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Title: System for pressure modulation of turbine sidewall cavities

Abstract

A system and method are 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:
 [1];  [2];  [3]
  1. (Scotia, NY)
  2. (Altamont, NY)
  3. (Schenectady, NY)
Issue Date:
Research Org.:
General Electric Company (Schenectady, NY)
OSTI Identifier:
874454
Patent Number(s):
6393825
Assignee:
General Electric Company (Schenectady, NY) NETL
DOE Contract Number:  
FC21-95MC31176
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
pressure; modulation; turbine; sidewall; cavities; method; 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. System for pressure modulation of turbine sidewall cavities. United States: N. p., 2002. Web.
Leone, Sal Albert, Book, Matthew David, & Banares, Christopher R. System for pressure modulation of turbine sidewall cavities. United States.
Leone, Sal Albert, Book, Matthew David, and Banares, Christopher R. Tue . "System for pressure modulation of turbine sidewall cavities". United States. https://www.osti.gov/servlets/purl/874454.
@article{osti_874454,
title = {System for pressure modulation of turbine sidewall cavities},
author = {Leone, Sal Albert and Book, Matthew David and Banares, Christopher R.},
abstractNote = {A system and method are 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 = {2002},
month = {1}
}

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