Rotor blade and axial flow rotary machine

Patent metadata

Field	Value
Publication number	US-10794397-B2
Application number	US-201515552624-A
Country	US
Kind code	B2
Filing date	Apr 3, 2015
Priority date	Apr 3, 2015
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A rotor blade ( 22 ) provided in an axial flow compressor ( 1 ) including a rotating shaft, a casing ( 3 ), a diffuser portion ( 4 ) provided on a downstream side of the casing to communicate with a flow path (C) of the casing and form an annular shape and configured to define a diffuser flow path (DC) in which a cross-sectional area of the flow path expands toward the downstream side, a plurality of stator vane rows ( 10 ), and rotor blade rows ( 20 ) performing compression of a gas. A plurality of rotor blades are spaced apart from each other in a circumferential direction, and constitute a final rotor blade row ( 20 A) positioned on a most downstream side among the rotor blade rows, and include a blade portion ( 25 ) having a larger deflection angle on a hub side and a chip side than at a central portion in a blade height direction.

First claim

The invention claimed is:

1. A rotor blade provided in an axial flow rotary machine, wherein
the axial flow rotary machine includes:
a rotating shaft which extends in the direction of a longitudinal axis and rotates about the longitudinal axis;
a casing which supports the rotating shaft to be rotatable from an outer circumferential side and defines a flow path of the fluid between the rotating shaft and the casing;
a diffuser portion provided on a downstream side of the casing to communicate with the flow path and form an annular shape about the longitudinal axis and configured to define a diffuser flow path in which a cross-sectional area of the flow path expands toward the downstream side;
a plurality of stator vane rows provided in a direction of the longitudinal axis and protruding from the casing toward a radial inner side of the longitudinal axis; and
a plurality of rotor blade rows provided adjacent to the stator vane rows in the direction of the longitudinal axis and configured to perform compressing or pressure-feeding of the fluid,
the plurality of rotor blades are provided to be spaced apart from each other in a circumferential direction of the longitudinal axis and configured to constitute a final rotor blade row positioned on a most downstream side of a flow of a fluid among rotor blade rows, and comprises a blade portion having a larger deflection angle on a hub side and a chip side than at a central portion in a blade height direction,
in the blade portion,
the deflection angle is larger on the hub side and the chip side than at the central portion in the blade height direction in each rotor blade,
on an outlet of the blade portion in each rotor blade, a flow direction of the fluid on the hub side and a flow direction of the fluid on the chip side are different from a flow direction of the fluid at the central portion, and
a compression amount of the fluid on the hub side and a compression amount of the fluid on the chip side are larger than a compression amount of the fluid at the central portion.

2. The axial flow rotary machine according to claim 1 , further comprising stator vanes provided to be spaced apart from each other in a circumferential direction of the axis in each of the rows.

3. The axial flow rotary machine according to claim 2 , wherein the diffuser portion is provided in the casing so that the diffuser flow path extends on the downstream side of an end portion on an upstream side of a final rotor blade row and from an upstream side of an end portion on the downstream side of a final stator vane row provided further downstream from the final rotor blade row.

4. The axial flow rotary machine according to claim 3 , wherein, in the diffuser portion, a portion of an inner surface of the diffuser flow path is formed with a portion of the stator vane of the final stator vane row.

5. The axial flow rotary machine according to claim 3 , wherein, in the diffuser portion:
the diffuser flow path is divided into a first region corresponding to a region in the direction of the longitudinal axis in which the final stator vane row is provided, a second region on the downstream side of the first region, and a third region further downstream from the second region; and
an amount of expansion in a cross-sectional area of the flow path in the second region is larger than that in the first region and an amount of expansion in a cross-sectional area of the flow path in the third region is smaller than that in the second region.

6. The axial flow rotary machine according to claim 3 , wherein, in the diffuser portion:
the diffuser flow path is divided into a first region corresponding to a region in the direction of the longitudinal axis in which the final stator vane row is provided, and a second region on the downstream side of the first region; and
an amount of expansion in a cross-sectional area of the flow path in the second region is smaller than that in the first region.

7. The axial flow rotary machine according to claim 3 , wherein, in the diffuser portion, the cross-sectional area of the flow path expands so that an inner surface on a radial outer side of the longitudinal axis in the diffuser flow path is inclined toward the radial outer side toward the downstream side.

8. The axial flow rotary machine according to claim 7 , wherein, in the diffuser portion, the cross-sectional area of the flow path expands so that the inner surface on the radial inner side of the longitudinal axis in the diffuser flow path is inclined toward the radial inner side toward the downstream side.

9. The axial flow rotary machine according to claim 7 , wherein, in the diffuser portion, the cross-sectional area of the flow path expands so that the inner surface on the radial inner side of the longitudinal axis in the diffuser flow path is inclined toward the radial outer side toward the downstream side.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Sakamoto Yasuro
• Hamana Hiroyuki

Classifications

• F01D9/041

  using blades (F01D5/148 takes precedence) · CPC title

• F04D29/547 Primary

  having a special shape in order to influence fluid flow · CPC title

• F04D29/54

  Fluid-guiding means, e.g. diffusers · CPC title

• F04D29/324

  Blades · CPC title

• F04D29/667

  by influencing the flow pattern, e.g. suppression of turbulence · CPC title