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Title: Electrochemical machining process for forming surface roughness elements on a gas turbine shroud

Abstract

The back side recessed cooling surface of a shroud defining in part the hot gas path of a turbine is electrochemically machined to provide surface roughness elements and spaces therebetween to increase the heat transfer coefficient. To accomplish this, an electrode with insulating dielectric portions and non-insulating portions is disposed in opposition to the cooling surface. By passing an electrolyte between the cooling surface and electrode and applying an electrical current between the electrode and a shroud, roughness elements and spaces therebetween are formed in the cooling surface in opposition to the insulating and non-insulating portions of the electrode, hence increasing the surface area and heat transfer coefficient of the shroud.

Inventors:
 [1];  [2];  [3];  [4]
  1. (Cincinnati, OH)
  2. (Simpsonville, SC)
  3. (Mechanicville, NY)
  4. (Rexford, NY)
Issue Date:
Research Org.:
General Electric Company (Schenectady, NY)
OSTI Identifier:
874385
Patent Number(s):
6379528
Assignee:
General Electric Company (Schenectady, NY) NETL
DOE Contract Number:  
FC21-95MC31176
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electrochemical; machining; process; forming; surface; roughness; elements; gas; turbine; shroud; recessed; cooling; defining; hot; path; electrochemically; machined; provide; spaces; therebetween; increase; heat; transfer; coefficient; accomplish; electrode; insulating; dielectric; portions; non-insulating; disposed; opposition; passing; electrolyte; applying; electrical; current; formed; hence; increasing; heat transfer; gas turbine; electrical current; hot gas; surface roughness; forming surface; gas path; machining process; /205/

Citation Formats

Lee, Ching-Pang, Johnson, Robert Alan, Wei, Bin, and Wang, Hsin-Pang. Electrochemical machining process for forming surface roughness elements on a gas turbine shroud. United States: N. p., 2002. Web.
Lee, Ching-Pang, Johnson, Robert Alan, Wei, Bin, & Wang, Hsin-Pang. Electrochemical machining process for forming surface roughness elements on a gas turbine shroud. United States.
Lee, Ching-Pang, Johnson, Robert Alan, Wei, Bin, and Wang, Hsin-Pang. Tue . "Electrochemical machining process for forming surface roughness elements on a gas turbine shroud". United States. https://www.osti.gov/servlets/purl/874385.
@article{osti_874385,
title = {Electrochemical machining process for forming surface roughness elements on a gas turbine shroud},
author = {Lee, Ching-Pang and Johnson, Robert Alan and Wei, Bin and Wang, Hsin-Pang},
abstractNote = {The back side recessed cooling surface of a shroud defining in part the hot gas path of a turbine is electrochemically machined to provide surface roughness elements and spaces therebetween to increase the heat transfer coefficient. To accomplish this, an electrode with insulating dielectric portions and non-insulating portions is disposed in opposition to the cooling surface. By passing an electrolyte between the cooling surface and electrode and applying an electrical current between the electrode and a shroud, roughness elements and spaces therebetween are formed in the cooling surface in opposition to the insulating and non-insulating portions of the electrode, hence increasing the surface area and heat transfer coefficient of the shroud.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Patent:

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