The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 1992
Filed:
May. 25, 1990
Applicant:
Inventors:
Frederick M Schwarz, Glastonbury, CT (US);
Clifton J Crawley, Jr, Glastonbury, CT (US);
Anthony F Rauseo, Middletown, CT (US);
Assignee:
United Technologies Corporation, Hartford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02C / ;
U.S. Cl.
CPC ...
60 3902 ; 60 3975 ;
Abstract
The present invention discloses a method of restoring exhaust gas temperature (EGT) margin in a gas turbine engine equipped with a modulating valve and other hardware for shrinking the turbine case relative to the turbine rotors. The method involves increasing the minimum flow area of the modulating valve at all engine operating conditions after the engine experiences some wear and operational deterioration, thereby providing additional cooling flow at take-off and climb conditions to restore both turbine efficiency and EGT margin.