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2. Variable-speed air compressor - Wikipedia

   en.wikipedia.org/wiki/Variable-speed_air_compressor

   For example, 10–12% of all power generated in the UK is dedicated to the production of compressed air and a portion of this power is wasted energy. Large electrical cost savings can be achieved by installing a variable speed drive compressor in place of an existing rotary screw or piston machine.

3. Napier Nomad - Wikipedia

   en.wikipedia.org/wiki/Napier_Nomad

   At the Steven F. Udvar-Hazy Center Napier Nomad 1. In 1945 the Air Ministry asked for proposals for a new 6,000 hp (4.5 MW) class engine with good fuel economy. Curtiss-Wright was designing an engine of this sort of power known as the turbo-compound engine, but Sir Harry Ricardo, one of Britain's great engine designers, suggested that the most economical combination would be a similar design ...

4. Compressor map - Wikipedia

   en.wikipedia.org/wiki/Compressor_map

   These effects are caused by the sluggish response of the spool (i.e. inertia effects) to rapid changes in engine fuel flow. Compressor surge is a particular problem during slam-accelerations and can be overcome by suitable adjustments to the fueling schedule and/or use of blow-off (bleeding air off the compressor, for handling purposes).

5. Free-piston engine - Wikipedia

   en.wikipedia.org/wiki/Free-piston_engine

   Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).

6. Pneumatic motor - Wikipedia

   en.wikipedia.org/wiki/Pneumatic_motor

   Piston motors are often used in series of two, three, four, five, or six cylinders that are enclosed in a housing. This allows for more power to be delivered by the pistons because several motors are in sync with each other at certain times of their cycle. The practical mechanical efficiencies attained by a piston air motor are between 40–50% ...

7. Reciprocating compressor - Wikipedia

   en.wikipedia.org/wiki/Reciprocating_compressor

   A reciprocating compressor or piston compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure. [ 1 ] [ 2 ] Pressures of up to 5,000 psig are commonly produced by multistage reciprocating compressors.