Runner for a hydraulic turbine or pump and method of manufacturing

Patent metadata

Field	Value
Publication number	US-11359595-B2
Application number	US-201917040296-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Mar 22, 2018
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A runner for a hydraulic turbine or pump includes a plurality of blades, each blade being defined by a pressure surface, an oppositely facing suction surface, a leading edge and a spaced apart trailing edge. At least one blade has a device for supplying a flow of oxygen containing gas to the trailing edge of at least one of the blades. The profile of the suction side surface of the blade along a cross section through a point P1 and a point P2 is concave. The point P1 is located on the suction side surface of the trailing edge where an opening is located, the point P2 is spaced apart from the point P1 by less than 3% of the runner outlet diameter D and the point P2 is located upstream of the point P1 on a line perpendicular to the trailing edge starting at the point P1.

First claim

The invention claimed is:

1. A runner for a hydraulic turbine or pump, the runner comprising:
a plurality of blades, each blade defined by a pressure side surface, an oppositely facing suction side surface, a leading edge and a spaced apart trailing edge;
at least one of said blades having a device for supplying a flow of oxygen containing gas to said trailing edge of said at least one blade, said device including a gas inlet aperture, a gas passage and at least one opening in said trailing edge to admit gas out of said gas passage to a passing fluid during operation of the runner;
said suction side surface of said at least one blade having a concave profile along a cross section through a point P 1 and a point P 2 , said point P 1 being located on said suction side surface of said trailing edge at said at least one opening, said point P 2 being spaced apart from said point P 1 by less than 3% of a runner outlet diameter D and said point P 2 being located upstream of said point P 1 on a line perpendicular to said trailing edge starting at said point P 1 .

2. The runner according to claim 1 , wherein a first normal vector on said suction side surface located at said point P 1 and a second normal vector on said suction side surface located at said point P 2 enclose an angle of at least 2 degrees.

3. The runner according to claim 1 , wherein the runner is an axial flow runner including a hub and said plurality of blades extending from said hub at circumferentially spaced intervals.

4. The runner according to claim 1 , wherein the runner is a Francis turbine including a crown, a band and said plurality of blades extending from said crown to said band at circumferentially spaced intervals.

5. The runner according to claim 1 , wherein said pressure side surface extends further than said suction side surface measured from said leading edge along a section camberline in a region of said opening.

6. A method of manufacturing a runner, the method comprising:
providing the runner according to claim 1 including said at least one blade having said trailing edge and said gas passage;
providing a piece of material; and
connecting the piece of material to said trailing edge of said at least one blade.

7. The method according to claim 6 , which further comprises forming said at least one opening in said piece of material before connecting said piece of material to said at least one blade, and connecting said at least one opening to said gas passage of said blade after connecting said piece of material to said trailing edge of said at least one blade.

8. The method according to claim 6 , which further comprises forming said at least one opening in said piece of material after connecting said piece of material to said at least one blade, and connecting said at least one opening to said gas passage of said at least one blade after connecting said piece of material to said trailing edge of said at least one blade.

Assignees

• Voith Patent Gmbh

Inventors

• Coulson Stuart
• Foust Jason
• Zoll Jesse
• Mchale Steven
• Jiang Jianbo
• Harmer Brandon

Classifications

• F03B3/183 Primary

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

• F03B3/121 Primary

  Blades, their form or construction · CPC title

• Y02E10/20

  Hydro energy · CPC title

• F05D2240/24

  for turbines · CPC title

• F05B2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title