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Gas turbine compressor casing flowpath rings

a gas turbine and compressor technology, applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of airfoil b>20/b> tip loss and/or casing flowpath wear, compressor performance and surge margin loss, and gas turbine service loss

Inactive Publication Date: 2007-10-11
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] In an exemplary embodiment of the invention, a flowpath ring is securable in a machined groove of a compressor stator casing. The flowpath ring includes a connector section engageable with the machined groove where the connector section is shaped corresponding t

Problems solved by technology

The end result is airfoil 20 tip loss and / or casing flowpath wear.
These conditions lead to a loss of compressor performance and surge margin.
Typically, this will result in loss of service of the gas turbine for an extended period of time.

Method used

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  • Gas turbine compressor casing flowpath rings
  • Gas turbine compressor casing flowpath rings
  • Gas turbine compressor casing flowpath rings

Examples

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Embodiment Construction

[0012] It would be desirable to facilitate repairs in rotor flowpaths due to rotor airfoil tip rubbing. In this manner, optimum clearances can be restored while recovering performance and surge margin. Also, clearances can be made tighter in order to increase performance and surge margin.

[0013] By utilizing easily replaceable rings installed in the casing where the rotor blades may rub the casing, flowpath repairs can be effected rapidly and efficiently. Additionally, replaceable rings (or flowpath rings) can reduce the rate of heat transfer into the casing, thereby changing the transient and steady state matching of the rotor and casing thermal growth. This allows for a passive clearance controlling design feature that permits tighter clearances between the rotor blades and the casing, adding to overall engine performance and surge margins.

[0014] With reference to FIGS. 1-3, a gas turbine includes a stator casing 12 having a plurality of airfoil grooves 14 machined therein as is ...

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PUM

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Abstract

A flowpath ring is securable in a machined groove of a gas turbine compressor stator casing. The ring includes a connector section engageable with and shaped corresponding to the machined groove. A flowpath section is disposed radially inward relative to the connector section and includes a clearance surface disposed facing a turbine rotor blade. The flowpath section defines a blade flowpath when secured in the turbine stator casing machined groove. The use of flowpath rings facilitates flowpath repair if rotor blade tip rubs occur. Additionally, the rings enable better matching of transient thermal responses between the compressor rotor and compressor casings.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to compressor rotors and stator casings and, more particularly, to rings set in dedicated grooves in the stator casing that define the outer flowpath and that can be easily replaced in the event of rotor airfoil tip rubbing. [0002] With reference to FIG. 1, showing a cross-sectional view of a typical gas turbine, gas turbines attain optimum performance when the clearance 22 between rotating blades 20 and the casing 12 is maintained at an optimal distance, which is generally very small, e.g., 40-80 mils at steady state temperatures. This clearance must be made large enough, however, to account for part stack up tolerance, mechanical and thermal growth differences between the casing 12 and the rotating airfoil 20. [0003] A common occurrence in gas turbine compressors is rotor blades rubbing on compressor casings for various reasons. Rubbing can be caused by a number of conditions such as improper alignment between the ro...

Claims

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Application Information

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IPC IPC(8): F01D11/08
CPCF05D2240/11F01D9/04F01D11/14F02C3/04
Inventor MOREE, JEFFPOCCIA, NICHOLAS P.GAGNE, LYNN C.GOETZE, RAYMOND H.JOHNSON, DAVID MARTIN
Owner GENERAL ELECTRIC CO