Turbine blade with ultrasonic wave scattering feature

Patent metadata

Field	Value
Publication number	US-10648950-B2
Application number	US-201615756802-A
Country	US
Kind code	B2
Filing date	Aug 17, 2016
Priority date	Sep 2, 2015
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The invention relates to a turbine blade comprising a platform edge surface including an ultrasonic wave scattering feature comprising surface irregularities adapted to alter a reflection path of an ultrasonic pulse wave.

First claim

The invention claimed is:

1. A turbine blade comprising:
a root section for engaging with a rotor;
a platform having a bottom surface connected to the root section, a top surface distal to the root section, and an edge circumscribing the platform and comprising an edge surface orthogonal to the bottom surface and the top surface; and
an airfoil extending from the top surface of the platform, the airfoil having a suction side and a pressure side;
wherein a portion of the edge surface of the platform proximate to the suction side comprises a plurality of serrated teeth that are arranged to form a plurality of ridges, each ridge interspaced with a valley and extending perpendicularly to the top surface.

2. The turbine blade of claim 1 , wherein at least one of the plurality of serrated teeth has a height perpendicular to the edge surface extending between a ridge of the plurality of ridges and an adjacent valley, the height being in a range of 0.4 mm to 2.0 mm.

3. The turbine blade of claim 1 , wherein at least one of the plurality of serrated teeth has a height perpendicular to the edge surface extending between a ridge of the plurality of ridges and an adjacent valley, the height being 0.5 mm.

4. The turbine blade of claim 1 , wherein a pitch is defined as a distance between a first valley and an adjacent second valley; and wherein the pitch of at least one of the plurality of serrated teeth is in a range of 0.5 mm to 2.0 mm.

5. The turbine blade of claim 1 , wherein the pitch of at least one of the plurality of serrated teeth is 1 mm.

6. The turbine blade of claim 1 , wherein the plurality of serrated teeth extends across the edge surface.

7. The turbine blade of claim 1 , configured as a multi-stage steam turbine blade.

8. The turbine blade of claim 7 , configured as a last stage steam turbine blade.

Assignees

• General Electric Tech Gmb
• Gen Electric

Inventors

• Ripamonti Luca Marie
• Kaiser Andreas
• Udell Christophe
• Wielgat Marcin

Classifications

• F05D2220/31

  in steam turbines · CPC title

• G01N2291/044

  Internal reflections (echoes), e.g. on walls or defects · CPC title

• F05D2250/183

  zigzag · CPC title

• F01D5/26 Primary

  Antivibration means not restricted to blade form or construction or to blade-to-blade connections {or to the use of particular materials} · CPC title

• G01N2291/2693

  Rotor or turbine parts · CPC title