JP2008138585A - Turbine bucket and steam turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbine bucket capable of surely discharging, to the outside of the turbine bucket, water droplets generated by passing a front edge region on the back surface side of the turbine bucket, and colliding with the back surface, and flowing down along the back surface, and water droplets increasing as approaching a bucket root part side and adhering to the front surface of the turbine bucket. <P>SOLUTION: This turbine bucket 1 includes the back surface 31, a bucket root part 37, and a bucket tip part 36, and rotates around a rotary shaft (not shown in fig.). The turbine bucket is provided with separation grooves 2 each having a part or the whole part extending on the back surface 31 side, and on the downstream side relative to a center line 10 between an axial center line 11 of the turbine bucket 1 extending toward the rotary shaft, and the front edge 8 of the turbine bucket 1, and guiding the water droplets 7 adhering to the front surface to the outside. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a turbine blade provided with a separation groove capable of efficiently discharging water droplets adhering to a surface outward.

  When the steam turbine blade is used in steam with high wetness, moisture in the steam in the wet state flows down in the turbine together with the steam in the form of water droplets. In the rotor blade flow path section, the turbine rotor blades rotate at a large peripheral speed, so that a large inertial force acts on the water droplets as compared to vapor, which is a gas. For this reason, many water droplets collide and adhere to the surface of a turbine rotor blade.

  The water droplets attached in this manner are subjected to centrifugal force generated as the turbine blades rotate and steam shearing force. For this reason, such water droplets flow on the surface of the turbine blade as a water film in the radial direction and toward the downstream side of the turbine blade. Further, some of the water droplets flow out from the downstream side of the turbine blade and flow into the next blade. If such water droplets cannot be smoothly discharged to the outside of the turbine rotor blade, the turbine rotor blade may be eroded and the performance of the entire turbine may be deteriorated.

  Conventionally, as shown in FIGS. 13 and 14, a separation groove 2 extending in parallel toward the outer peripheral side in the radial direction is provided in the front edge region 8 a on the rear surface 31 side of the turbine blade 1, and the turbine blade 1 rotates. There is known a method of discharging water droplets 7 adhering to the turbine rotor blade 1 to the outer peripheral side in the radial direction by the centrifugal force generated by this (for example, Patent Document 1).

Further, as shown in FIG. 15 and FIG. 16, the position is not overlapped with the cover (shroud) 3 provided at the blade tip portion 36 of the turbine blade 1, and the radial direction toward the back surface 31 side of the turbine blade 1. A method of discharging water droplets 7 by installing separation grooves 2 extending in parallel toward the outer peripheral side is also known.
JP 11-159302 A

  As shown in FIG. 14, the steam 16 flows into the turbine rotor blade 1 having the separation groove 2 at an angle close to the geometric inflow angle α, whereas the water droplet 7 has a geometric inflow angle α and It flows with a large shift.

  At this time, the water droplet 7 generated by colliding with the front edge region 8a (A part) on the rear surface 31 side of the turbine blade 1 and flowing down along the rear surface 31 is the front edge on the rear surface 31 side of the turbine blade 1. The separation groove 2 provided in the region 8a and extending in parallel toward the outer peripheral side in the radial direction can be removed. However, water droplets 7 that pass through the front edge region 8a (A part) on the rear surface 31 side of the turbine rotor blade 1 and collide with the B part on the rear surface 31 side and flow down along the rear surface 31 are removed. I can't.

  That is, as shown in FIG. 13 and FIG. 14, the moisture in the region extending along the relative velocity vector V of the water droplet 7 with respect to the turbine rotor blade 1 from the region on the front edge 8 side from the separation groove 2 is separated from the separation groove 2 by the turbine motion. Although it can be discharged to the outside of the blade 1, the region extending along the relative velocity vector V of the water droplet 7 with respect to the turbine blade 1 from the region on the trailing edge 9 side of the separation groove 2 and the region between the turbine blade 1 Moisture cannot be discharged outside the turbine blade 1.

