Inventions
Airplanes and Aircraft
Fighter Aircraft

How do jet engines work?

404142

Top Answer
User Avatar
Wiki User
2015-10-01 21:06:52
2015-10-01 21:06:52

The simple answer is: "Suck, Squeeze, Burn and Blow." Or, more accurately, air is taken into the inlet of a jet engine (suck) and then compressed (squeeze) by a series of rotors and stators. A fuel mixture is then injected into a chamber with the compressed air and ignited (burn). The subsequent combustion is directed aft and the resulting exhaust (blow) pushes the engine (and vehicle) forward. The exhaust gasses also turn a shaft connected to the inlet turbine which continues the compression process. It's really a lot more complicated than this, but this is the quick and dirty of how it works.

A modern jet engine is made up of several rows of spinning propeller blades called Rotors. As the airflow goes through each row, the air is accelerated and compressed. Behind the row is another set of blades that are not really turning---but attached to the out housing. These are called Stators. These help to re-direct the flow to be more efficient and prepare it to meet the next set of spinning blades. After going through several rows of Rotors, the air is compressed. This stage of the engine is called the Compressor.

The compressed gas enters a Combustion Chamber where fuel is added an a spark ignites the fuel/air mixture and this flame is self-sustaining. The hot gases want to expand and it passes through another set of Rotors and Stators that extract some energy out of the fast flowing air gases. This section of the engine is the Turbine stage because it acts like the turbines in a dam to pull energy out of flowing fluid. This engergy is used to turn the Turbine disc that is connected back to the Compressor stage, thus compressing the next amount of air entering the engine.

The gas escaping the engine has a great amount of energy and velocity and applies thrust to the engine and thus to the airplane.

Hi bypass commercial jets (Trent 900, GEnx) use outer guide vanes or OGV's to rotate and eject air before the compressor stage. The air rotates around the exhaust to reduce friction of exhaust gases increasing efficiency and reducing noise.

The steps in a jet engine are essentially the same as in a car engine: Intake, Compression, Combustion, Exhaust.

In modern jet engines, the air is pulled into the engine by a large disc of spinning blades called the fan. This is what you see if you look into the front [intake] of the engine. Behind the fan is the bypass duct [mentioned later] and the engine core.

The engine core contains more spinning components similar to the fan called 'compressors' that simply compress the air into a smaller area.

Behind the compressors is the combustion chamber, where the air is sprayed with jet fuel from a nozzle and ignited by a flame.

It then passes through one more spinning component called the turbine, which accelerates the air out the back of the engine. That turbine is connected to the compressors by a shaft running through the center of the engine and is what runs them.

The bypass duct [mentioned earlier] is simply a hollow area surrounding the engine core. Some of the air that gets taken in is routed by the fan through the bypass duct so that it totally bypasses the engine core, and mixes with the exhaust behind the engine. This makes the engine more efficient and muffles the sound of the exhaust, making the engine quieter. A better understanding of thrust

A common misconception about thrust is that the exhaust gasses expelled from the rear of the engine cause the engine and the attached aircraft to move forward. This is not true.

Although the expelled gasses do add a minimal amount of forward thrust, the majority of thrust created by the engine is from the aerodynamic forces generated by the aforementioned Rotors.We must first understand that Rotors are aerodynamic devices known as Airfoils because of their designed curvature. An Airfoil that passes through a body of air will cause a pressure differential that causes lift. The wings of an aircraft are examples of an airfoil, and as air passes around the wings, the curvature that engineers design into the wing will cause a higher pressure to act upon the underside of the wing, and a lower pressure to act upon the upper surface of the wing. As this pressure differential becomes greater, it eventually overcomes the combined forces of gravity and the mass of the aircraft, and the aircraft flies. This same principle can be used to explain why the Rotors are the primary source of forward thrust. As the rotors spin, they too will develop pressure differentials, but because they are mounted vertically like a propeller on a small plane, they will produce forward thrust, instead of creating upward lift as we are used to associating with horizontally mounted aircraft wings. NASA explanation of thrust See the the discussion page for more information.

