JET ENGINES

History Of Jet Engines:- The jet engine was built by

Egyptian scientists during 150 B.C.

This device was know as Aeolipile.

Dr. Hans von Ohain and Sir Frank Whittle were the main developers.

Aeolipile:-

Introduction:- Jet engine is a reaction engine discharging a

fast moving jet that generates thrust by jet propulsion in accordance with Newton’s third law of motion.

Jet engine moves the airplane forward with a great force that is produced by a tremendous thrust and causes the plane to fly very fast.

Parts Of Jet Engine:- FAN

COMPRESSOR

COMBUSTOR

TURBINE

MIXER

NOZZLE

Working of Jet Engine:- The Engine takes a large volume of air.

The Air is heated, compressed and slowed down.

The Air is forced through many spinning blades.

By mixing this air with jet fuel, the temperature of air reach up to 3000 degrees. The power of air is used to turn the turbines.

Finally, when the air leaves, it pushes backward out of the engine.

This causes the plane to move forward.

1. Ramjet

2. Turbojet

3. Turbofan

4. Turboprop

5. Turbo shaft

Types of Jet Engines:-

Ramjet:- It is the most simple jet Engine.

It has no moving parts.

It develops no static thrust.

It requires another aircraft to assist take off.

Use:- In Guided-missile systems, space vehicles.

Turbojet sucks in air & compress or squeezes it.

All thrust produced by hot, high-speed exhaust gases.

The gases flow through turbine & make it spin.

These gases bounce back & shoot out the rear of the exhaust, pushing plane forward.

Turbojet:-

Turbofan:- A large fan at the front,

which sucks in air.

Some portion of air goes into the combustion chamber.

Remaining air :--- Passes through a fan or Low-pressure compressor

or

Remaining air :--- (Cont.)

is ejected directly as a cold jet or

mixed with the gas- generator exhaust to produce a hot jet.

Objective of this bypass system is to increase thrust without increasing fuel consumption.

Use :- Most of today’s airlines are powered by turbofans.

It a jet engine attached to a propeller.

Working:-

The turbine at back is turned by the hot gases & this turns a shaft that drives the propeller.

Turboprop:-

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.

Some small airlines & transport aircraft are powered by turboprops.

It operates much like a turboprop system.

Instead of propeller, it provides power for a helicopter rotor.

The speed of helicopter rotor is independent of speed of gas generator.

Turbo shafts:-

This permits the rotor speed to be kept constant even when the speed of the generator is varied.

The industry they’re most prominent in is in the transport industry, where they are used to propel aircraft, boats and in some one of creations such as a turbojet powered truck.

The first use of the jet engine was to power military aircraft.

The jet engine is not only used on aircraft but on boats, where water jets are used to propel the boat forward.

Uses of Jet Engine:-

http://www.freepatentsonline.com Harris, William S.

http://www.freepatentsonline.com Jaeckel, Ernst (DE)

http:// www.google.com http:// www.boeing.com http:// www.jet engine.com

References:-

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