Method for pressure modulation of turbine sidewall cavities
Abstract
A method is provided for controlling cooling air flow for pressure modulation of turbine components, such as the turbine outer sidewall cavities. The pressure at which cooling and purge air is supplied to the turbine outer side wall cavities is modulated, based on compressor discharge pressure (Pcd), thereby to generally maintain the back flow margin (BFM) so as to minimize excessive leakage and the consequent performance deterioration. In an exemplary embodiment, the air pressure within the third stage outer side wall cavity and the air pressure within the fourth stage outer side wall cavity are each controlled to a respective value that is a respective prescribed percentage of the concurrent compressor discharge pressure. The prescribed percentage may be determined from a ratio of the respective outer side wall pressure to compressor discharge pressure at Cold Day Turn Down (CDTD) required to provide a prescribed back flow margin.
- Inventors:
-
- Scotia, NY
- Altamont, NY
- Schenectady, NY
- Issue Date:
- Research Org.:
- General Electric Co., Schenectady, NY (United States)
- OSTI Identifier:
- 874417
- Patent Number(s):
- 6385958
- Assignee:
- General Electric Company (Schenectady, NY)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01D - NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02C - GAS-TURBINE PLANTS
- DOE Contract Number:
- FC21-95MC31176
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- method; pressure; modulation; turbine; sidewall; cavities; provided; controlling; cooling; air; flow; components; outer; purge; supplied; wall; modulated; based; compressor; discharge; pcd; maintain; margin; bfm; minimize; excessive; leakage; consequent; performance; deterioration; exemplary; embodiment; third; stage; cavity; fourth; controlled; value; prescribed; percentage; concurrent; determined; ratio; cold; cdtd; required; provide; air flow; compressor discharge; turbine component; /60/
Citation Formats
Leone, Sal Albert, Book, Matthew David, and Banares, Christopher R. Method for pressure modulation of turbine sidewall cavities. United States: N. p., 2002.
Web.
Leone, Sal Albert, Book, Matthew David, & Banares, Christopher R. Method for pressure modulation of turbine sidewall cavities. United States.
Leone, Sal Albert, Book, Matthew David, and Banares, Christopher R. Tue .
"Method for pressure modulation of turbine sidewall cavities". United States. https://www.osti.gov/servlets/purl/874417.
@article{osti_874417,
title = {Method for pressure modulation of turbine sidewall cavities},
author = {Leone, Sal Albert and Book, Matthew David and Banares, Christopher R},
abstractNote = {A method is provided for controlling cooling air flow for pressure modulation of turbine components, such as the turbine outer sidewall cavities. The pressure at which cooling and purge air is supplied to the turbine outer side wall cavities is modulated, based on compressor discharge pressure (Pcd), thereby to generally maintain the back flow margin (BFM) so as to minimize excessive leakage and the consequent performance deterioration. In an exemplary embodiment, the air pressure within the third stage outer side wall cavity and the air pressure within the fourth stage outer side wall cavity are each controlled to a respective value that is a respective prescribed percentage of the concurrent compressor discharge pressure. The prescribed percentage may be determined from a ratio of the respective outer side wall pressure to compressor discharge pressure at Cold Day Turn Down (CDTD) required to provide a prescribed back flow margin.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2002},
month = {Tue Jan 01 00:00:00 EST 2002}
}