Variable geometry hysteresis control for a gas turbine engine

Details Variable geometry hysteresis control for a gas turbine engine Variable geometry hysteresis control for a gas turbine engine

2011-01-11

2011-12-20

Casaregola, Louis (Department: 3741)

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

Reexamination Certificate

active

08079221

ABSTRACT:
One embodiment of the present application is a gas turbine engine with a compressor that includes a variable geometry mechanism to vary working fluid flow area. A desired state of this mechanism is selected different than a current state to change the amount of flow area. The mechanism has a hysteresis band corresponding to a difference between increasing the flow area to reach the desired state and decreasing the flow area to reach the desired state. To control operation of the mechanism within this hysteresis band, a determination is made whether the desired state corresponds to a greater flow area or a lesser flow area relative to the current state.

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