Managing low pressure turbine maximum speed in a turbofan engine
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United States of America Patent
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Jan 10, 2017
Grant Date -
Jan 7, 2010
app pub date -
Oct 12, 2006
filing date -
Oct 12, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A turbofan engine control system for managing a low pressure turbine speed is provided. The turbofan engine control system includes a low spool having a low pressure turbine that are housed in a core nacelle. The low pressure turbine is adapted to rotate at a speed and includes a maximum design speed. A turbofan is coupled to the low spool. A fan nacelle surrounds the turbofan and core nacelle and provides a bypass flow path. The bypass flow path includes a nozzle exit area. A controller is programmed to command a flow control device adapted to effectively decrease the nozzle exit area in response to a condition. Reducing the nozzle exit area, either physically or otherwise, maintains the speed below the maximum design speed.
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