Gas turbine engine bowed rotor avoidance system
First Claim
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1. A bowed rotor prevention system for a gas turbine engine of an aircraft, the bowed rotor prevention system comprising:
- a bowed rotor prevention motor operable to drive rotation of a starting spool of the gas turbine engine through an engine accessory gearbox; and
a controller operable to engage the bowed rotor prevention motor and drive rotation of the starting spool until a bowed rotor prevention threshold condition is met or a bowed rotor prevention shutdown request to halt rotation of the starting spool is received, wherein after detecting the bowed rotor prevention shutdown request, the controller is operable to resume driving rotation of the starting spool based on determining that the bowed rotor prevention shutdown request is no longer detected and the bowed rotor prevention threshold condition has not been met.
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Abstract
A bowed rotor prevention system for a gas turbine engine of an aircraft is provided. The bowed rotor prevention system includes a bowed rotor prevention motor operable to drive rotation of a starting spool of the gas turbine engine through an engine accessory gearbox. The bowed rotor prevention system also includes a controller operable to engage the bowed rotor prevention motor and drive rotation of the starting spool until a bowed rotor prevention threshold condition is met or a bowed rotor prevention shutdown request to halt rotation of the starting spool is received.
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Citations
17 Claims
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1. A bowed rotor prevention system for a gas turbine engine of an aircraft, the bowed rotor prevention system comprising:
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a bowed rotor prevention motor operable to drive rotation of a starting spool of the gas turbine engine through an engine accessory gearbox; and a controller operable to engage the bowed rotor prevention motor and drive rotation of the starting spool until a bowed rotor prevention threshold condition is met or a bowed rotor prevention shutdown request to halt rotation of the starting spool is received, wherein after detecting the bowed rotor prevention shutdown request, the controller is operable to resume driving rotation of the starting spool based on determining that the bowed rotor prevention shutdown request is no longer detected and the bowed rotor prevention threshold condition has not been met. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A gas turbine engine of an aircraft, the gas turbine engine comprising:
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a starting spool coupled to an engine accessory gearbox; an energy storage device; and a bowed rotor prevention system comprising; a bowed rotor prevention motor operable to drive rotation of the starting spool through the engine accessory gearbox based on energy received from the energy storage device; and a controller operable to engage the bowed rotor prevention motor and drive rotation of the starting spool until a bowed rotor prevention threshold condition is met or a bowed rotor prevention shutdown request to halt rotation of the starting spool is received, wherein after detecting the bowed rotor prevention shutdown request, the controller is operable to resume driving rotation of the starting spool based on determining that the bowed rotor prevention shutdown request is no longer detected and the bowed rotor prevention threshold condition has not been met. - View Dependent Claims (10, 11)
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12. A method for bowed rotor prevention for a gas turbine engine of an aircraft, the method comprising:
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engaging a bowed rotor prevention motor with a starting spool of the gas turbine engine through an engine accessory gearbox of the gas turbine engine; driving rotation of the starting spool by the bowed rotor prevention motor until a bowed rotor prevention threshold condition is met or a bowed rotor prevention shutdown request to halt rotation of the starting spool is received; and after detecting the bowed rotor prevention shutdown request, resuming the driving of rotation of the starting spool based on determining that the bowed rotor prevention shutdown request is no longer detected and the bowed rotor prevention threshold condition has not been met. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification