating blade inclined portion rotates with respect to the moving blade leading edge as it moves radially inward from the moving blade first shape portion. It may be formed so that the amount of displacement of the shaft in the rotational direction side gradually increases.

According to such a configuration, the moving blade inclined portion is made to follow the direction of the leakage flow of the working fluid as the flow rate of the leakage flow of the working fluid between the stationary blade and the rotating shaft is larger in the radial direction. Can do. Further, the displacement of the blade inclined portion is decreased toward the radially outer side where the flow rate of the leakage flow of the working fluid gradually decreases, and the blade inclined portion is moved to the blade leading edge portion of the blade first shape portion. Can be continuous.

According to the seventh aspect of the present invention, in the fifth or sixth aspect, the moving blade inclined portion may be formed in the connecting portion with the rotating shaft in the moving blade body.

According to such a configuration, the blade inclined portion is formed at the connecting portion with the rotary shaft on the radially inner side in the blade main body, where the influence of the leakage flow of the working fluid is maximized. Thereby, the loss when the leakage flow of the working fluid and the moving blade collide can be effectively suppressed.

According to an eighth aspect of the present invention, in the fifth to seventh aspects, the rotary shaft includes a radially inner side radially inward of the stationary blade body positioned upstream of the moving blade. A stationary blade cavity that is recessed may be formed, and at least a part of the blade inclined portion may be provided to face the stationary blade cavity in the central axis direction.

By configuring in this way, the leakage flow of the working fluid that passes through the gap between the stationary blade cavity and the radially inner tip of the stationary blade body flows in the direction along the central axis direction, It can be accepted as it is. Thereby, the loss when the leakage flow of the working fluid and the moving blade collide can be effectively suppressed.

According to the ninth aspect of the present invention, the rotating shaft that rotates around the central axis, the platform provided on the radially outer side of the rotating shaft, and the movement provided to extend radially outward from the platform. A moving blade having a blade body, and a cylindrical shape that is disposed on the outer side in the radial direction of the rotating shaft and the moving blade, and in which the working fluid flows from the upstream side to the downstream side along the central axis direction A casing, a stationary blade body provided so as to extend radially inward from the casing, and a stationary blade having a stationary blade shroud provided radially inward of the stationary blade body. The blade main body is located between the blade front edge and the blade trailing edge with respect to the upstream blade front edge and the downstream blade trailing edge of the blade body. A moving blade intermediate portion is formed so as to be convex in the rotation direction of the rotating shaft, and is formed on the radially inner side with respect to the moving blade first shape portion. A moving blade second shape portion having a moving blade inclined portion extending toward the upstream side in the rotation direction of the rotating shaft with respect to the moving blade leading edge portion of the one shape portion.

According to such a configuration, the swirl flow generated by the upstream stationary vane flows as the main flow of the working fluid in the moving blade first shape portion of the moving blade body. The swirling flow hits the first shape portion of the moving blade and flows along the moving blade rear edge portion from the moving blade leading edge portion through the moving blade intermediate portion, so that the moving blade and the rotating shaft swirl around the central axis. .
Since the moving blade inclined portion of the moving blade second shape portion of the moving blade body extends toward the upstream side of the rotating blade front edge portion of the moving blade first shape portion, It is possible to follow the direction of the leakage flow of the working fluid that does not have the energy of the swirling component through the gap between the stationary blade and the casing located on the upstream side of the moving blade. Thereby, it is possible to suppress a loss that occurs when the leakage flow of the working fluid hits the moving blade.

According to a tenth aspect of the present invention, there is provided a stationary blade body provided to extend radially inward from the casing of the axial-flow rotating machine in which the rotation shaft is provided to be rotatable around the central axis in the casing. The stationary blade main body has a first blade edge on the first side in the central axis direction and a second blade edge on the second side in the central axis direction of the stationary blade body. A stationary vane first shape portion curved so that a stationary blade intermediate portion between the first edge portion and the stationary blade second edge portion protrudes in a direction opposite to the rotation direction of the rotating shaft; It is formed on the outer side in the radial direction with respect to one shape portion, and on the opposite side to the rotation direction of the rotary shaft toward the first side with respect to the first blade portion of the stator blade first shape portion. A stationary blade second shape portion having an extending stationary blade inclined portion.

According to such a configuration, the stationary blade first shape portion of the stationary blade body causes the main flow of the working fluid flowing from the upstream side to flow from the stationary blade first edge to the stationary blade second through the stationary blade intermediate portion. A swirling flow for rotating the rotor blade on the wake side is generated by being along the edge.
The stationary blade second shape portion of the stationary blade main body has a stationary blade inclined portion that extends toward the upstream side in the direction opposite to the rotation direction of the rotation shaft with respect to the stationary blade first edge portion of the stationary blade first shape portion. Therefore, it is possible to make the inlet angle of the stationary blade follow the direction of the leakage flow of the working fluid having the energy of the swirling component through the gap between the moving blade and the casing located on the upstream side of the stationary blade. it can. Thereby, it is possible to suppress a loss that occurs when the leakage flow of the working fluid hits the stationary blade.

