Abradable CMC stacked laminate ring segment for a gas turbine
US7819625B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2007 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Jul 26, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D11/122
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pattern of depressions (36) in a sealing surface (34) on a CMC wall (32) of gas turbine ring segment (30) allows minimum clearance against turbine blades tips, and thus maximizes working gas sealing. An array of depressions (36) on the surface (34) increases abradability of the surface (34) by blade tip contact during zero clearance conditions and reduces blade tip damage. The depressions (36) are unconnected, preventing bypass of the working gas around the blade tips. A desired abradable surface geometry may be formed in a stacked laminate wall construction (40-43, 52) by staggered laminate edge profiles (50, 52) or by machining of depressions (36, 54) after construction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.