Cooled turbine blade

• US 4,056,332 A
• Filed: 05/05/1976
• Issued: 11/01/1977
• Est. Priority Date: 05/16/1975
• Status: Expired due to Term

• Current Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Original Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Inventors: Meloni, Beat
• Primary Examiner(s): Powell, Jr., Everette A.
• Application Number:
  US05/683,488
• Time in Patent Office: 545 Days
• Field of Search: 416/96, 416/96 A, 416/92, 416/97, 416/97 A, 415/115
• US Class Current: 416/97.00A
• CPC Class Codes: F01D 5/188 with an insert in the blade cavity to guide the cooling fluid, e.g. forming a separation wall
• CPC Class Codes: F05D 2260/201 by impingement of a fluid

Abstract

A turbine blade includes a longitudinally extending cavity into which air for cooling the interior wall of the blade is admitted. The air passes from the cavity through each of a group of inserts each of which is constituted by a plurality of stepped overlapping walls with spaced air passages therethrough, these walls establishing therebetween corresponding cooling spaces interconnected by the passages and which are bounded at one side by the blade wall. The cooling air passes in succession through the cooling spaces of each insert and is discharged from the insert and thence from the blade through an outlet port formed in the blade wall and which is connected to the last cooling space of each insert through which the air is passed. The passages through the overlapping walls also provide impingement cooling of the blade wall. The outlet ports for the cooling air are formed in the suction side of the blade as well as in its trailing edge.

Claims

1. A turbine blade including a cavity extending generally longitudinally therein and into which air for cooling the interior wall of the blade is admitted, a plurality of inserts disposed in the cavity adjacent the interior wall of the blade and arranged in a row between the leading and trailing edges thereof, each said insert being constituted by a plurality of stepped overlapping walls with air passages therethrough and which establish therebetween corresponding adjacent air turbulence and cooling spaces interconnected by said passages and bounded respectively at one side by the interior blade wall, the cooling air passing from said cavity into and through the cooling spaces of each said insert in succession for impingement upon the blade wall and being discharged to the exterior of the blade through an outlet port formed in the blade wall.

2. An air cooled turbine blade as defined in claim 1 wherein said air passages through said stepped overlapped walls of each insert are arranged in groups of rows.

3. An air cooled turbine blade as defined in claim 1 wherein said outlet port is located at the suction side of the blade.