According to the eleventh aspect of the present invention, there is provided the rotor blade body provided in the casing so as to extend radially outward from the rotation shaft of the axial-flow rotating machine in which the rotation shaft is rotatably provided around the central axis. . The rotor blade main body has a first blade edge on the first side in the central axis direction of the rotor blade body and a second blade edge on the second side in the central axis direction. A moving blade first shape portion curved so that a moving blade intermediate portion between one edge portion and the moving blade second edge portion is convex in the rotation direction of the rotating shaft, and the moving blade first shape portion The blade inclined portion that is formed on the radially inner side and extends toward the first side toward the rotation direction of the rotating shaft with respect to the blade first edge of the blade first shape portion. And a moving blade second shape portion.

According to such a configuration, the swirl flow generated by the upstream stationary vane flows as the main flow of the working fluid in the moving blade first shape portion of the moving blade body. This swirling flow hits the first shape part of the moving blade and flows along the second edge of the moving blade from the first edge of the moving blade through the intermediate portion of the moving blade. Turn.
Since the moving blade inclined portion of the moving blade second shape portion of the moving blade body extends toward the upstream side of the rotating shaft with respect to the moving blade first edge portion of the moving blade first shape portion. The inlet angle of the moving blade can be made to follow the direction of the leakage flow of the working fluid that does not have the energy of the swirling component through the gap between the stationary blade and the casing located on the upstream side of the moving blade. Thereby, it is possible to suppress a loss that occurs when the leakage flow of the working fluid hits the moving blade.

According to the axial flow rotating machine, the stationary blade, and the moving blade according to the present invention, the mixing loss between the main flow of the working fluid and the leakage flow of the working fluid can be reduced, and the efficiency of the axial flow rotating machine can be increased.

It is a mimetic diagram showing the composition of the steam turbine concerning the embodiment of the present invention. It is a principal part enlarged view of the steam turbine which concerns on 1st embodiment of this invention. It is a perspective view which shows the shape of the stationary blade main body of the said steam turbine. It is the figure which looked at the said stationary blade main body from the radial direction outer side. It is a perspective view which shows the shape of the moving blade main body of the said steam turbine. It is the figure which looked at the said moving-blade main body from the radial direction outer side. It is a principal part enlarged view of the steam turbine which concerns on 2nd embodiment of this invention.

Hereinafter, an axial flow rotating machine, a stationary blade, and a moving blade according to an embodiment of the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 1 is a schematic diagram showing a configuration of a steam turbine according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the steam turbine according to the first embodiment of the present invention.
As shown in FIG. 1, a steam turbine (axial flow rotary machine) 100 according to this embodiment includes a rotating shaft 1, a casing 2, a moving blade stage 3 including a plurality of moving blades 4, and a plurality of stationary blades 7. And a stationary blade stage 6 provided with.

The rotary shaft 1 has a cylindrical shape extending along the central axis Ac. The rotary shaft 1 is supported at both ends in the central axis direction Da along the central axis Ac by the bearing device 5 so as to be rotatable around the central axis Ac. The bearing device 5 includes a journal bearing 5A provided on each side of the central axis direction Da of the rotating shaft 1 and a thrust bearing 5B provided only on the first side in the central axis direction Da. The journal bearing 5 </ b> A supports a load in the radial direction Dr by the rotating shaft 1. The thrust bearing 5B supports the load in the central axis direction Da by the rotating shaft 1.

The casing 2 has a cylindrical shape extending in the central axis direction Da. The casing 2 covers the rotating shaft 1 from the outer peripheral side.
The casing 2 includes an intake port 10 and an exhaust port 11. The air inlet 10 is formed on the first side in the central axis direction Da of the casing 2 and takes in steam (working fluid) into the casing 2 from the outside. The exhaust port 11 is formed on the second side of the casing 2 in the central axis direction Da and exhausts the steam that has passed through the casing 2 to the outside.
In the following description, the side where the intake port 10 is located when viewed from the exhaust port 11 is referred to as the upstream side, and the side where the exhaust port 11 is located when viewed from the intake port 10 is referred to as the downstream side.

The rotor blade stage 3 is provided with a plurality of stages on the outer peripheral surface 1S of the rotating shaft 1 at intervals from the first side to the second side in the central axis direction Da. Each blade stage 3 has a plurality of blades 4 arranged on the outer peripheral surface 1S of the rotary shaft 1 at intervals in the circumferential direction around the central axis Ac.

As shown in FIG. 2, the moving blade 4 includes a platform 43 provided on the outer peripheral surface 1 </ b> S of the rotating shaft 1, a moving blade body 40 </ b> A, and a moving blade shroud 41.

The rotor blade main body 40A is formed to extend from the platform 43 toward the outside in the radial direction Dr. The rotor blade main body 40A has an airfoil-shaped cross section when viewed from the radial direction Dr.

The rotor blade shroud 41 is provided at the outer end of the rotor blade main body 40A in the radial direction Dr. The moving blade shroud 41 is set such that the dimension in the central axis direction Da is larger than the dimension of the moving blade body 40A in the central axis direction Da.

A moving blade cavity 20 for accommodating the moving blade shroud 41 is formed in an area on the inner peripheral side of the casing 2 and facing the moving blade shroud 41 in the radial direction Dr. The rotor blade cavity 20 is recessed from the inner peripheral surface 2S of the casing 2 toward the outer side in the radial direction Dr, and has a groove shape continuous in the circumferential direction around the central axis Ac.

