Thursday, May 7, 2009

Compressed-air engine

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(Redirected from Air engine)
A Compressed-air engine is a Pneumatic actuator that creates useful work by expanding compressed air. They have existed in many forms over the past two centuries, ranging in size from hand held turbines up to several hundred horsepower. Some types rely on pistons and cylinders, others use turbines. Many compressed air engines improve their performance by heating the incoming air, or the engine itself. Some took this a stage further and burned fuel in the cylinder or turbine, forming a type of internal combustion engine.
1 Tools
2 Torpedoes
3 Railways
4 Aircraft
5 Automotive
5.1 Energine
5.2 EngineAir
5.3 K'Airmobiles
5.4 MDI
5.5 Quasiturbine
5.6 Regusci
5.7 Team Psycho-Active
6 Karts
7 Efficient air engines
8 See also
9 External links
10 References
Impact wrenches, drills, die grinders, dental drills and other pneumatic tools use a variety of air engines or motors. These include vane type pumps, turbines and pistons.
Most successful early forms of self propelled torpedoes used high pressure compressed air, although this was superseded by internal or external combustion engines, steam engines, or electric motors.
Compressed air engines were used in trams and shunters, and eventually found a successful niche in mining locomotives, although eventually they were replaced by electric trains, underground[1]. Over the years designs increased in complexity, resulting in a triple expansion engine with air to air reheaters between each stage [2].
Transport category airplanes, such as commercial airliners, use compressed air starters to start the main engines. The air is supplied by the load compressor of the aircraft's auxiliary power unit, or by ground equipment.
Main article: Compressed air vehicle
There is currently some interest in developing air cars. Several engines have been proposed for these, although none have demonstrated the performance and long life needed for personal transport.
The Energine Corporation is a South Korean company that delivers fully-assembled cars running on a hybrid compressed air and electric engine. The compressed-air engine is used to activate an alternator, which extends the autonomous operating capacity of the car.
EngineAir, an Australian company, is making a rotary engine powered by compressed air, called The Di Pietro motor. The Di Pietro motor concept is based on a rotary piston. Different from existing rotary engines, the Di Pietro motor uses a simple cylindrical rotary piston (shaft driver) which rolls, with little friction, inside the cylindrical stator. [3]
It can be used in boat, cars, carriers and other vehicles. Only 1 psi (? 6,8 kPa) of pressure is needed to overcome the friction. [4] [5]
K'Airmobiles vehicles use a compressed-air engine known as the K'Air, developed in France by a small group of researchers
These engines have a consumption of compressed air of less than 120 L/min., although developing a dynamic push able to reach 4kN.
The technical concept of the K'Air pneumatic engines returns to direct conversion of what makes the fundamental characteristic of compressed air, namely:
the pushing force of compressed air is exclusively exploited for conversion into kinetic energy of translation,
itself is simultaneously converted into induced power of rotation of the axis and
thus gives to the engine a particularly imposing torque while needing only a very low uel consumption.
To simplify, one can compare the principle to that of the rotary jacks:
the energy of the fluid (compressed air) is directly transformed into rotational movement;
the double-acting jacks involve a pinion-toothed rack system;
the cyclic angle of rotation can vary between 90 and 360;
it supports hydraulic supercharging systems.
Main article: Motor Development International
In the original Nre air engine, one piston compresses air from the atmosphere to mix with the stored compressed air (which will cool drastically as it expands). This mixture drives the second piston, providing the actual engine power. MDI's engine works with constant torque, and the only way to change the torque to the wheels is to use a pulley transmission of constant variation, losing some efficiency. When vehicle is stopped, MDI's engine had to be on and working, losing energy. In 2001-2004 MDI switched to a design similar to that described in Regusci's patents (see below), which date back to 1990[6].
Main article: Quasiturbine
The Pneumatic Quasiturbine engine is a compressed air pistonless rotary engine using a rhomboidal-shaped...(and so on) To get More information , you can visit some products about aviation training center, Bluetooth Phone Tools, . The Quilt, Comforter,Bedding Set, products should be show more here!

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