answersLogoWhite

0


Best Answer

A turbojet is one of the oldest kinds of jet engine designs. The air flow enters the jet engine at one end and is compressed while it travels through rows of rotating blades (called compressors; sometimes referred to as stages). It is then ignited in the combustion chamber and as the gas expands and speeds up, it causes the turbine blades to turn, which provides the torque to the compressor stages. The force of the exhaust gases exiting is what provides the forward motion of the engine and is referred to as thrust.

A turbofan jet engine is the most widely used jet engine on modern aircraft today. It uses a fan placed directly in front of a series of compressors to compress the air. The operation is similar to the turbojet engine, except not all of the air moved by the fan goes into the engine's combustion chamber. A portion of the air flows over the engine itself, called bypass air. Bypass air also produces thrust in conjunction with the exhaust gas pressure.

Turbofan engines come in two varieties: high bypass and low bypass.

With high bypass turbofans, the majority of the total engine thrust (as much as 80%) is produced by the bypass air. With low bypass turbofans, the majority of the thrust is produced by the exhaust gases. Large commercial airliners (such as the Boeing 747 Jumbo Jet), large military cargo jets (such as the Lockheed-Martin C-5 Galaxy) and some small military tactical fighters jets (such as the Fairchild-Republic A-10 Thunderbolt II) use high bypass turbofans because they offer better subsonic efficiency at low to medium altitudes, are quieter, and still offer strong thrust at the cost of supersonic capabilities.

Low bypass turbofans are popular on small, high-performance tactical fighter aircraft (such as the Lockheed-Martin F-22A Raptor) and sacrifice fuel efficiency for improvements in the following areas: high altitude performance, supersonic performance, supersonic efficiency, and afterburning fuel economy. In afterburning engines, fuel is sprayed into the exhaust stream and produces the famous flame trail that jet engines are known for. Activating the afterburner can increase thrust output by as much as 50%.

Turbofans as a whole offer better efficiency than turbojets at high sub and transonic speeds, and at low supersonic speeds with little sacrifice in thrust performance.

User Avatar

Wiki User

7y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What is the difference between a turbofan and turbo jet engine?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What is the difference between TDI engine and TSI engine?

1 is a turbo diesel and 1 is a turbo sport


How can you tell the difference between a turbo and non turbo 300zx ENGINE from the VIN number?

VG30DETT is Twin Turbo VG30DE Non turbo


What is the difference between tfsi and tsi engine?

TSi = turbo supercharge and TFS1= turbo fuel stratefied injection


Is there any difference between piston ring of naturally aspirated engine and turbo charge engine?

yes


What is the difference between marine turbo engine and marine engine?

the difference is that one is turbocharged and one isnt,but both are marine engines. Keep in mind,there is a difference between marine and non-marine engines.


Is there any difference between piston rings of naturally aspirated engine and turbo charge engine?

YES!!!!! As well as the pistons!


What is the difference between turbo and twin turbo?

Turbo = 1 turbo, Twin Turbo = 2 turbos


Difference between turbo diesel and diesel turbo?

none


What is difference between turbo non turbo engine?

As an engine turns it sucks air in, which draws fuel with it. In a turbo engine a fan (turbocharger) forces more air into the engine, which draws fuel with it. The more fuel and air that goes into the engine the more power is produced. A turbocharged engine can produce perhaps double the power that a non turbocharged engine produces.


What is the difference between Toyota hilux kun25r-prmdhns and kun26r-prmsyn?

KUN25R has the 2.5 litre turbo diesel 2KD-FTV engine KUN26R has the 3.0 litre turbo diesel 1KD-FTV engine


Difference between twin turbo and bi turbo?

twin = two bi = two Answer: no difference


Which engine is more efficient in jet engines. Turbo jet or the Turbo fan?

The term "Turbofan" is actually quite broad, but can be broken down into two categories…high and low bypass. The question you are really trying to ask is which engine type (high bypass or low bypass) turbofan engine is more efficient? High bypass engines are used on most commercial airplanes (except the Concord) and these engines are favorable because they have a balance of high thrust, and efficiency. Aircraft that need supersonic capabilities (like the Concord) use a low bypass turbofan engine. These engines produce the thrust required to propel a plane beyond the speed of sound, but at the cost of efficiency. They burn a lot of fuel in doing so. So one could draw the conclusion that high bypass turbofan engines are more efficient, but this would not be true. In order to propel a plane beyond the speed of sound the low bypass turbofan engine is the most efficient way of doing so. On the flipside, the high bypass turbofan engine is most efficient for practical air travel. Both engine types are very different, but each are specialized to achieve different goals.