The blade cavity 20 is provided with a plurality (two) of blade-side fins 42. These blade-side fins 42 have a thin plate shape extending inward in the radial direction Dr. The tip of the rotor blade side fin 42 and the rotor blade cavity 20 face each other with a predetermined gap (clearance) in the radial direction Dr.

As shown in FIG. 1, the stationary blade stage 6 is provided with a plurality of stages on the inner peripheral surface of the casing 2 at intervals along the central axis direction Da. Each stationary blade stage 6 is arranged on the upstream side of each moving blade stage 3. Each stationary blade stage 6 has a plurality of stationary blades 7 arranged at intervals in the circumferential direction around the central axis Ac.

As shown in FIG. 2, the stationary blade 7 includes a stationary blade body 70 </ b> A and a stationary blade shroud 71.
The stationary blade body 70A is provided so as to extend from the inner peripheral surface 2S of the casing 2 toward the inside in the radial direction Dr. The stationary blade body 70A has a blade-shaped cross section when viewed from the radial direction Dr.
The stationary blade shroud 71 is attached to an end portion on the inner side in the radial direction Dr of the stationary blade body 70A.

In this embodiment, the radial direction Dr dimensions of the stationary blade body 70A and the moving blade body 40A are the same. In other words, when viewed from the central axis direction Da, the stationary blade body 70A and the moving blade body 40A are arranged so as to overlap each other.

On the outer peripheral surface 1S facing the outer side of the radial direction Dr of the rotary shaft 1, on the upstream side of each rotor blade stage 3, the outer peripheral surface 1S of the rotary shaft 1 is recessed from the outer peripheral surface 1S toward the inner side in the radial direction Dr. A groove-shaped stationary blade cavity 8 continuous in the direction is formed. The stationary blade shroud 71 of each stationary blade 7 is accommodated in the stationary blade cavity 8.

The stationary blade shroud 71 is provided with a plurality (two) of stationary blade side fins 72. Each of the stationary blade side fins 72 has a thin plate shape that extends from the stationary blade shroud 71 toward the inside in the radial direction Dr. The stationary blade side fin 72 and the stationary blade cavity 8 are opposed to each other with a predetermined gap in the radial direction Dr.

The operation of the steam turbine 100 configured as described above will be described with reference to FIG. In operating the steam turbine 100, first, high-temperature and high-pressure steam supplied from a steam supply source (not shown) such as a boiler is introduced into the casing 2 through the intake port 10. The steam introduced into the casing 2 sequentially collides with the moving blade 4 (the moving blade stage 3) and the stationary blade 7 (the stationary blade stage 6). In each stationary blade stage 6, the steam flowing from the upstream side hits the stationary blade 7, so that a swirl component around the rotating shaft 1 is added to this steam flow. As a result, on the downstream side of each stationary blade stage 6, the steam flow swirls around the rotary shaft 1. Each moving blade stage 3 reaches the flow of steam swirling around the rotary shaft 1 through the upstream stationary blade stage 6. When the swirling steam flow hits each rotor blade 4, the rotating shaft 1 obtains rotational energy and rotates around the central axis Ac. The rotational movement of the rotary shaft 1 is taken out by a generator or the like (not shown) connected to the shaft end.
The above cycle is repeated continuously.

As described above, the steam flows alternately from the upstream side to the downstream side through the stationary blades 7 and the moving blades 4, thereby forming the mainstream FM. The mainstream FM is rectified by sequentially colliding with the stationary blade 7 and the moving blade 4 as described above, and gives energy to the moving blade 4.

On the other hand, in each stationary blade stage 6, components other than the main flow FM out of the steam flowing from the upstream side flow into the stationary blade cavity 8 and are disposed on the stationary blade shroud 71. And a stationary blade leakage flow FLs passing through a gap between the rotating blade 1 and the stationary blade cavity 8 formed on the rotating shaft 1 is formed. When the stationary blade leakage flow FLs reaches the downstream side of the stationary blade shroud 71, the stationary blade leakage flow FLs flows between the stationary blade shroud 71 and the platform 43 from the inner side in the radial direction Dr toward the outer side on the downstream side of the stationary blade shroud 71. , Join the mainstream FM.

In each blade stage 3, the components other than the mainstream FM out of the steam flowing from the upstream side flow into the blade cavity 20, and the moving blades provided in the blade shroud 41 and the blade cavity 20. A blade leakage flow FLm is formed that passes through the gap with the blade-side fin 42. When the moving blade leakage flow FLm reaches the downstream side of the moving blade shroud 41, it flows between the moving blade shroud 41 and the moving blade cavity 20 from the outer side in the radial direction Dr to the inner side, and joins the main flow FM.

In the present embodiment, in the steam turbine 100 configured as described above, the stationary blade body 70A and the moving blade body 40A have the following configurations.

FIG. 3 is a perspective view showing the shape of the stationary blade body of the steam turbine. FIG. 4 is a view of the stationary blade body as viewed from the outside in the radial direction.
As shown in FIGS. 3 and 4, the stationary blade body 70 </ b> A has a stationary blade first shape portion 73 </ b> A and a stationary blade second shape portion 73 </ b> B.

