aircraft jet engine
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aircraft jet engine

aircraft jet engine

aircraft jet engine - Engine, creates the need for moving the thrust by converting internal energy into kinetic energy of the jet of the working substance.

For all jets in common the fact that during the combustion process and subsequent conversion of potential energy into kinetic energy of the combustion products gas stream is accelerated, and thus occurs traction. Traction force (kg) is the main characteristic of the engine.

Jet engines are divided into three groups:

  • Liquid
  • powder
  • jet

For work liquid propellant engines It does not require oxygen in the air. The engine may operate in a severely rarefied atmosphere. For combustion of the fuel supply must be provided oxidant. Most known combinations - the fuel-oxidant: and an alcohol oxygen, hydrogen, and oxygen gas and nitric acid, and hydrogen fluoride, and oxygen and diborane t. D.

As fuel in propellant rocket engines used gunpowder.

В air-jet engines It uses the oxygen in the air. The fuel kerosene and acts very rarely - another type of liquid fuel.

Jet engine, in turn, classified in two ways:

  1. beskompressornye (direct-flow, pulsating)
  2. Compressor

In the first case, the compressed air is due to the velocity head in the second - at the expense of the compressor or motor compressors.

In direct-flow jet engines, atmospheric air enters the inlet, while the air velocity decreases to 0, the pressure p increases, and the temperature t also increases. Under high pressure, the air enters the combustion chamber, where fuel simultaneously flows through the injectors. Burning occurs continuously. Combustion products expand in jet style and are pushed into the atmosphere. A feature of the engine, in addition to its simplicity of design, is that the amount of thrust depends on the flight speed (velocity head) - thrust is proportional to the square of the flight speed.

There is also a Pulsejet.

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