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Abradable bucket shroud

A technology of moving blades and shrouds, which is applied in the direction of engine components, machines/engines, blade support components, etc., and can solve problems such as efficiency loss, reduced component life, and abrasion of the tip of the moving blade.

Active Publication Date: 2012-05-02
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The need to maintain adequate spacing without significant loss of efficiency is made more difficult by the fact that centrifugal force causes the buckets to expand in an outward direction towards the shroud as the turbine rotates
However, if the tip of the bucket rubs against the shroud, the tip of the bucket can be abrasive
This abrasion can lead to increased spacing and reduced component life between

Method used

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Examples

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Embodiment Construction

[0056] Referring now to the drawings, in which like numerals refer to like elements throughout the several views, figure 1 A schematic diagram of gas turbine engine 10 as may be described herein is shown. Gas turbine engine 10 may include a compressor 15 . Compressor 15 compresses incoming air flow 20 . Compressor 15 delivers compressed air flow 20 to combustor 25 . Combustor 25 mixes compressed air stream 20 with compressed fuel stream 30 and ignites the mixture to generate combustion gas stream 35 . Although only a single combustor 25 is shown, the gas turbine engine 10 may include any number of combustors 25 . The combustion gas stream 35 is in turn delivered to a turbine 40 . Combustion gas flow 35 drives turbine 40 to produce mechanical work. The mechanical work produced in turbine 40 drives compressor 15 and an external load 45 such as a generator.

[0057] Gas turbine generator 10 may utilize natural gas, various types of syngas, and / or other types of fuels. Gas ...

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Abstract

The present application provides an abradable bucket shroud (100) for use with a bucket tip (75) so as to limit a leakage flow (240) therethrough and reduce heat loads thereon. The abradable bucket shroud (100) may include a base (120) and a number of ridges (110) positioned thereon. The ridges (110) may be made from an abradable material (130). The ridges may form a pattern (140). The ridges may have a number of curves (190, 200) with at least a first curve (190) and a second curve (200) and with the second curve having a reverse camber shape (210).

Description

technical field [0001] The present application relates generally to gas turbine engines, and more particularly to optimal shapes for abradable patterns on bucket shrouds used in gas turbine engines and the like. Background technique [0002] In general, the efficiency of gas turbine engines tends to increase with increasing combustion temperature. However, higher combustion temperatures can cause various issues related to the integrity, metallurgy, and life expectancy of components within the hot combustion gas path and elsewhere. These issues are difficult, especially for components such as the rotating buckets and stationary turbine shrouds positioned in the preceding stages of the turbine. [0003] High turbine efficiency also requires that the buckets rotate with minimal disturbance within the turbine casing or shroud in order to prevent undesired "leakage" of hot combustion gases over the tips of the buckets. The need to maintain sufficient spacing without significant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/14F01D5/20
CPCF01D11/122F01D5/225
Inventor J·A·塔尔曼
Owner GENERAL ELECTRIC TECH GMBH
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