The stationary blade first shape portion 73A is formed in the stationary blade body 70A from the stationary blade shroud 71 inside the radial direction Dr over a predetermined length along the radial direction Dr. The stationary blade first shape portion 73A includes a stationary blade leading edge portion (static blade first edge portion) 74 positioned on the upstream side in the stationary blade body 70A and a stationary blade trailing edge portion (static blade second edge) positioned on the downstream side. The blade is curved so that the stationary blade intermediate portion 76 between the stationary blade leading edge portion 74 and the stationary blade trailing edge portion 75 is convex in the direction opposite to the rotation direction R of the rotary shaft 1 with respect to the edge) 75. It has a cross-sectional shape.

The stationary blade second shape portion 73B is formed outside the radial direction Dr with respect to the stationary blade first shape portion 73A. The stationary blade second shape portion 73B has a stationary blade inclined portion 77A on the upstream side. The stationary blade inclined portion 77A is formed to extend toward the upstream side in the direction Rz opposite to the rotational direction R of the rotating shaft 1 with respect to the stationary blade leading edge portion 74 of the stationary blade first shape portion 73A. . Further, the stationary blade inclined portion 77A has a displacement amount in the direction Rz opposite to the rotational direction R of the rotary shaft 1 with respect to the stationary blade leading edge portion 74 as it goes outward from the stationary blade first shape portion 73A in the radial direction Dr. It is formed to gradually increase. In this way, the stationary blade inclined portion 77A is formed at the connection portion with the casing 2 in the stationary blade body 70A.
The downstream side of the stationary blade second shape portion 73B other than the stationary blade inclined portion 77A has the same shape as the stationary blade first shape portion 73A.

Here, the inclination direction Dk of the stationary blade inclined portion 77A passes through the gap between the moving blade 4 located on the upstream side of the stationary blade 7 and the moving blade cavity 20 of the casing 2, and has the energy of the swirling component. It is preferable to follow the direction of the steam leakage flow FLm. The inclination direction Dk of the stationary blade inclined portion 77A is preferably set at an angle of, for example, about 5 to 45 degrees with respect to the central axis direction Da.
In addition, the stationary blade inclined portion 77A is preferably formed in the stationary blade body 70A so as to be within a range of, for example, 10 to 30% with respect to the blade height Ht along the radial direction Dr.

FIG. 5 is a perspective view showing the shape of the rotor blade main body of the steam turbine. FIG. 6 is a view of the moving blade main body as viewed from the outside in the radial direction.
As shown in FIGS. 5 and 6, the rotor blade main body 40A includes a rotor blade first shape portion 44A and a rotor blade second shape portion 44B.

The moving blade first shape portion 44A includes a moving blade leading edge portion (moving blade first edge portion) 45 located on the upstream side of the moving blade main body 40A and a moving blade trailing edge portion (moving blade second blade) located on the downstream side. The blade cross-sectional shape is curved so that the blade intermediate portion 47 between the blade leading edge 45 and the blade trailing edge 46 is convex in the rotation direction R of the rotating shaft 1 with respect to the edge 46). have.

The moving blade second shape portion 44B is formed on the inner side in the radial direction Dr with respect to the moving blade first shape portion 44A. The moving blade second shape portion 44B has a moving blade inclined portion 48A on the upstream side. The moving blade inclined portion 48A is formed so as to extend toward the rotation direction R of the rotating shaft 1 toward the upstream side with respect to the moving blade leading edge 45 of the moving blade first shape portion 44A. Further, the moving blade inclined portion 48A gradually increases in the amount of displacement of the rotating shaft 1 in the rotational direction R side with respect to the moving blade leading edge 45 toward the inner side in the radial direction Dr from the moving blade first shape portion 44A. Is formed. In this way, the moving blade inclined portion 48A is formed in the connecting portion with the rotating shaft 1 in the moving blade main body 40A.
The portion other than the moving blade inclined portion 48A on the downstream side of the moving blade second shape portion 44B has the same shape as the moving blade first shape portion 44A.

Here, the inclination direction Dm of the moving blade inclined portion 48A passes through the gap between the stationary blade 7 located on the upstream side of the moving blade 4 and the stationary blade cavity 8 of the rotating shaft 1, and has the energy of the swirl component. It is preferable to follow the direction of no steam leakage flow FLs. The inclination direction Dm of the moving blade inclined portion 48A is preferably about 5 to 45 degrees, for example, with respect to the central axis direction Da.
Further, the moving blade inclined portion 48A is preferably formed so as to fall within a range of, for example, 10 to 30% with respect to the blade height Hu along the radial direction Dr in the moving blade body 40A.

According to the configuration as described above, as shown in FIGS. 3 and 4, the stationary blade first shape portion 73 </ b> A of the stationary blade body 70 </ b> A converts the main flow FM of the steam flowing from the upstream side into the stationary blade leading edge portion. A swirling flow for rotating the moving blade 4 on the wake side is generated by moving along the stationary blade trailing edge 75 from 74 through the stationary blade intermediate portion 76.
In the stationary blade second shape portion 73B of the stationary blade body 70A, the stationary blade inclined portion 77A has a rotational direction R of the rotating shaft 1 toward the upstream side with respect to the stationary blade leading edge portion 74 of the stationary blade first shape portion 73A. Since it extends in the opposite direction Rz, it passes through the gap between the moving blade 4 located on the upstream side of the stationary blade 7 and the casing 2 and follows the direction of the steam leakage flow FLm having the energy of the swirling component. Can be made. Thereby, in the stationary blade second shape portion 73B, on the downstream side of the stationary blade inclined portion 77A, the steam leakage flow FLm flowing along the stationary blade inclined portion 77A flows in the same direction as the main flow FM of steam. Become.

