The document discusses jet propulsion and jet engines. It provides a brief history of jet engines, noting the first jet engine was built by Egyptian scientists in 100 BC. It then describes the major components of a jet engine, including the fan, compressor, combustor, turbine, mixer, and nozzle. The document explains how a jet engine works, from air intake into the compressor to combustion and exhaust through the turbine and nozzle. It also outlines different types of jet engines, such as ramjet, turbojet, turbofan, turboprop, and turboshaft, providing some key details about each.

1. Knowledge Institute Of Technology,
Salem- 504
JET PROPULSION
Presented by: S.Boopalan
Mechanical Engineering
Roll.No:45
Reg:611216114305

2. Contents
• History
• Introduction
• Major components
• Working
• Types of Jet engines
• Applications

3. • The first jet engine was built by
Egyptian scientists during 100 B.C
• This device was known as Aeolipile.
• It is also called as the Hero’s Engine
or gasturbine.

4. Introduction
• Jet engine is nothing but a Gas turbine.
• It works under the principle of Newton’s third law.
• It states that “For every acting force there is an equal
and opposite force”.
• Gas turbine operates like toy balloon.

5.  FAN
 COMPRESSOR
 COMBUSTOR
 TURBINE
 MIXER
 NOZZLE
Parts of Jet Engine

6. How A Jet Engine Works ?
• Jet engines move the airplane forward with a great force that is
produced by a tremendous thrust and causes the plane to fly very fast.

7. 1.Air Intake
 Sucked in by the compressor
2.Compressor
 Series of vanes and stators.
 The vanes rotate, while the stator remains stationary.
 Compressor speed and temperature increases
gradually.

8. 3.Fuel Burner
 Fuel is mixed with the air, and electric sparks light the air,causing
it to combust.
4.Combustion Chamber
 The air is burnt Increase in the temperature ofthe air,thus
increases the pressure inside the engine

9. 5.Turbine
 Works like a windmill.
 The blades gain energy from the hot gases moving past them.
 Imovement is used to power the Compressor.
6.Jet Pipe and Propelling Nozzle
 The hot air rushes out of the nozzle
 High pressure
 Hot air rushes out at very high speed

10. Types Of Jet Engines
 Ramjet
 Turbojet
 Turbofan
 Turboprop
 Turbo shaft

11. Ramjet
 It has no moving parts.
 Its compression ratio depends on
forward speed.
 It has no static thrust.
 Guided-missile systems, Space
vehicles use this type of jet.

12. Turbojet
 The turbojet engine is a reaction
Engine.
 Substantial increases in thrust can be
obtained by employing an after burner.

13. Turbofan
 The objective of this sort of bypass
system is to increase thrust.
without increasing fuecl onsumption.
 It achieves this by increasing the
total air-mass flow and reducing the
velocity within the same total
energy supply.
 75% of thrust is produced by the
fan.

14. A Turbofan Aircraft Engine:

15. Turboprop
 A turboprop engine is a jet engine attached to a
propeller.
 Modern turboprop engines are equipped with
propellers that have a smaller diameter but a
larger number of blades for efficient operation at
much higher flight speeds.