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

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874385

Lee, Ching-Pang ^[1]; Johnson, Robert Alan ^[2]; Wei, Bin ^[3]; Wang, Hsin-Pang ^[4]

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1. Cincinnati, OH
2. Simpsonville, SC
3. Mechanicville, NY
4. Rexford, NY

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.

• Research Organization: General Electric Co., Schenectady, NY (United States)
• DOE Contract Number: FC21-95MC31176
• Assignee: General Electric Company (Schenectady, NY)
• Patent Number(s): US 6379528
• OSTI ID: 874385
• Country of Publication: United States
• Language: English

Related Subjects

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
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