Further, the swirl flow generated by the upstream stationary blade 7 flows as the main flow FM of the steam into the first blade-shaped portion 44A of the blade main body 40A. The swirling flow hits the first blade shaped portion 44A and flows from the blade leading edge 45 through the blade intermediate portion 47 along the blade trailing edge 46, whereby the blade 4 and the rotary shaft 1 are moved. It turns around the central axis Ac.
Further, in the moving blade second shape portion 44B of the moving blade main body 40A, the moving blade inclined portion 48A rotates the rotary shaft 1 toward the upstream side with respect to the moving blade leading edge portion 45 of the moving blade first shape portion 44A. It extends in the direction R side. Thus, the direction of the inclined portion 48A of the moving blade passes through the gap between the stationary blade 7 and the casing 2 located on the upstream side of the moving blade 4, and the direction of the leakage flow FLs of the steam having no swirling component energy Can be along. Thereby, in the moving blade second shape portion 44B, the steam leakage flow FLs flowing along the moving blade inclined portion 48A flows in the same direction as the main flow FM of steam on the downstream side of the moving blade inclined portion 48A. Become.

According to the steam turbine 100 and the stationary blade 7 as described above, the steam leakage flow FLm having the energy of the swirl component can be made to follow the stationary blade inclined portion 77A. Thereby, it is possible to suppress a loss that occurs when the steam leakage flow FLm hits the stationary blade 7. Therefore, the steam leakage flow FLm can be satisfactorily merged with the main steam FM along the stationary blade 7, the mixing loss with the steam leakage flow FLm can be reduced, and the efficiency of the steam turbine 100 can be improved. it can.

Further, as the stationary blade inclined portion 77A moves from the stationary blade first shape portion 73A toward the outside in the radial direction Dr, the displacement amount of the rotating blade 1 in the direction Rz opposite to the rotational direction R of the stationary blade leading edge 74 gradually increases. It is getting bigger. As a result, the stationary blade inclined portion 77A can be made to follow the direction of the steam leakage flow FLm as the flow rate of the steam leakage flow FLm increases toward the outside of the radial direction Dr. Further, the amount of displacement of the stationary blade inclined portion 77A is decreased toward the inner side of the radial direction Dr where the flow rate of the steam leakage flow FLm gradually decreases, and the stationary blade inclined portion 77A is replaced with the stationary blade first shape portion 73A. The wing leading edge 74 can be continued. This makes it possible to more efficiently suppress the loss that occurs when the steam leakage flow FLm hits the stationary blade 7.

Further, the stationary blade inclined portion 77A is formed at a connection portion with the casing 2 in the stationary blade body 70A. Thereby, the stationary blade inclined portion 77A is formed at the connection portion with the casing 2 outside the radial direction Dr in the stationary blade body 70A, where the influence of the steam leakage flow FLm is maximized. Thereby, the loss when the steam leakage flow FLm and the stationary blade 7 collide can be effectively suppressed.

Further, according to the steam turbine 100 and the moving blade 4 as described above, the leakage of the steam that does not have the energy of the swirling component through the gap between the stationary blade 7 and the casing 2 located on the upstream side of the moving blade 4. The flow FLs can be made to follow the blade inclined portion 48A. As a result, it is possible to suppress the loss that occurs when the steam leakage flow FLs hits the rotor blade 4. Therefore, the steam leakage flow FLs can be satisfactorily merged with the main steam FM along the moving blade 4, the mixing loss with the steam leakage flow FLs can be reduced, and the efficiency of the steam turbine 100 can be improved. it can.

Further, the moving blade inclined portion 48A gradually increases in the amount of displacement of the rotating shaft 1 in the rotation direction R side with respect to the moving blade leading edge 45 toward the inner side in the radial direction Dr from the moving blade first shape portion 44A. Is formed. As a result, the moving blade inclined portion 48A can be made to follow the direction of the steam leakage flow FLs as the flow rate of the steam leakage flow FLs between the stationary blade 7 and the rotary shaft 1 is larger in the radial direction Dr. it can. Further, the displacement amount of the moving blade inclined portion 48A is decreased toward the outside of the radial direction Dr where the flow rate of the steam leakage flow FLs gradually decreases, and the moving blade inclined portion 48A is moved to the dynamic state of the moving blade first shape portion 44A. The wing leading edge 45 can be continued. As a result, the loss that occurs when the steam leakage flow FLs hits the rotor blade 4 can be more efficiently suppressed.

Further, the moving blade inclined portion 48A is formed at the connecting portion with the rotating shaft 1 in the moving blade main body 40A. As a result, the blade inclined portion 48A is formed at the connecting portion with the rotary shaft 1 inside the radial direction Dr in the blade main body 40A, where the influence of the steam leakage flow FLs is maximized. Thereby, the loss when the steam leakage flow FLs and the moving blade 4 collide can be effectively suppressed.

[Second Embodiment]
Next, a second embodiment of the axial-flow rotating machine, the stationary blade, and the moving blade according to the present invention will be described. In the second embodiment described below, since only the configuration of the stationary blade body 70A and the moving blade body 40A is different from that of the first embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals and described. The duplicated explanation is omitted.