  Therefore, as shown in FIG. 13 and FIG. 14, the region extending along the relative velocity vector V of the water droplet 7 with respect to the turbine rotor blade 1 from the region closer to the leading edge 8 than the separation groove 2 is a moisture that can remove moisture. The region between the turbine blades 1 and the region extending along the relative velocity vector V of the water droplets 7 with respect to the turbine blades 1 from the region on the trailing edge 9 side of the separation groove 2 and the turbine blades 1 removes moisture. This is a moisture irremovable area IA that cannot be removed.

  Further, as shown in FIG. 15, in the general turbine rotor blade 1, the blade root portion 37 side cross section has a larger area than the blade tip portion 36 side cross section, and the blade root portion 36 to the blade root portion. 37, the amount of water droplets 7 that pass through the leading edge region 8a of the turbine blade 1 and collide with the surface of the turbine blade 1 increases.

  However, as shown in FIG. 15, the conventional separation groove 2 extends in parallel toward the radially outer peripheral side of the turbine rotor blade 1. For this reason, the water droplet 7 adhering to the surface of the turbine rotor blade 1 which increases as it goes to the blade root portion 37 side cannot be reliably discharged to the outside of the turbine rotor blade 1.

  The present invention has been made in consideration of such points, and is generated by colliding with the rear surface through the front edge region on the rear surface side of the turbine rotor blade, and water droplets flowing down along the rear surface, An object of the present invention is to provide a turbine rotor blade capable of reliably discharging water droplets adhering to the surface of the turbine rotor blade that increases toward the blade root portion to the outside of the turbine rotor blade, and a steam turbine having the turbine rotor blade. To do.

  The present invention provides a turbine rotor blade that is partially or downstream from the center line between the axial center line of the turbine rotor blade that extends toward the rotation axis and the leading edge of the turbine rotor blade. A turbine blade having a separation groove that extends all over and that guides water droplets adhering to the surface to the outside.

  The present invention relates to a turbine rotor blade, in which a part or all of the turbine blade extends downstream from the axial center line of the turbine rotor blade that extends toward the rotation axis and removes water droplets adhering to the surface. A turbine rotor blade having a separation groove that leads toward the rear.

  The present invention provides a turbine rotor blade that is partially or downstream from the center line between the axial center line of the turbine rotor blade extending toward the rotation axis and the trailing edge of the turbine rotor blade. A turbine blade having a separation groove that extends all over and that guides water droplets adhering to the surface to the outside.

  The present invention provides a turbine rotor blade having a separation groove that extends to the rear side and approaches the leading edge of the turbine rotor blade as it goes from the blade root to the blade tip and guides water droplets adhering to the surface outward. A turbine rotor blade characterized by comprising the turbine rotor blade.

  In the present invention, the blade tip is provided with a cover that is integral with or separate from the blade tip, and the portion of the separation groove on the blade tip side is located upstream from the upstream end of the cover. Among these, the blade root portion side portion is a turbine rotor blade characterized in that the portion is located on the downstream side of the upstream end portion line extending from the upstream end of the cover toward the rotation axis.

  The present invention is a steam turbine having the turbine blade described above.

  According to the present invention, the separation groove that guides the water droplets adhering to the surface to the outside is provided on the back surface of the turbine blade at an appropriate position and shape, so that the front edge region on the back side of the turbine blade is formed. Water droplets that are generated by passing through and colliding with the back surface and flowing down along the back surface, and water droplets that adhere to the surface of the turbine blade that increases toward the blade root, are reliably discharged to the outside of the turbine blade. It is possible to provide a turbine blade and a steam turbine having the turbine blade.

First Embodiment Hereinafter, a first embodiment of a turbine rotor blade 1 according to the present invention will be described with reference to the drawings. Here, FIG. 1 to FIG. 4 are diagrams showing a first embodiment of the present invention.

