Self-aspirating high-area-ratio inter-turbine duct assembly...

Details Self-aspirating high-area-ratio inter-turbine duct assembly... Self-aspirating high-area-ratio inter-turbine duct assembly...

2005-02-08

2005-02-08

Freay, Charles G. (Department: 3746)

Power plants

Combustion products used as motive fluid

Process

C060S039500, C060S805000, C415S144000, C415S914000

Reexamination Certificate

active

06851264

ABSTRACT:
In various embodiments, the present invention provides a means for improving gas turbine engine performance by applying fluid flow control to the inter-turbine duct joining a high-pressure turbine spool and an associated low-pressure turbine spool, allowing the low-pressure turbine spool to have a relatively larger diameter than the high-pressure turbine spool. One or more unobstructed fluid flow paths between one or more boundary layer suction ports disposed within the upstream end of the outer-body surface of the inter-turbine duct and the suction side of the associated low-pressure turbine nozzle are provided. Advantageously, the natural static pressure difference between these points results in a self-aspirating assembly. The fluid flow control provided by the respective suction and blowing forces generated allows for a relatively larger diameter low-pressure turbine spool and/or relatively fewer low-pressure turbine nozzles to be used than is possible with conventional systems, assemblies, and methods. Thus, a gas turbine engine weight savings and optimized performance may be achieved.

REFERENCES:
patent: 3088281 (1963-05-01), Ernest et al.
patent: 3641766 (1972-02-01), Uehling
patent: 4515524 (1985-05-01), Fisher, Jr.
patent: 5826424 (1998-10-01), Klees
“Flow Control Opportunities in Gas Turbine Engines”, by W.K. Lord et al, Conference Proceedings, American Institute of Aeronautics and Astronautics, Jun. 19-22, 2000/Denver, CO, pp. 1-15.

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