FIG. 7 is an enlarged view of a main part of the steam turbine according to the second embodiment of the present invention.
As shown in FIG. 7, in the present embodiment, in the steam turbine 100 having the same configuration as that shown in the first embodiment, the stationary blade body 70C and the moving blade body 40C have the following configurations. .

The stationary blade body 70C includes a stationary blade first shape portion 73A and a stationary blade second shape portion 73C.

The stationary blade first shape portion 73A is formed in the stationary blade body 70C from the stationary blade shroud 71 inside the radial direction Dr over a predetermined length along the radial direction Dr. The stationary blade first shape portion 73A is opposed to the stationary blade leading edge portion 74 and the stationary blade leading edge portion 74 located on the upstream side of the stationary blade body 70C and the stationary blade trailing edge portion 75 located on the downstream side. The stationary blade intermediate portion 76 between the blade trailing edge portions 75 has a blade cross-sectional shape curved so as to protrude in the direction opposite to the rotation direction R of the rotating shaft 1.

The stationary blade second shape portion 73C is formed outside the radial direction Dr with respect to the stationary blade first shape portion 73A. The stationary blade second shape portion 73C has a stationary blade inclined portion 77C on the upstream side. As shown in FIG. 4, the stationary blade inclined portion 77C faces the upstream side with respect to the stationary blade leading edge portion 74 of the stationary blade first shape portion 73A, like the stationary blade inclined portion 77A of the first embodiment. Thus, it is formed to extend in the direction Rz opposite to the rotation direction R of the rotation shaft 1. Further, in the stationary blade inclined portion 77C, the amount of displacement in the direction Rz opposite to the rotational direction R of the rotating shaft 1 relative to the stationary blade leading edge 74 gradually increases from the stationary blade first shape portion 73A toward the outside in the radial direction Dr. It is formed to be large.

In this embodiment, the stationary blade inclined portion 77C is provided such that a part of the end portion 77s inside the radial direction Dr faces the moving blade cavity 20 in the central axis direction Da. For this reason, the inner peripheral surface 2S of the casing 2 is formed with a recess 27 that is inclined outward in the radial direction Dr toward the upstream side. The end 77s of the stationary blade inclined portion 77C on the outer side in the radial direction Dr gradually protrudes outward in the radial direction Dr along the concave portion 27 toward the upstream side. In this way, the stationary blade inclined portion 77C is formed at the connection portion with the casing 2 in the stationary blade body 70C.

Here, the inclination direction Dk of the stationary blade inclined portion 77C passes through the gap between the moving blade 4 located on the upstream side of the stationary blade 7 and the moving blade cavity 20 of the casing 2, and has the energy of the swirling component. It is preferable to follow the direction of the steam leakage flow FLm. The inclination direction of the stationary blade inclined portion 77C is preferably set at an angle of, for example, about 10 to 30 degrees with respect to the central axis direction Da. Further, the end 77s of the stationary blade inclined portion 77C on the outer side in the radial direction Dr, that is, the portion protruding outward in the radial direction Dr is 20 chord length of the stationary blade body 70C from the front edge end of the stationary blade body 70C. It may be formed in a range of ˜40%. At portions other than the end 77s of the stationary blade inclined portion 77C, the outer end face in the radial direction Dr is along the central axis Ac.

The moving blade main body 40C includes a moving blade first shape portion 44A and a moving blade second shape portion 44C.
The moving blade first shape portion 44A has a moving blade leading edge 45 and a moving blade leading edge 45 located on the upstream side of the moving blade body 40C and a moving blade trailing edge 46 located on the downstream side. The blade intermediate portion 47 between the blade trailing edge portions 46 has a blade cross-sectional shape that is curved so as to be convex in the rotation direction R of the rotating shaft 1.

The moving blade second shape portion 44C is formed on the inner side in the radial direction Dr with respect to the moving blade first shape portion 44A. The moving blade second shape portion 44C has a moving blade inclined portion 48C on the upstream side. The moving blade inclined portion 48C rotates toward the upstream side with respect to the moving blade leading edge 45 of the moving blade first shape portion 44A, similarly to the moving blade inclined portion 48A of the first embodiment shown in FIG. It is formed so as to extend toward the rotation direction R side of the shaft 1. Further, in the moving blade inclined portion 48C, the amount of displacement of the rotating shaft 1 in the rotation direction R side with respect to the moving blade leading edge 45 gradually increases from the moving blade first shape portion 44A toward the inside in the radial direction Dr. Is formed.

In this embodiment, the blade inclined portion 48C is provided such that a part of the end 48s outside the radial direction Dr faces the stationary blade cavity 8 in the central axis direction Da. For this reason, the outer peripheral surface of the rotating shaft 1 is formed with a recess 87 that is inclined inward in the radial direction Dr toward the upstream side. The end 48s on the inner side in the radial direction Dr of the blade inclined portion 48C gradually protrudes inward in the radial direction Dr toward the upstream side along the recess 87. Thus, the moving blade inclined portion 48C is formed at the connecting portion with the rotating shaft 1 in the moving blade main body 40C.