  As shown in FIGS. 1 and 2, the turbine rotor blade 1 has a back surface 31 and an abdominal surface 32, a blade root portion 37 and a blade tip portion 36, and is rotatable about a rotation axis (not shown). It has become. Further, the turbine rotor blade 1 has a front edge 8 that becomes the front side when rotating, and a rear edge 9 that becomes the rear side when rotating. The turbine rotor blades 1 are arranged in a line around the rotation axis (see FIG. 2). The turbine rotor blade 1 is disposed on the downstream side of the turbine stationary blade (not shown).

  Further, as shown in FIG. 1, on the rear surface 31 side of the turbine rotor blade 1, between the axial center line 11 of the turbine rotor blade 1 extending toward the rotation axis and the front edge 8 of the turbine rotor blade 1. Two separation grooves 2 are provided on the downstream side of the center line 10. The separation grooves 2 partially extend to guide the water droplets 7 attached to the surface of the turbine rotor blade 1 to the outside of the turbine rotor blade 1. The number of separation grooves 2 need not be limited to two.

  Next, the operation of the turbine rotor blade 1 having such a configuration will be described.

  First, in FIG. 2, steam 16 that has passed through a turbine stationary blade (not shown) flows between the turbine rotor blades 1 arranged in a row.

  Next, such steam 16 causes the turbine rotor blade 1 to rotate around a rotating shaft (not shown) at a large peripheral speed, thereby generating electricity.

  At this time, since the turbine blade 1 rotates in the steam 16 having a high wetness, many water droplets 7 collide with and adhere to the surface of the turbine blade (see FIG. 14). Here, as shown in FIG. 1, a part of the separation groove 2 is between the axial center line 11 of the rear surface 31 of the turbine blade 1 extending toward the rotation axis and the front edge 8 of the turbine blade 1. It extends downstream from the center line 10. Therefore, as shown in FIGS. 2 to 4, according to the turbine rotor blade 1 of the present invention, the leading edge region 8 a on the rear surface 31 side of the turbine rotor blade 1 that could not be removed by the conventional separation groove 2. It is possible to remove the water droplets 7 that pass through the rear surface 31 and collide with the rear surface 31 and flow down along the rear surface 31.

  Therefore, as shown in FIGS. 2 to 4, a region extending along the relative velocity vector V of the water droplet 7 with respect to the turbine blade 1 in the range from the front edge 8 of the rear surface 31 of the turbine blade 1 to the rearmost surface portion 33. Can be the moisture removable region RA from which moisture can be removed, and the moisture unremovable region IA from which moisture cannot be removed can be kept in the region between the turbine rotor blades 1.

  As a result, water droplets 7 adhering to the turbine rotor blade 1 can be reliably discharged to the outside of the turbine rotor blade 1, so that the erosion of the turbine rotor blade 1 can be prevented and the performance of the entire turbine is improved. Can be made.

  By the way, in the above, a part of the separation groove 2 extends downstream from the center line 10 between the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft and the front edge 8 of the turbine rotor blade 1. However, the present invention is not limited to this, and the separation groove 2 is entirely in front of the turbine blade 1 and the axial centerline 11 of the turbine blade 1 extending toward the rotating shaft. It may extend downstream from the center line 10 between the edges 8.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment shown in FIG. 5, a part of the separation groove 2 is a center between the axial center line 11 of the turbine blade 1 extending toward the rotation axis and the leading edge 8 of the turbine blade 1. Instead of extending downstream from the line 10, it extends downstream from the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft, and other configurations are shown in FIGS. This is substantially the same as the first embodiment shown in FIG.

  In the second embodiment shown in FIG. 5, the same parts as those in the first embodiment shown in FIGS.

  As shown in FIG. 5, a part of the separation groove 2 extends downstream from the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft.

