A system for managing thermal transfer in at least one of an aircraft or a gas turbine engine includes a first engine system utilizing an oil for heat transfer. The oil of the first system has a temperature limit of at least about 500 F. The system additionally includes a fuel system having a deoxygenation unit for deoxygenating fuel in the fuel system, as well as a fuel-oil heat exchanger located downstream of the deoxygenation unit. The fuel-oil heat exchanger is in thermal communication with the oil in the first engine system and the fuel in the fuel system for transferring heat from the oil in the first engine system to the fuel in the fuel system.

An aircraft engine includes at least one electrical apparatus, which can be driven by a driveshaft in order to generate electrical energy. A hydrodynamic torque converter, with guide blades, which can be adjusted via a mechanism, is arranged between the driveshaft and the electrical apparatus. The guide blades are adjusted as a function of a rotational speed of the driveshaft, wherein the rotational speed of a shaft of the electrical apparatus operated as a generator can be adjusted, essentially within a predefined rotational speed range, via the adjustment of the guide blades.

A start inverter for an electric engine start scheme includes an inverter phase leg with solid-state switches and a pulse width modulator operatively connected to the solid-state switches of the inverter phase leg. The pulse width modulator provides command signals to the solid-state switches of the inverter phase leg to invert direct current into alternating current with less ripple than a start inverter with two solid-state switches per phase leg.

A hybrid-electric genset includes a direct current (DC) bus, an engine, and an electric generator configured to receive mechanical power from the engine and generate first alternating current (AC) power. The hybrid-electric genset further includes an inverter configured to convert the first AC power to DC power and output the DC power to the DC bus. The hybrid-electric genset further includes a controller configured to control the engine to increase or decrease the AC power output by the electric generator. The DC bus is configured to attach to at least one battery pack or supercapacitor. The at least one battery pack or supercapacitor is configured to maintain a nominal voltage of the DC bus approximately at a nominal battery pack voltage of the at least one battery pack.

A turbine generator system includes a doubly-fed alternating-current (AC) generator having a first poly-phase circuit (e.g., a stator circuit) and a second poly-phase circuit (e.g., a rotor circuit), a poly-phase AC-to-AC converter circuit coupled between the first and second poly-phase circuits, a poly-phase transformer having input windings coupled to the first poly-phase circuit and having output windings, and a uni-directional rectifier circuit coupled to the output windings of the poly-phase transformer and configured to convert poly-phase AC from the transformer output windings to direct current (DC).

A system for generating power includes a turbine generator for generating alternating current (AC) power and a power electronics module that provides a first signal to the turbine generator to switch an operating mode of the turbine generator from an off mode to a startup mode. The first signal is variable frequency power. The system includes a controller that provides a second signal that causes the turbine generator to switch from a normal operating mode to a coast down mode. In the startup mode, the turbine generator accelerates to a full rotational rate and in the coast down mode, the turbine generator decelerates from the full rotational rate to a stop over an interval of time. The system includes a power converter that converts rotational inertia by the turbine generator into direct current (DC) power responsive to the turbine generator operating in the coast down mode.

A system for generating power includes a turbine generator for generating alternating current (AC) power and a power electronics module that provides a first signal to the turbine generator to switch an operating mode of the turbine generator from an off mode to a startup mode. The first signal is variable frequency power. The system includes a controller that provides a second signal that causes the turbine generator to switch from a normal operating mode to a coast down mode. In the startup mode, the turbine generator accelerates to a full rotational rate and in the coast down mode, the turbine generator decelerates from the full rotational rate to a stop over an interval of time. The system includes a power converter that converts rotational inertia by the turbine generator into direct current (DC) power responsive to the turbine generator operating in the coast down mode.

A retrofit gas turbine engine includes a compressor, a combustor and a turbine. A tie shaft is connected to rotate by the turbine, and provide rotational drive into a gearbox. At least one fuel pump is connected to be driven by the gearbox. The at least one fuel pump delivers fuel downstream toward the combustor, and also has a return line. An added accessory turbine is positioned on the return line, and drives an added accessory which has been retrofit added to an existing gas turbine engine. A method is also disclosed.

An electric generator includes a turbine wheel configured to receive process gas and rotate in response to expansion of the process gas flowing into an inlet of the turbine wheel and out of the outlet of the turbine wheel, a rotor coupled to the turbine wheel and configured to rotate with the turbine wheel, and a stationary stator, the electric generator to generate an alternating current upon rotation of the rotor within the stator. The electric generator can supply power to a power grid. During a low voltage event, current from the electric generator can be diverted to a brake resistor assembly. The brake resistor assembly can include a brake resistor designed to allow the electric generator to operate during the low-voltage event.

Various embodiments that pertain to fuel processing are described. A fuel processor can produce an endothermic reaction that cools a substance and produces a processed fuel from a raw fuel. A generator can employ the processed fuel to produce an electricity. The generator can supply the electricity to a load that uses the electricity to function. The load can become hot due to its functioning and can benefit from being cooled. The substance cooled by the fuel processor can cool load and in the process the substance can rise in temperature. This warmer substance can be transferred to the fuel processor to be cooled again and this cycle can continue. Further, the fuel processor can use the warmer substance to achieve the endothermic reaction.