Systems and methods for operating an engine are described herein. The engine is operated at low power by supplying fuel to a combustor through a first set of fuel nozzles of at least one first manifold and without supplying fuel to the combustor through a second set of fuel nozzles of at least one second manifold. An amount of fuel to at least in part fill the at least one second manifold to impede fuel coking of the second set of fuel nozzles is determined. The amount of fuel is periodically supplied to the at least one second manifold.

An aircraft including at least one turbine engine and a monitoring device associated with the turbine engine, the turbine engine being linked firstly to circuits including fluid circuits and electric circuits, and secondly to sensors for monitoring the turbine engine and the circuits, the sensors including at least one fire sensor and sensors for monitoring the fluid circuits, sensors for monitoring the electric circuits and sensors for monitoring the operation of the turbine engine, the monitoring device being linked to the sensors and including a central processing unit to generate a signal indicating the occurrence of a fire on the turbine engine only if a fire sensor and a sensor for monitoring a fluid circuit or an electric circuit or the operation of the turbine engine transmit a signal indicating an anomaly.

A method for operating a gas turbine installation with a measured compressor inlet temperature (Ti-actual) and a virtually constant turbine inlet temperature (TiTiso), wherein to provide safe operation of the gas turbine installation, an increase in a calculated exhaust gas temperature (ATK) is compensated by a reduced mass flow (m) of a flow medium flowing through a compressor of the gas turbine installation. An arrangement for operating the gas turbine installation includes a functional unit and a gas turbine installation with a compressor, a turbine, a control system for operating the method.

A thrust reverser system for a gas turbine engine includes a transcowl movable between a stowed position, a deployed position and a partially deployed position between the stowed position and the deployed position by at least one actuator. The system includes a temperature sensor and at least one resistance sensor. The thrust reverser system includes a controller, having a processor, that: outputs one or more control signals to move the transcowl to the partially deployed position; determines whether a temperature associated with the transcowl exceeds a temperature threshold; outputs one or more control signals to move the transcowl from the partially deployed position to the stowed position; determines whether the transcowl has encountered resistance; and based on the determination, outputs one or more control signals to stop a movement of the transcowl and outputs the one or more control signals to move the transcowl to the partially deployed position.

A hot gas path (HGP) component of an industrial machine includes primary and secondary cooling pathways. A body includes an internal cooling circuit carrying a cooling medium. A primary cooling pathway is spaced internally in the body and carries a primary flow of a cooling medium from an internal cooling circuit. A secondary cooling pathway is in the body and in fluid communication with an internal cooling circuit. The secondary cooling pathway is fluidly incommunicative and spaced internally from the primary cooling pathway. In response to an overheating event occurring, the secondary cooling pathway opens to allow a secondary flow of cooling medium through to the outer surface of the body and/or the primary cooling pathway. The primary flow flows in the primary cooling pathway prior to the overheating event, and the secondary flow of cooling medium does not flow until after an opening of the secondary cooling pathway.

A monitoring system includes an analytical engine system coupled to a plurality of sensors of an engine system. The analytical engine system is configured to determine a model probability distribution based on model data, determine a distance threshold value of the model probability distribution based at least in part on a threshold percentage, determine a window probability distribution based on window data sampled from the engine system, determine a fraction of the window probability distribution that is greater than the distance threshold value, and generate a lubricant alert signal when the fraction is greater than a temperature anomaly threshold. The model data includes model temperature data and model load data. The window data includes window temperature data and window load data that is based at least in part on feedback from the plurality of sensors during operation of the engine system.

A system for detecting a ruptured duct transporting a high-temperature fluid within a gas turbine engine is disclosed. In various embodiments, the system includes a rupture detection line configured to extend within a first fire zone of the gas turbine engine; one or more rupture sensing elements in electrical communication with and disposed along the rupture detection line, the one or more rupture sensing elements configured to detect a presence of a heated fluid having a heated fluid temperature less than a fire temperature; and a processor configured to monitor the one or more rupture sensing elements.

Provided is a brushless DC motor (2) including: a stator (5) around which windings are around; a magnet rotor (6) configured to rotate by a power supply to the stator; an inverter circuit (11) connected to the stator; a position detector (7) configured to detect a positional relationship between the magnet rotor and the windings; a speed instruction unit (13) configured to output, as a speed instruction signal, a voltage corresponding to a rotation speed of the magnet rotor; a duty determination unit (12) configured to determine a duty of a voltage applied to the stator, based on the speed instruction signal; a drive controller (14) configured to distribute and output a duty signal based on the positional relationship and the duty; and temperature-sensitive resistance elements (15) configured to, by increasing the resistance in response to a temperature rise, reduce the voltage given as the speed instruction signal.

A system and method for adaptively controlling a cooldown cycle of an auxiliary power unit (APU) that is operating and rotating at a rotational speed includes reducing the rotational speed of the APU to a predetermined cooldown speed magnitude that ensures combustor inlet temperature has reached a predetermined temperature value, determining, based on one or more of operational parameters of the APU, when a lean blowout of the APU is either imminent or has occurred, and when a lean blowout is imminent or has occurred, varying one or more parameters associated with the shutdown/cooldown cycle.

A recuperated gas turbine engine includes an engine core that has a compressor section, a combustor section, and a turbine section. An exhaust duct is located downstream of the turbine section for receiving a hot turbine exhaust stream from the turbine section. The exhaust duct includes a heat exchanger and a temperature-control module upstream of the heat exchanger. A first compressor bleed line portion leads into the heat exchanger, and a second compressor bleed lie portion leads into the exhaust duct upstream of the heat exchanger. A compressor return line leads from the heat exchanger into the engine core upstream of the combustor section. The compressor bleed line is operable to selectively feed compressed air to the heat exchanger, and the temperature-control module is operable to selectively modulate at least one of temperature and flow of the hot turbine exhaust stream with respect to the heat exchanger.