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A pneumatic motor (air motor), or compressed-air engine, is a type of motor which does mechanical work by expanding compressed air. Pneumatic motors generally convert the compressed-air energy to mechanical work through either linear or rotary motion. Linear motion can come from either a diaphragm or piston actuator, while rotary motion is ...
The compressed air is channeled through the combustors, where it is mixed with fuel and burned, and the resulting combustion gases are expanded through first the gasifier turbine, which is on the same shaft and is used to drive the rotary compressor, then through the power turbine, which is on the output shaft. [1]: 43–44
Compressed air has a low energy density, however near-isothermal compressed air storage ICAES can reach 3.6 MJ/m 3 and has almost four times the energy density of lithium-ion batteries with 2.7 MJ/kg. [1] Compressed air can be produced by attaching an air compressor or hydraulic pump to a wind turbine [10] [11] or using river, tidal, wave ...
Compressed air engines reduce the cost of car production, because there is no need to build a cooling system, spark plugs, starter motor, or mufflers. The rate of self-discharge is very low compared to batteries. A fueled, compressed-air vehicle may be left unused for a longer time than an electric car.
The air compressed by the compressor bypasses the combustor and turbine section of the engine, where it is mixed with the turbine exhaust. The turbine exhaust can be designed to be fuel-rich (i.e., the combustor does not burn all the fuel) which, when mixed with the compressed air, creates a hot fuel-air mixture which is ready to burn again.
The compressed air is heated in the combustor and passes through the turbine, then expands in the nozzle to produce a high speed propelling jet [3] Turbojets have a low propulsive efficiency below about Mach 2 [ citation needed ] and produce a lot of jet noise, both a result of the very high velocity of the exhaust.
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It is common to bleed air from a compressor to make it work properly at low engine speeds. The PT6 has a bleed arrangement which reuses the bleed air by returning it in a tangential direction at the entry to the compressor, an idea patented by Schaum et al. and titled "Turbine Engine With Induced Pre-Swirl at Compressor Inlet". [19]