Abstract: An environmental control system includes a turbomachine and an air cycle machine that is driven by shaft power of the turbomachine. The turbomachine includes a compressor, which supplies compressed bleed air to the air cycle machine. Ambient air is compressed by the compressor, and heat of compression is removed by an air-to-air heat exchanger, which envelops the turbomachine. The cooled, compressed air is expanded in the air cycle machine to produce a stream of cooled, conditioned air. Ambient air used by the air-to-air heat exchanger to cool the compressed bleed air is drawn into the turbomachine's exhaust by an eductor.

Abstract: A power generating system, including a first shaft, a first compressor, a second compressor and a turbine. In a further embodiment, the system also includes a second turbine, a second shaft and a generator. Each of the first compressor, the second compressor and the turbine are connected to the first shaft whereby the first shaft, the first compressor, the second compressor and the turbine all rotate at the same speed. The first compressor and second compressor are of disparate flow types.

Abstract: A microturbine power generation system includes an electrical generator, a turbine and a compressor intermediate the generator and the turbine. The turbine, compressor and electrical generator are secured together by a tieshaft. The tieshaft is prestressed such that faces of the turbine, electrical generator and compressor maintain contact during high-speed, high-temperature operation of the system.

Abstract: A hybrid electrical power system includes a solid oxide fuel cell and a turbomachine. Fuel flow to the turbomachine is increased in response to demands for boost power, whereby the turbomachine's electrical generator provides the boost power. The turbomachine supplies heated, high pressure air to the solid oxide fuel cell, bringing the solid oxide fuel cell to its required operating temperature. Waste from the solid oxide fuel cell, including exhaust air and unreacted fuel, is utilized by the turbomachine.