jet engines have been the successful drivers of aircrafts for nearly a century now in
This video we will explain the technology behind the jet engine in a logical step-By-step Manner
a jet engine keeps an aircraft moving forward using a very simple principle
The same that makes an air-filled balloon move
Yes, Newton's third law of [motion] just
[like] the reaction Force produced by the Air moves the balloon
The reaction Force produced by the high speed jet at the tail of the jet engine makes it move forward
so the working of jet engine is all about producing a
High-speed jet [at] the exit the higher the speed of the jet the greater the thrust force
The thrust force makes an aircraft move forward
Such high-speed exhaust is achieved by a combination of techniques
If you can heat the incoming air to a high temperature it will expand tremendously and will create the high velocity [jet]
For this purpose a combustion chamber is used
An atomized form of the fuel is burnt in the combustion chamber
effective combustion requires air to be at moderately high temperature and pressure
To bring the air to this condition a set of compressor stages are used
The rotating blades of the compressor add energy to the fluid and its temperature and pressure rise to a level suitable to sustain combustion
The compressor receives the energy for the rotation from a turbine which is placed right after the combustion chamber?
The compressor and turbine are attached to the same shaft
The High-energy fluid that leaves the chamber makes the turbine blades turn
You can see that the turbine blades have a special airfoil shape which creates lift force and make them turn
As the turbine absorbs energy from the fluid [its] pressure drops
Through these steps we have achieved our objective a really hot and high-speed air emitted from the exit of the engine
the engine case becomes narrower towards the outlet which results in even greater jet velocity
In short the synchronized operation of the compressor combustion chamber and turbine makes the aircraft move forward
Modern aircrafts use a slightly [improved] compressor turbine arrangement called a [two] spool
Here two independent turbine compressor stages are used
the shaft of the outer compressor turbine passes concentric [LI] through the inner one
The outer turbine is subjected to a low energy fluid and will run at a lower speed than the inner turbine
Low pressure blades are longer this [low-speed] helps to reduce centrifugal stress induced at the root Thus improving the blades life
Some modern aircrafts even use a three spool engine
The engine we have discussed so far is more specifically called as turbo jet engine
Turbo jet engines tend to Produce high levels of noise [A]
Revolutionary Improvement was made to this engine by fitting a large fan with the low pressure spool
such engines are called Turbofan engines and almost every commercial aircraft run on them a
Turbofan engine bypass is a huge amount of air
The ever narrowing bypass duct provides a good jet velocity to the bypassed air
in a turbofan engine the majority of the thrust force comes from the fans reaction force
further the fan greatly improves Airflow in the system by sucking in more air
Thus it helps to improve the thrust
This means high thrust creation with an expense of slightly more fuel
This is [the] reason why Turbofan engines are highly fuel economical
The noise produced by a jet engine is highly dependent on the exit jet velocity
Since in a turbofan the bypassed cold air gets mixed with the hot air it is possible to keep the outlet velocity within a limit
Thus it overcomes the noise problem
With quieter exhaust and better fuel economy the turbofan engines continued to dominate aircraft propulsion systems
We hope this provided a nice introduction to the working of jet engines. Thank you for watching this video