Cooled constructional element for a gas turbine

• US 8,444,376 B2
• Filed: 07/28/2011
• Issued: 05/21/2013
• Est. Priority Date: 01/30/2009
• Status: Expired due to Fees

• Current Assignee: Ansaldo Energia IP UK Limited (Ansaldo Energia SPA)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Krueckels, Joerg, Pathak, Milan
• Primary Examiner(s): Wiehe, Nathaniel
• Assistant Examiner(s): BROWN, ADAM WAYNE
• Application Number:
  US13/192,656
• Publication Number:
  US 20120020768A1
• Time in Patent Office: 663 Days
• Field of Search: 416/97.A, 416/96.R, 416/95, 416/90.R, 416/97.R
• US Class Current: 415/116
• CPC Class Codes: F01D 25/12 Cooling
• CPC Class Codes: F01D 5/187 Convection cooling
• CPC Class Codes: F05D 2240/81 Cooled platforms
• CPC Class Codes: F05D 2260/201 by impingement of a fluid

Abstract

A cooled constructional element for a gas turbine includes a wall having a front and a rear side. The front side is configured to be thermally loaded during operation of the turbine, and the rear side has a plurality of pins projecting therefrom in a two-dimensional distribution, the two-dimensional distribution including a higher density distribution of pins in a critical zone of the cooled constructional element than in the remaining regions of the cooled constructional element. A device is configured to create jets of a cooling medium that are directed onto the rear side of the wall in a region of the plurality of pins so as to cool the rear side of the wall by impingement.

Claims

1. A cooled constructional element for a gas turbine comprising:

a wall including a front side and a rear side, the front side being configured to be thermally loaded during operation of the turbine and the rear side having a plurality of pins projecting therefrom in a two-dimensional distribution, the two-dimensional distribution including a higher density distribution of pins in a critical zone of the cooled constructional element than in the remaining regions of the cooled constructional element; and

an impingement cooling plate having a plurality of impingement cooling holes in a distributed arrangement and configured to create jets of a cooling medium that are directed onto the rear side of the wall in a region of the plurality of pins so as to cool the rear side of the wall by impingement, the impingement cooling plate being disposed essentially parallel at a distance to the rear side of the wall and the distributed arrangement of the plurality of cooling holes corresponding to the two-dimensional distribution of the plurality of pins such that, in a direction perpendicular to the impingement cooling plate, the plurality of cooling holes are respectively disposed between the plurality of pins.

2. The cooled constructional element as recited in claim 1, wherein a density of the plurality of impingement cooling holes is locally the same as a density of the plurality of pins.

3. The cooled constructional element as recited in claim 1, wherein the cooled constructional element is a stator blade including a blade airfoil extending in a longitudinal direction, wherein the wall is a base of a platform adjoining the blade airfoil and extending transversely to the longitudinal direction, and wherein the critical zone is an area of the rear side of the wall toward a concavity that is disposed at a transition between the blade airfoil and the platform.

4. A stator blade for a gas turbine comprising:

a blade airfoil extending in a longitudinal direction;

a platform adjoining the blade airfoil and extending transversely to the longitudinal direction, the platform including a base having a front side and a rear side, the front side being configured to be thermally loaded during operation of the turbine and the rear side having a plurality of pins projecting therefrom in a two-dimensional distribution, the two-dimensional distribution including a higher density distribution of pins in a critical zone of the stator blade than in the remaining regions of the stator blade; and

an impingement cooling plate configured to create jets of a cooling medium that are directed onto the rear side of the base in a region of the plurality of pins so as to cool the rear side of the base by impingement, the impingement cooling plate being disposed essentially parallel at a distance to the rear side of the base and the distributed arrangement of the plurality of cooling holes corresponding to the two-dimensional distribution of the plurality of pins such that, in a direction perpendicular to the impingement cooling plate, the plurality of cooling holes are respectively disposed between the plurality of pins.

5. The stator blade as recited in claim 4, wherein a density of the plurality of impingement cooling holes is locally the same as a density of the plurality of pins.