Here, the inclination direction Dm of the moving blade inclined portion 48C passes through the gap between the stationary blade 7 located on the upstream side of the moving blade 4 and the stationary blade cavity 8 of the rotating shaft 1, and has the energy of the swirl component. It is preferable to follow the direction of no steam leakage flow FLs. The inclination direction of the rotor blade inclination portion 48C is preferably set at an angle of, for example, about 5 to 45 degrees with respect to the central axis direction Da. Further, the end 48s of the blade inclined portion 48C on the outer side in the radial direction Dr, that is, the portion protruding inward in the radial direction Dr is 10 chord length of the blade main body 40C from the front edge end of the blade main body 40C. It may be formed in a range of ˜30%. In the portion other than the end 48s of the rotor blade inclined portion 48C, the inner end face in the radial direction Dr is along the central axis Ac.

According to the steam turbine 100 and the stationary blade 7 as described above, the steam leakage flow FLm having the energy of the swirl component can be made to follow the stationary blade inclined portion 77C as in the first embodiment. . Thereby, it is possible to suppress a loss that occurs when the steam leakage flow FLm hits the stationary blade 7. Therefore, the steam leakage flow FLm can be satisfactorily merged with the main steam FM along the stationary blade 7, the mixing loss with the steam leakage flow FLm can be reduced, and the efficiency of the steam turbine 100 can be improved. it can.

Further, the end 77s of the stationary blade inclined portion 77C is provided to face the moving blade cavity 20 in the central axis direction Da. With this configuration, the steam leakage flow FLm passing through the gap between the moving blade cavity 20 and the tip of the moving blade body 40C on the outer side in the radial direction Dr flows in the direction along the central axis direction Da. The blade inclined portion 77C can be accepted as it is. Thereby, the loss when the steam leakage flow FLm and the stationary blade 7 collide can be effectively suppressed.

Further, according to the steam turbine 100 and the moving blade 4 as described above, the leakage of the steam that does not have the energy of the swirling component through the gap between the stationary blade 7 and the casing 2 located on the upstream side of the moving blade 4. The flow FLs can be made to follow the blade inclined portion 48C. As a result, it is possible to suppress the loss that occurs when the steam leakage flow FLs hits the rotor blade 4. Therefore, the steam leakage flow FLs can be satisfactorily merged with the main steam FM along the moving blade 4, the mixing loss with the steam leakage flow FLs can be reduced, and the efficiency of the steam turbine 100 can be improved. it can.

Further, the end 48s of the blade inclined portion 48C is provided so as to face the stationary blade cavity 8 in the central axis direction Da. With this configuration, the steam leakage flow FLs passing through the gap between the stationary blade cavity 8 and the tip of the stationary blade body 70C in the radial direction Dr flows in the direction along the central axis direction Da, The blade inclined portion 48C can be accepted as it is. Thereby, the loss when the steam leakage flow FLs and the rotor blade 4 collide can be effectively suppressed.

Note that the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.
For example, in each of the embodiments described above, both the blade inclined portions 48A and 48C formed on the moving blade 4 and the stator blade inclined portions 77A and 77C formed on the stationary blade 7 are provided. Only need to have at least.

Further, in each of the above embodiments, the description has been made based on an example in which a steam turbine is applied as an axial flow rotary machine. However, the aspect of the axial flow rotary machine is not limited to the steam turbine, and other devices such as a gas turbine and an aircraft jet engine can be applied as the axial flow rotary machine.

Further, the configuration of the above-described embodiment and each modification may be combined as appropriate.

According to the axial flow rotating machine, the stationary blade, and the moving blade according to the present invention, the mixing loss between the main flow of the working fluid and the leakage flow of the working fluid can be reduced, and the efficiency of the axial flow rotating machine can be increased.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 1S Outer peripheral surface 2 Casing 2S Inner peripheral surface 3 Rotor blade stage 4 Rotor blade 5 Bearing device 5A Journal bearing 5B Thrust bearing 6 Stator blade stage 7 Stator blade 8 Stator blade cavity 10 Inlet port 11 Exhaust port 20 Rotor blade cavity 27 Recess 40A, 40C Moving blade body 41 Moving blade shroud 42 Moving blade side fin 43 Platform 44A Moving blade first shape portion 44B, 44C Moving blade second shape portion 45 Moving blade front edge (moving blade first edge)
46 Moving blade trailing edge (second moving blade edge)
47 Moving blade intermediate portions 48A, 48C Moving blade inclined portion 48s End portions 70A, 70C Stator blade body 71 Stator blade shroud 72 Stator blade side fin 73A Stator blade first shape portion 73B, 73C Stator blade second shape portion 74 Stator blade leading edge (Static blade first edge)
75 Stator blade trailing edge (Static blade second edge)
76 Stator blade intermediate part 77A, 77C Stator blade inclined part 77s End part 87 Recess 100 Steam turbine Ac Central axis Da Central axis direction Dk Inclined direction Dm Inclined direction Dr Radial direction FM Main flow FLm Leakage flow FLs between the moving blade and casing FLs Leakage flow between the stationary blade and the rotating shaft Ht, Hu Blade height R Rotating direction Rz Direction opposite to rotating direction

Claims (11)

