Electrochemical machining process for forming surface roughness elements on a gas turbine shroud
US6379528B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Dec 25, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2260/22141
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.