1
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0

Related Questions

User Avatar

jet engines require air, compression, and combustion to make it work

User Avatar

me i think they work very nice.

User Avatar

no jet engines use air intakes which are not possible in large enough quantities in space

User Avatar

The jet engines used jet fuel, not gasoline as the 6 main engines did.

User Avatar

It depends on whether it is a piston or jet (turbine) engine.

User Avatar

An aircraft propelled by jet engines rather than piston engines.

User Avatar

A pulse jet engine is one of the most simple and efficient propulsion devices ever designed. There are three types of pulse jet engines: The valved pulse jet, the valveless pulse jet, and the upright or "Jam jar jet". For complete details on pulse jet engines, go to wikipedia.org and search "Pulse Jet Engine".

User Avatar

because jet engines reqire air to take in in order to work, rocket engines spew matter to privide thrust

User Avatar

Many factories in Britain make jet engines.

User Avatar

A jet is a type of engine on an airplane. Some airplanes have propellers - those without propellers have jet engines. Airplanes with jet engines are faster than airplanes with propellers. Often airplanes with jet engines are referred to as "jets."

User Avatar

A jet plane is any aircraft powered by jet engines.

User Avatar

yes they are, they are the engines you see on a 747 or even a small Private jet

User Avatar

It is the height, width and length of a jet engine.

User Avatar

Jet engines use the oxygen in the air to get the fuel to burn. In space there's no oxygen, so a jet engine would simply go out. Space rockets carry both their fuel and their oxygen, which allows them to work in the vacuum of space.

User Avatar

None. Jet engines don't have cylinders. While Jet engines don't have cylinders they have combustors (which can also be called combustion chambers). Due to turbulence and other problems early jet engines had multiple small combustors, most modern jet engines have only one large combustor as it is simpler to build. some jets have combustion 'cans' which are cylinders but have no moving parts within

User Avatar

It isn't a matter of why they need it! Some planes are just designed with jet engines! Jet engines take a small amount of air and push it out fast whereas props take a large amount of air and push it back slower! Some planes just have jet engines!

User Avatar

No they're not safe. Jet engines are very dangerous and extremely powerful. They can take your whole body if you get to close. Don't get so close if the aircraft engines are on.

User Avatar

There is no actual answer, because a jet is called a jet because it has at least one jet engine.

User Avatar

For the most part, jet engine aircraft mostly have 2 jet engines such as the a319, 737 and private jets such as lears and gulfstreams. However, this is purely dependent on the type of aircraft it is. Some aircraft, such as the 747, a340 and a380 have 4 jet engines.

User Avatar

Jet planes fly with the help of Thrust and Lift produced by the jet engines.

User Avatar

Pulse jet is used to power experimental helicopters, it work by attaching the engines to the extreme ends of the rotor blades. As an aircraft propulsion system, pulse-jets have the distinct advantage over conventional turbine engines by not producing the usual reaction torque upon the fuselage.

User Avatar

Pretty much the same. Most jet engines contain very little chromium

User Avatar

I think they are jet aircraft although they have turbofan engines. You can check more on thee link below

User Avatar

jet engines, turbojet engines, turbo-prop engines, four-stroke piston driven engines... Can you be more specific?

User Avatar

Jet powered aircraft have a number of advantages over conventional internal combustion propeller driven aircraft. To start with, jet engines can operate in a much wider range of conditions. Propellers lose their effectiveness at high altitudes and at high speeds while jet engines are capable of operating at much higher altitudes and a much much higher speeds with little or no loss of power. Jet engines have fewer moving parts than internal combustion engines which makes them easier and simpler to design, build, maintain and repair. Jet engines run on fuel that is very similar to diesel fuel, and is much safer to handle and store than gasoline. Jet engines can produce much more thrust power for their weight than conventional reciprocating engines do.


Copyright ยฉ 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.