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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).
The free-piston engine linear generators can be divided in 3 subsystems: [1] [2] One (or more) reaction section with a single or two opposite pistons; One (or more) linear electric generator, which is composed of a static part (the stator) and a moving part (the magnets) connected to the connection rod.
Free-piston engine; F. Free-piston linear generator; H. Humphrey pump; P. Pratt & Whitney PT1; S. Stelzer engine This page was last edited on 30 December 2013, at 15 ...
Are gas turbines "free piston" engines, or "piston free"? 173.68.56.71 21 October 2011 Piston free. The point of a free piston engine and its similarity is that it's like the core of a gas turbine (compressor, combustor and the turbine that drives the compressor), but without the power turbine.
Data from Recreational Power Engineering General characteristics Type: Three-cylinder, two-stroke, in-line, aircraft engine Bore: 76 mm (3.0 in) Stroke: 69 mm (2.7 in) Displacement: 939 cc (57.3 cu in) Length: 490 mm (19.3 in) Width: 280 mm (11.0 in) Height: 420 mm (16.5 in) Dry weight: 108 lb (49.0 kg), including electric starter and exhaust system. With optional gearbox total weight is 127 ...
Robert Huber has about 40 patents related to free-piston engines. A few examples are listed below: US2452194 (A), published 1948-10-26, Free piston machine [5] US2645213 (A), published 1953-07-14, Free piston engine having hollow pistons [6] US2943438 (A), published 1960-07-05, Improvements in free piston engine and gas turbine power plant [7]
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A camless or free-valve piston engine is an engine that has poppet valves operated by means of electromagnetic, hydraulic, or pneumatic [1] actuators instead of conventional cams. Actuators can be used to both open and close valves, or to open valves closed by springs or other means.