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System for pressure modulation of turbine sidewall cavities

United States Patent

May 28, 2002
View the Complete Patent at the US Patent & Trademark Office
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.
Leone; Sal Albert (Scotia, NY), Book; Matthew David (Altamont, NY), Banares; Christopher R. (Schenectady, NY)
General Electric Company (Schenectady, NY)
09/ 491,599
January 25, 2000
This invention was made with Government support under contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.