  Therefore, it is possible to remove the water droplets 7 that pass through the front edge region 8a on the rear surface 31 side of the turbine rotor blade 1 and collide with the rear surface 31 and flow down along the rear surface 31 (FIGS. 2 to 2). (See FIG. 4). As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

  By the way, in the above description, a part of the separation groove 2 has been described by using an aspect in which the separation blade 2 extends downstream from the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft. Instead, the entire separation groove 2 may extend downstream from the axial center line 11 of the turbine rotor blade 1 extending toward the rotation axis.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment shown in FIG. 6, a part of the separation groove 2 is a center between the axial center line 11 of the turbine blade 1 extending toward the rotating shaft and the leading edge 8 of the turbine blade 1. Instead of extending downstream from the line 10, downstream from the center line 12 between the axial centerline 11 of the turbine blade 1 extending toward the rotation axis and the trailing edge 9 of the turbine blade 1. The other configuration is substantially the same as that of the first embodiment shown in FIGS.

  In the third embodiment shown in FIG. 6, the same parts as those in the first embodiment shown in FIGS.

  As shown in FIG. 6, a part of the separation groove 2 is downstream of the center line 12 between the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft and the trailing edge 9 of the turbine rotor blade 1. It extends to.

  For this reason, it is generated by colliding with the rear surface 31 through the front edge region 8a on the rear surface 31 side of the turbine rotor blade 1 that could not be removed by the conventional separation groove 2, and along the rear surface 31. The water droplets 7 flowing down can be removed (see FIGS. 2 to 4). As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

  By the way, in the above, a part of the separation groove 2 extends downstream from the center line 12 between the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft and the trailing edge 9 of the turbine rotor blade 1. However, the present invention is not limited to this, and the separation groove 2 is entirely behind the axial centerline 11 of the turbine blade 1 extending toward the rotating shaft and the turbine blade 1. It may extend downstream from the center line 12 between the edges 9.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment shown in FIG. 7, a part of the separation groove 2 is a center between the axial center line 11 of the turbine blade 1 extending toward the rotation axis and the leading edge 8 of the turbine blade 1. Instead of extending to the downstream side of the line 10, the leading edge of the turbine rotor blade 1 extends from the blade root portion 37 toward the blade tip portion 36 without being caught by the center lines 10, 11, 12, etc. It is provided so as to approach the eight directions, and the other configurations are substantially the same as those of the first embodiment shown in FIGS.

  In the fourth embodiment shown in FIG. 7, the same parts as those in the first embodiment shown in FIGS.

  As shown in FIG. 7, the separation groove 2 approaches the leading edge 8 of the turbine rotor blade 1 as it goes from the blade root portion 37 toward the blade tip portion 36.

  In the general turbine rotor blade 1, the cross section on the blade root portion 37 side has a larger area than the cross section on the blade tip portion 36 side, and the turbine rotor blade increases from the blade tip portion 36 toward the blade root portion 37. The amount of water droplets 7 that pass through one leading edge region 8a and collide with the surface of the turbine rotor blade 1 increases (see FIGS. 3 and 4).

  For this reason, as shown in FIG. 7, the turbine blade 1 approaches the leading edge 8 direction from the blade root portion 37 toward the blade tip portion 36 (that is, the turbine moves from the blade tip portion 36 toward the blade root portion 37). By providing the separation groove 2 (separated from the direction of the leading edge 8 of the rotor blade 1), the water droplets 7 attached to the surface of the turbine rotor blade 1 can be reliably discharged outward. As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment shown in FIG. 8, the portion 13 on the blade tip 36 side of the separation groove 2 has an axial centerline 11 of the turbine blade 1 extending toward the rotation axis and the front of the turbine blade 1. The axial center line 11 of the turbine rotor blade 1 and the turbine are located upstream of the center line 10 between the edges 8 and the portion 14 on the blade root 37 side of the separation groove 2 extends toward the rotation axis. It is located on the downstream side of the center line 10 between the moving blade 1 and the leading edge 8. Further, a cover (shroud) 3 is provided on the trailing edge 9 side of the blade tip 36 of the turbine rotor blade 1. Other configurations are substantially the same as those of the first embodiment shown in FIGS. By the way, the upstream side means the upstream side of the steam 16 flowing into the turbine blade 1, and the downstream side means the downstream side of the steam 16 flowing into the turbine blade 1.

  In the fifth embodiment shown in FIG. 8, the same parts as those in the first embodiment shown in FIGS.

