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:
-
- Cincinnati, OH
- Simpsonville, SC
- Mechanicville, NY
- Rexford, NY
- Issue Date:
- Research Org.:
- General Electric Co., Schenectady, NY (United States)
- OSTI Identifier:
- 874385
- Patent Number(s):
- 6379528
- Assignee:
- General Electric Company (Schenectady, NY)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B23 - MACHINE TOOLS B23H - WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01D - NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- 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}
}
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