| CPC F02C 7/268 (2013.01) [F01D 15/10 (2013.01); F01D 25/34 (2013.01); F01D 25/36 (2013.01); F02C 9/00 (2013.01); F01D 21/00 (2013.01); F05D 2260/80 (2013.01); F05D 2260/85 (2013.01); F05D 2260/941 (2013.01); F05D 2270/303 (2013.01)] | 18 Claims |
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1. A gas turbine engine comprising:
an electrically-powered motor configured to rotate a driven spool of the gas turbine engine;
a primary controller configured to conduct a primary function using the motor, the primary function selected from the group consisting of:
a gas turbine start operation in which the motor drives the driven spool to rotate to an ignition speed for engine ignition;
power generation for powering an airframe pressurization system of the gas turbine engine, where the motor is a compound motor and generator; and
power generation for transferring power to an airframe system, where the motor is a compound motor and generator;
a bow controller configured to selectively control the motor to perform a rotor bow mitigation operation in which the motor drives the driven spool to rotate to mitigate a non-uniform thermal distribution in a rotor of a spool of the gas turbine engine;
wherein the rotor bow mitigation operation is variable, and wherein the bow controller is configured to determine one or more operating variables of the rotor bow mitigation operation based on one or more physical parameters relating to a thermal condition of the gas turbine engine, and/or based on one or more operational parameters relating to the gas turbine engine;
wherein the gas turbine engine is configured to draw power from an energy storage device for the rotor bow mitigation operation, and wherein the bow controller is configured to determine one or more operating variables of the rotor bow mitigation operation based on one or more energy parameters relating to the energy storage device;
wherein the energy parameter comprises at least one of: a charge of the energy storage device, and a discharge capacity of the energy storage device; and
wherein the bow controller is configured to determine the one or more operating variables of the rotor bow mitigation operation by selecting between a plurality of sets of one or more predetermined operating variables associated with different rates of power consumption, based on the energy parameter.
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