  As shown in FIG. 8, the portion 13 on the blade tip 36 side of the separation groove 2 is between the axial center line 11 of the turbine blade 1 extending toward the rotating shaft and the leading edge 8 of the turbine blade 1. The portion 14 on the blade root portion 37 side of the separation groove 2 that is located upstream of the center line 10 of the turbine blade 1 extends toward the rotation axis and the axial center line 11 of the turbine blade 1 and the turbine blade 1. It is located downstream of the center line 10 between the front edge 8.

  For this reason, the water droplet 7 adhering to the surface of the turbine rotor blade 1 which increases as it goes to the blade root portion 37 side can be reliably discharged to the outside of the turbine rotor blade 1. Further, it does not interfere with the cover 3 provided at the blade tip 36 of the turbine rotor blade 1, passes through the front edge region 8 a on the rear surface 31 side of the turbine rotor blade 1, and is generated by colliding with the rear surface 31. The water droplets 7 flowing down along the back surface 31 can be removed. As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIG. In the sixth embodiment shown in FIG. 9, the portion 13 on the blade tip 36 side of the separation groove 2 is located upstream of the axial center line 11 of the turbine rotor blade 1 extending toward the rotation axis. The portion 14 on the blade root 37 side of the separation groove 2 is located downstream of the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft. Other configurations are substantially the same as those of the second embodiment shown in FIG.

  In the sixth embodiment shown in FIG. 9, the same parts as those of the second embodiment shown in FIG.

  As shown in FIG. 9, the portion 13 on the blade tip portion 36 side of the separation groove 2 is located upstream of the axial center line 11 of the turbine rotor blade 1 extending toward the rotating shaft, and the separation groove 2 Of these, the portion 14 on the blade root portion 37 side is located downstream of the axial centerline 11 of the turbine rotor blade 1 extending toward the rotation axis.

  For this reason, the water droplet 7 adhering to the surface of the turbine rotor blade 1 which increases as it goes to the blade root portion 37 side can be reliably discharged to the outside of the turbine rotor blade 1. Further, it does not interfere with the cover 3 provided at the blade tip 36 of the turbine rotor blade 1, passes through the front edge region 8 a on the rear surface 31 side of the turbine rotor blade 1, and is generated by colliding with the rear surface 31. The water droplets 7 flowing down along the back surface 31 can be removed. As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

Seventh Embodiment Next, a seventh embodiment of the present invention will be described with reference to FIG. In the seventh embodiment shown in FIG. 10, the portion 13 on the blade tip 36 side of the separation groove 2 has an axial center line 11 of the turbine blade 1 extending toward the rotation axis and the rear of the turbine blade 1. The axial center line 11 of the turbine rotor blade 1 and the turbine are located upstream of the center line 12 between the edge 9 and the portion 14 on the blade root 37 side of the separation groove 2 extending toward the rotation axis. It is located downstream of the center line 12 between the moving blade 1 and the trailing edge 9. Other configurations are substantially the same as those of the third embodiment shown in FIG.

  In the seventh embodiment shown in FIG. 10, the same parts as those of the third embodiment shown in FIG.

  As shown in FIG. 10, the portion 13 on the blade tip portion 36 side of the separation groove 2 is between the axial center line 11 of the turbine blade 1 extending toward the rotating shaft and the trailing edge 9 of the turbine blade 1. The portion 14 on the blade root 37 side of the separation groove 2 is located on the upstream side of the center line 12 of the turbine blade 1. It is located downstream of the center line 12 between the edge 9.

  For this reason, the water droplet 7 adhering to the surface of the turbine rotor blade 1 which increases as it goes to the blade root portion 37 side can be reliably discharged to the outside of the turbine rotor blade 1. Further, it does not interfere with the cover 3 provided at the blade tip 36 of the turbine rotor blade 1, passes through the front edge region 8 a on the rear surface 31 side of the turbine rotor blade 1, and is generated by colliding with the rear surface 31. The water droplets 7 flowing down along the back surface 31 can be removed. As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

Eighth Embodiment Next, an eighth embodiment of the present invention will be described with reference to FIG. In the eighth embodiment shown in FIG. 11, the cover 3 is provided on the blade tip portion 36 as a unit with or separately from the blade tip portion 36. Further, the portion 13 on the blade tip 36 side of the separation groove 2 is provided in a range not overlapping the cover 3 in the rotation axis direction. Other configurations are substantially the same as those of the fourth embodiment shown in FIG.

