Question

Can anyone explain me the mechanism of external and internal engine?

Answer 1

External combustion Engines are those engines in which combustion is carried out outside the piston cylinder and the burnt gases are used to heat up a secondary working fluid such as water to raise steam and the steam generated is used as working fluid in cylinders. The work done by fluid (steam) on the pistons is used to drive the automobile.

Internal combustion Engines on the other hand are engines in which combustion of fuel is carried out in the cylinder only and the burnt gases or combustion products do the work on the piston producing work and after which they eject through exhaust valves. This is principle of modern CI and Petrol Engines.

hope it helps u!

Answer 2

For an internal combustion engine, the combustion happens inside the cylinder. In a car, gasoline (petrol) mixed with air burns inside the cylinder and pushes the piston.

For a steam engine, the burning happens outside. Water is boiled by the combustion and the hot steam is used to push the piston inside the cylinder.