Question: How do you make a jet engine?

Ivan Merrick answered on 11 Mar 2019:

Thousands. The most widely used jet engine in commercial aircraft is the turbofan engine. It essentially is the same as a hairdrier you have at home but far more complicated. When you turn on your hairdrier a fan at the back turns very fast drawing air into the drier. In the middle you have an electric heater warming up the air. At the front is the nozzle when the heated air is blown out due to the air being compressed inside the drier. So if you look at the back of a hair drier where the air goes in you have an example of how as a jet engine works.
Here, very simply, is how a jet engine works. At the front is a series of spinning fan blades which you can see when you look at aircraft parked at the airport. This is the first of many rows of fans which are behind the front ones and go deep into the engine. They are designed to draw air into the engine and in doing so they compress (squeeze) the air to high pressure. The air goes deeper into the engine to the combustion chamber where fuel is added and ignited. This causes an explosion releasing huge amounts energy in the chamber and causes the air to be further compressed and expelled out the back of the engine pushing the aircraft forward. There are more rows of fan blades at the back of the engine which are spun by the air exhausting from the combustion chamber. All the rows of fan blades at the front and back of the engine are connected. so the blades at the back help turn the blades at the front and help draw more air into the engine. The pilot controls the speed of the engine using a throttle, just like a car. If he want the engine to go faster he pushes the throttle forward and pulls it back to slow down.
There are some excellent videos on YouTube showing how a jet engine works. Look them up too.