Rotary kinetic fluid motors or pumps – Method of operation
Reexamination Certificate
2006-05-25
2008-10-07
Kershteyn, Igor (Department: 3745)
Rotary kinetic fluid motors or pumps
Method of operation
C415S127000
Reexamination Certificate
active
07431557
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.
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Herron William Lee
Krupp Brian Edward
Maruscik Ronald George
Vishnauski Jon Michael
Wiseman Matthew William
Andes William Scott
General Electric Company
Kershteyn Igor
Rosen Steven J.
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