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:
Oct. 07, 2008
Filed:
May. 25, 2006
William Lee Herron, Cincinnati, OH (US);
Matthew William Wiseman, Fairfield, OH (US);
Jon Michael Vishnauski, Loveland, OH (US);
Brian Edward Krupp, Liberty Township, OH (US);
Ronald George Maruscik, Lebanon, OH (US);
William Lee Herron, Cincinnati, OH (US);
Matthew William Wiseman, Fairfield, OH (US);
Jon Michael Vishnauski, Loveland, OH (US);
Brian Edward Krupp, Liberty Township, OH (US);
Ronald George Maruscik, Lebanon, OH (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method to compensate for blade tip clearance deterioration between rotating blade tips and a surrounding shroud in an aircraft gas turbine engine includes determining one or more variables based on at least one or more moving averages of one or more engine operating parameters respectively averaged over a fixed number of operational engine flight cycles and adjusting a flow rate of thermal control air to counter the blade tip clearance deterioration based on the one or more variables. The engine operating parameters may include running number of engine cycles, takeoff and cruise exhaust gas temperature margins, a cruise turbine efficiency, takeoff and cruise maximum turbine speeds, a cruise fuel flow. Some or all of the variables may be differences between the moving averages and corresponding baselines of the engine operating parameters respectively or the variables may all be moving averages. The flow rate may be adjusted incrementally.