Jet engines :- Jet engines are internal combustion engines discharging hot exhaust gases at high velocity that generate thrust. Unlike the internal combustion engines in automobiles & trucks which convert the up & down movement of the piston to rotary movement of crankshaft, jet engines simply produces power by sucking air at the front side & discharging it at the back side. Types of jet engines/gas turbines :- Turbojet engines :- Animation of working of a jet engine. Also you could see that air is flowing faster while leaving the nozzle than while entering. These were the first jet engines. The fans in the front does the work of compressor. The compressed air is then forced into the combustion chamber. As the air is already at high pressure and high temperature, fuel is injected into it. Combustion takes place into the chamber & high amount of exhaust gases are produced. These hot expanding gases are then made to flow through turbine which causes the