  In the eighth embodiment shown in FIG. 11, the same parts as those in the fourth embodiment shown in FIG.

  As shown in FIG. 11, the portion 13 on the blade tip 36 side of the separation groove 2 does not overlap the cover 3 in the rotation axis direction. Further, the separation groove 2 approaches the leading edge 8 direction of the turbine rotor blade 1 as it goes from the blade root portion 37 to the blade tip portion 36 (that is, the separation groove 2 extends from the blade tip portion 36 to the blade root portion 37. It is away from the direction of the leading edge 8 of the turbine rotor blade 1).

  For this reason, the water droplet 7 adhering to the surface of the turbine rotor blade 1 which increases as it goes to the blade root portion 37 side can be reliably discharged to the outside of the turbine rotor blade 1. Further, it does not interfere with the cover 3 provided at the blade tip 36 of the turbine rotor blade 1, passes through the front edge region 8 a on the rear surface 31 side of the turbine rotor blade 1, and is generated by colliding with the rear surface 31. The water droplets 7 flowing down along the back surface 31 can be removed. As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

Ninth Embodiment Next, a ninth embodiment of the present invention will be described with reference to FIG. In the ninth embodiment shown in FIG. 12, a part of the separation groove 2 is a center between the axial center line 11 of the turbine blade 1 extending toward the rotation axis and the leading edge 8 of the turbine blade 1. Instead of extending downstream from the line 10, the portion 13 of the separation groove 2 on the blade tip 36 side is located upstream of the upstream end 3 u of the cover 3 and the blade root of the separation groove 2. The portion 14 on the side of the portion 37 is located on the downstream side of the upstream end line 15 extending from the upstream end 3u of the cover 3 toward the rotation axis, and other configurations are shown in FIGS. This is substantially the same as the first embodiment shown.

  In the eighth embodiment shown in FIG. 12, the same parts as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 12, the portion 13 on the blade tip portion 36 side of the separation groove 2 is located upstream from the upstream end 3 u of the cover 3, and the portion 14 on the blade root portion 37 side of the separation groove 2 is located. The cover 3 is located downstream of the upstream end line 15 extending from the upstream end 3u of the cover 3 toward the rotation axis.

  For this reason, the water droplet 7 adhering to the surface of the turbine rotor blade 1 which increases as it goes to the blade root portion 37 side can be reliably discharged to the outside of the turbine rotor blade 1. Further, it does not interfere with the cover 3 provided at the blade tip 36 of the turbine rotor blade 1, passes through the front edge region 8 a on the rear surface 31 side of the turbine rotor blade 1, and is generated by colliding with the rear surface 31. The water droplets 7 flowing down along the back surface 31 can be removed. As a result, erosion of the turbine rotor blade 1 can be prevented, and the performance of the entire turbine can be improved.

