Reversible pump turbine and guide vane for the reversible pump turbine

Patent metadata

Field	Value
Publication number	US-11649798-B2
Application number	US-201917258221-A
Country	US
Kind code	B2
Filing date	Aug 12, 2019
Priority date	Aug 14, 2018
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

A reversible pump-turbine and also a guide vane for a reversible pump-turbine with a guide vane body, a pivot for rotating the guide vane body around an axis of rotation and two end faces. The guide vane body has a turbine leading edge facing the turbine flow and a turbine trailing edge facing away from the turbine flow, where the individual guide vanes come into contact with one another along closing edges when the wicket gate is closed, where the guide vanes each have two flow-guiding surfaces on either side of the axis of rotation and opposite one another that are limited by the two end faces. These two flow-guiding surfaces have different flow profiles.

First claim

The invention claimed is:

1. A pump-turbine wicket gate comprising plural guide vanes that each comprise a guide vane body having opposite end faces and being pivotable about an axis of rotation via a pivot, the guide vane body having a turbine leading edge facing a direction of turbine flow and a turbine trailing edge facing away from the direction turbine flow,
wherein the guide vanes of the wicket gate can assume a closed position and an open position and, when in the closed position, respective adjacent guide vanes contact one another along respective closing edges defined contact curves, each guide vane having two flow-guiding surfaces positioned on opposite sides of the axis of rotation and being limited by the opposite end faces, the flow-guiding surfaces forming different flow profiles, and
wherein one flow profile of said different flow profiles is located in a mid-span section of each respective guide vane and has a larger guide vane angle toward the turbine trailing edge than other flow profiles of said different flow profiles in a boundary area of each respective guide vane proximate the opposite end faces, such that, in the open position, the one flow profile in the mid-span section of each respective guide vane creates a larger absolute flow angle (α2) of absolute velocity (C2) of the turbine flow at the guide vane trailing edge in a turbine direction with regard to a related circumferential component of the absolute velocity (C2u) of the turbine flow, than one of the other flow profiles in the boundary area such that the turbine flow in the turbine direction leaves the guide vane body in the mid-span section with a larger flow angle (α2) than in the boundary area.

2. The pump-turbine wicket gate of claim 1 , wherein the turbine trailing edge is curved at least once.

3. The pump-turbine wicket gate of claim 1 , wherein the closing edge is curved at least once.

4. The pump-turbine wicket gate of claim 1 , wherein the closing edge has a double curvature.

5. The pump-turbine wicket gate of claim 2 , wherein the turbine trailing edge has a double curvature.

6. The pump-turbine wicket gate of claim 1 , wherein the turbine trailing edge is curved in the mid-span section in a direction that is perpendicular to a plane defined by the axis of rotation and a connecting line between the turbine leading edge and the turbine trailing edge.

7. The pump-turbine wicket gate of claim 2 , wherein the turbine trailing edge is curved in the mid-span section in a direction that is perpendicular to a plane defined by the axis of rotation and a connecting line between the turbine leading edge and the turbine trailing edge.

8. The pump-turbine wicket gate of claim 3 , wherein the turbine trailing edge is curved in the mid-span section in a direction that is perpendicular to a plane defined by the axis of rotation and a connecting line between the turbine leading edge and the turbine trailing edge.

9. The pump-turbine wicket gate of claim 6 , wherein the turbine trailing edge is curved in a direction of a guide vane pressure side.

10. The pump-turbine wicket gate of claim 1 , wherein a position of at least one of said flow profiles is rotated around a straight line that is disposed parallel to the axis of rotation.

11. The pump-turbine wicket gate of claim 2 , wherein a position of at least one of said flow profiles is rotated around a straight line that is disposed parallel to the axis of rotation.

12. The pump-turbine wicket gate of claim 3 , wherein a position of at least one of said flow profiles is rotated around a straight line that is disposed parallel to the axis of rotation.

13. The pump-turbine wicket gate of claim 1 , wherein a radial position of at least one of said flow profiles is misaligned in relation to a straight line that is disposed parallel to the axis of rotation.

14. The pump-turbine wicket gate of claim 1 , wherein the turbine leading edge is curved at least once.

15. The pump-turbine wicket gate of claim 2 , wherein the turbine leading edge is curved at least once.

16. The pump-turbine wicket gate of claim 3 , wherein the turbine leading edge is curved at least once.

17. The pump-turbine wicket gate of claim 1 , wherein the turbine trailing edge is curved at least once such that an inflection point of the curve lies in the mid-span section.

18. The pump-turbine wicket gate of claim 1 , wherein the other flow profiles in the respective boundary area are not congruent.

19. The pump-turbine wicket gate of claim 1 arranged on a reversible pump-turbine having a runner.

20. A pump-turbine wicket gate comprising plural guide vanes that each comprise a guide vane body having opposite end faces and being pivotable about an axis of rotation via a pivot, the guide vane body having a turbine leading edge facing a direction of turbine flow and a turbine trailing edge facing away from the direction turbine flow,
wherein the guide vanes of the wicket gate can assume a closed position and an open position and, when in the closed position, respective adjacent guide vanes contact one another along respective closing edges defined contact curves, each guide vane having two flow-guiding surfaces positioned on opposite sides of the axis of rotation and being limited by the opposite end faces, the flow-guiding surfaces forming different flow profiles,
wherein one flow profile of said different flow profiles is located in a mid-span section of each respective guide vane and has a larger guide vane angle toward the turbine trailing edge than other flow profiles of said different flow profiles in a boundary area of each respective guide vane proximate the opposite end faces, such that, in the open position, the one flow profile in the mid-span section of each respective guide vane creates a larger absolute flow angle (α2) of absolute velocity (C2) of the turbine flow at the guide vane trailing edge in a turbine direction with regard to a related circumferential component of the absolute velocity (C2u) of the turbine flow, than one of the other flow profiles in the boundary area such that the turbine flow in the turbine direction leaves the guide vane body in the mid-span section with a larger flow angle (α2) than in the boundary area, and
wherein the turbine leading edge, the turbine trailing edge and the closing edge are each curved at least once, and the turbine trailing edge is curved in the mid-span section in a direction that is perpendicular to a plane defined by the axis of rotation and a connecting line between the turbine leading edge and the turbine trailing edge.

21. A reversable pump-turbine comprising:
a runner; and
a wicket gate comprising plural adjustable guide vanes that each comprise a guide vane body having opposite end faces and being pivotable about an axis of rotation via a pivot, the guide vane body having a turbine leading edge facing a direction of turbine flow and a turbine trailing edge facing away from the direction turbine flow,
wherein the guide vanes of the wicket gate can assume a closed position and an open position and, when in the closed position, respective adjacent guide vanes contact one another along respective closing edges defined contact curves, each guide vane having two flow-guiding surfaces positioned on opposite sides of the axis of rotation and being limited by the opposite end faces, the flow-guiding surfaces forming different flow profiles, and
wherein one flow profile of said different flow profiles is located in a mid-span section of each respective guide vane and h

Assignees

• Andritz Ag Maschf

Inventors

• Lenarcic Markus

Classifications

• F05B2240/304

  Details of the trailing edge · CPC title

• F03B3/10

  characterised by having means for functioning alternatively as pumps or turbines {(starting F03B15/005)} · CPC title

• F03B3/16 Primary

  Stators · CPC title

• F03B3/183 Primary

  Adjustable vanes, e.g. wicket gates · CPC title

• Y02E10/20

  Hydro energy · CPC title