METHOD AND SYSTEM FOR REDUCING HOT SOAKBACK
First Claim
1. A method for cooling a gas turbine engine, the method comprising:
- supplying power to a motor to generate mechanical motion; and
translating the mechanical motion of the motor to a shaft of the gas turbine engine to rotate a compressor stage and a turbine stage after the gas turbine engine has been shutdown to circulate air within the gas turbine engine and cool components of the gas turbine engine.
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Accused Products
Abstract
A method for cooling a gas turbine engine includes supplying power to a motor to generate mechanical motion and translating the mechanical motion of the motor to a shaft of the gas turbine engine to rotate a compressor stage and a turbine stage after the engine has been shutdown to circulate air within the engine and cool engine components. A system for preventing hot soakback in an auxiliary power unit includes a starter motor, a compressor, a turbine, a shaft connected to at least one stage of the compressor and at least one stage of the turbine, a gearbox for connecting the starter motor to the shaft, a temperature sensor and a controller. The controller receives information from the temperature sensor and instructs the starter motor to rotate and drive the shaft when the temperature sensor senses a temperature above a low limit temperature threshold.
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Citations
20 Claims
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1. A method for cooling a gas turbine engine, the method comprising:
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supplying power to a motor to generate mechanical motion; and translating the mechanical motion of the motor to a shaft of the gas turbine engine to rotate a compressor stage and a turbine stage after the gas turbine engine has been shutdown to circulate air within the gas turbine engine and cool components of the gas turbine engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for cooling an auxiliary power unit, the method comprising:
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discontinuing fuel delivery to a combustor of the auxiliary power unit; supplying power to a starter to rotate a starter shaft; and translating rotational motion of the starter shaft to a shaft of the auxiliary power unit to rotate a compressor stage and a turbine stage of the auxiliary power unit to circulate air within the auxiliary power unit until a temperature of the auxiliary power unit is below a low limit temperature threshold. - View Dependent Claims (18)
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19. A system for preventing hot soakback in an auxiliary power unit, the system comprising:
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a starter motor; a compressor having at least one stage; a turbine having at least one stage; a shaft connected to the at least one stage of the compressor and the at least one stage of the turbine; a gearbox for connecting the starter motor to the shaft; a temperature sensor; and a controller for; receiving information from the temperature sensor; and instructing the starter motor to rotate when the temperature sensor senses a temperature above a low limit temperature threshold; wherein the gearbox translates rotation of the starter motor to the shaft to rotate the at least one stage of the compressor and the at least one stage of the turbine to circulate air within the auxiliary power unit in response to the controller when the temperature sensor senses the temperature above the low limit temperature threshold in order to reduce hot soakback. - View Dependent Claims (20)
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Specification