The side view which looked at the turbine rotor blade by the 1st Embodiment of this invention from the circumferential direction. 1 is a cross-sectional view of a turbine rotor blade according to a first embodiment of the present invention viewed from a radial direction. The sectional view which looked at the blade tip part side of the turbine bucket according to the 1st embodiment of the present invention from the radial direction. The sectional view which looked at the blade root part side of the turbine bucket according to the 1st embodiment of the present invention from the radial direction. The side view which looked at the turbine rotor blade by the 2nd Embodiment of this invention from the circumferential direction. The side view which looked at the turbine rotor blade by the 3rd Embodiment of this invention from the circumferential direction. The side view which looked at the turbine rotor blade by the 4th Embodiment of this invention from the circumferential direction. The side view which looked at the turbine rotor blade by the 5th Embodiment of this invention from the circumferential direction. The side view which looked at the turbine rotor blade by the 6th Embodiment of this invention from the circumferential direction. The side view which looked at the turbine rotor blade by the 7th Embodiment of this invention from the circumferential direction. The side view which looked at the turbine rotor blade by the 8th Embodiment of this invention from the circumferential direction. The side view which looked at the turbine rotor blade by the 9th Embodiment of this invention from the circumferential direction. Sectional drawing which looked at the conventional turbine rotor blade from radial direction. FIG. 14 is an enlarged view in which the vicinity of a separation groove of the conventional turbine rotor blade shown in FIG. 13 is enlarged. The side view which looked at the conventional turbine rotor blade from the circumferential direction. Sectional drawing which looked at the conventional turbine rotor blade provided with the cover from the radial direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turbine blade 2 Separation groove 3 Cover 3u Cover upstream end 8 Leading edge 8a Leading edge region 9 Trailing edge 10 Between the axial center line of the turbine blade extending toward the rotation axis and the leading edge of the turbine blade Centerline 11 Axial centerline 12 of the turbine blade extending toward the rotational axis 12 Centerline 15 between the axial centerline of the turbine blade extending toward the rotational axis and the trailing edge of the turbine blade Upstream end line 16 Steam 31 Back surface 32 Abdominal surface 36 Blade tip 37 Blade root V Relative velocity vector RA of turbine blades Moisture removal possible area IA Moisture removal impossible area α Geometric inflow angle

Claims (10)

In turbine blades,
A part or all of the rear surface side extends downstream from the center line between the axial center line of the turbine rotor blade extending toward the rotation axis and the leading edge of the turbine rotor blade. A turbine rotor blade comprising a separation groove for guiding attached water droplets outward. In turbine blades,
A separation groove that extends partly or entirely on the back side and downstream of the axial center line of the turbine rotor blade extending toward the rotating shaft and that guides water droplets adhering to the surface outward is provided. Turbine blades characterized by that. In turbine blades,
A part or all of the rear side extends downstream from the center line between the axial center line of the turbine blade extending toward the rotation axis and the trailing edge of the turbine blade, and A turbine rotor blade comprising a separation groove for guiding attached water droplets outward. In turbine blades,
Turbine motion characterized in that it has a separation groove that extends to the rear side and approaches the leading edge of the turbine blade as it goes from the blade root to the blade tip and guides water droplets adhering to the surface outward Wings. The blade tip side portion of the separation groove is located upstream of the center line between the axial center line of the turbine blade extending toward the rotating shaft and the leading edge of the turbine blade,
The part of the blade root portion side of the separation groove is located downstream of the center line between the axial center line of the turbine blade extending toward the rotating shaft and the leading edge of the turbine blade. The turbine rotor blade according to claim 1. The part on the blade tip side of the separation groove is located upstream of the axial center line of the turbine blade extending toward the rotation axis,
The turbine rotor blade according to claim 2, wherein a portion of the separation groove on the blade root portion side is located downstream of an axial center line of the turbine rotor blade extending toward the rotating shaft. The blade tip side portion of the separation groove is located upstream of the center line between the axial center line of the turbine blade extending toward the rotation axis and the trailing edge of the turbine blade,
A portion of the separation groove on the blade root side is located downstream of a center line between the axial center line of the turbine blade extending toward the rotation axis and the trailing edge of the turbine blade. The turbine rotor blade according to claim 3. The wing tip is provided with a cover that is integral with or separate from the wing tip,
The turbine rotor blade according to claim 4, wherein a portion on the blade tip portion side of the separation groove does not overlap the cover in the rotation axis direction. The wing tip is provided with a cover that is integral with or separate from the wing tip,
The portion of the separation groove on the blade tip side is located upstream from the upstream end of the cover,
The blade root portion side portion of the separation groove is located downstream of the upstream end line extending from the upstream end of the cover toward the rotation axis.   A steam turbine having the turbine rotor blade according to any one of claims 1 to 9.

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