1. A rotating shaft that rotates about a central axis;
   A platform provided on the radially outer side of the rotating shaft, and a bucket having a blade main body provided to extend radially outward from the platform;
   A cylindrical casing that is disposed radially outside the rotating shaft and the moving blade, and in which the working fluid flows from the upstream side toward the downstream side along the central axis direction,
   A stationary blade body provided to extend radially inward from the casing, and a stationary blade having a stationary blade shroud provided radially inward of the stationary blade body,
   The stationary blade body is
   In the stationary blade body, with respect to the upstream stationary blade leading edge portion and the downstream stationary blade trailing edge portion, a stationary blade intermediate portion between the stationary blade leading edge portion and the stationary blade trailing edge portion, A stationary blade first shape portion curved so as to be convex in a direction opposite to the rotation direction of the rotation shaft;
   It is formed on the radially outer side with respect to the stationary blade first shape portion, and is opposite to the rotation direction of the rotary shaft toward the upstream side with respect to the stationary blade leading edge portion of the stationary blade first shape portion. A stationary blade second shape portion having a stationary blade inclined portion extending to the side;
   An axial flow rotating machine comprising:
2. The stationary blade inclined portion is formed such that a displacement amount in the direction opposite to the rotation direction of the rotary shaft with respect to the stationary blade leading edge portion gradually increases from the stationary blade first shape portion toward the radially outer side. Being
   The axial-flow rotating machine according to claim 1.
3. The stationary blade inclined portion is formed in a connection portion with the casing in the stationary blade body.
   The axial flow rotary machine according to claim 1 or 2.
4. In the casing, a blade cavity that is recessed radially outward is formed on the radially outer side of the blade main body located on the upstream side of the stationary blade,
   At least a part of the stationary blade inclined portion is provided to face the moving blade cavity in the central axis direction.
   The axial-flow rotary machine as described in any one of Claim 1 to 3.
5. The blade main body is
   The blade intermediate portion between the blade front edge and the blade trailing edge with respect to the upstream blade front edge and the downstream blade trailing edge of the blade body, A moving blade first shape portion curved so as to be convex in the rotation direction of the rotation shaft;
   It is formed on the inner side in the radial direction with respect to the moving blade first shape portion, and extends toward the upstream side of the rotating shaft with respect to the moving blade front edge portion of the moving blade first shape portion. A moving blade second shape portion having a moving blade inclined portion;
   Comprising
   The axial-flow rotary machine as described in any one of Claim 1 to 4.
6. The moving blade inclined portion is formed such that the amount of displacement of the rotating blade toward the rotating direction of the rotating shaft with respect to the moving blade leading edge portion gradually increases inward in the radial direction from the moving blade first shape portion. ,
   The axial-flow rotating machine according to claim 5.
7. The blade inclined portion is formed at a connection portion with the rotating shaft in the blade main body.
   The axial flow rotary machine according to claim 5 or 6.
8. On the rotating shaft, a stationary blade cavity that is recessed radially inward is formed on the radially inner side of the stationary blade body that is located upstream of the moving blade,
   At least a part of the blade inclined portion is provided to face the stationary blade cavity in the central axis direction,
   The axial-flow rotary machine as described in any one of Claim 5 to 7.
9. A rotating shaft that rotates about a central axis;
   A platform provided on the radially outer side of the rotating shaft, and a bucket having a blade main body provided to extend radially outward from the platform;
   A cylindrical casing that is disposed radially outside the rotating shaft and the moving blade, and in which the working fluid flows from the upstream side toward the downstream side along the central axis direction,
   A stationary blade body provided to extend radially inward from the casing, and a stationary blade having a stationary blade shroud provided radially inward of the stationary blade body,
   The blade main body is
   The blade intermediate portion between the blade front edge and the blade trailing edge with respect to the upstream blade front edge and the downstream blade trailing edge of the blade body, A moving blade first shape portion curved so as to be convex in the rotation direction of the rotation shaft;
   It is formed on the inner side in the radial direction with respect to the moving blade first shape portion, and extends toward the upstream side of the rotating shaft with respect to the moving blade front edge portion of the moving blade first shape portion. A moving blade second shape portion having a moving blade inclined portion;
   An axial flow rotating machine comprising:
10. A stationary blade body provided so as to extend radially inward from the casing of the axial-flow rotating machine in which the rotation shaft is rotatably provided around the central axis in the casing;
    The stationary blade body is
    In the stationary blade body, the stationary blade first edge and the stationary blade first edge portion on the first side in the central axis direction and the stationary blade second edge portion on the second side in the central axis direction. A stationary blade first shape portion curved so that a stationary blade intermediate portion between the blade second edge portions is convex in a direction opposite to the rotation direction of the rotation shaft;
    It is formed on the radially outer side with respect to the stationary blade first shape portion, and with respect to the stationary blade first edge portion of the stationary blade first shape portion, the rotation direction of the rotary shaft toward the first side; A stationary blade second shape portion having a stationary blade inclined portion extending in the opposite direction side;
    Comprising a stationary blade.
11. A rotating blade body provided in the casing so as to extend radially outward from a rotating shaft of an axial-flow rotating machine provided rotatably around a central axis;
    The blade main body is
    The moving blade first edge and the moving blade with respect to the moving blade first edge portion on the first side in the central axis direction of the moving blade body and the moving blade second edge portion on the second side in the central axis direction. A moving blade first shape portion curved so that a moving blade intermediate portion between the blade second edges is convex in the rotation direction of the rotating shaft;
    It is formed on the radially inner side with respect to the moving blade first shape portion, and with respect to the moving blade first edge portion of the moving blade first shape portion, toward the first side in the rotation direction side of the rotating shaft A moving blade second shape portion having a moving blade inclined portion extending to
    Equipped with a moving blade.

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