اقتباس:
Project Device Design and Operation
The jet engine produces propulsive thrust by expelling exhaust gases out the nozzle or conduit at the back of the engine. The exhaust gas (atmospheric air and fuel) can be expelled at near sonic speed which cuases a reaction thust that pushes the aircraft forward. This thrust is defined as the mass flow rate M value of the air multiplied by the gas exhaust speed c.
Figure 1 shows the main components of a jet engine. Air is taken in at the ram metal tube in front of the engine. The compressor pulls in the air and compresses the air into a smaller volumev like an air fan but with greater magnitudes. The diffuser section which increases in volume along the air flow path slows down the speed of the air. The with the burning of liquid fuel in atmospheric air the combustor section heats the air which reduces the density of the air. The reduced air density reduces the weight of the air and causes the hot air to by pushed toward the turbine. The air speed is then speeded up to drive the turbine. The metallic turbine operates like a windmill. The turbine converts the gas flow power into rotational motion to spin the compressor much like a wind mill does, but with faster air speeds.