Can anyone tell me any very technical information about aircraft turbofan jet engines?? Thanks?

Answer 1

turbofans are jet engines that have multiple fans, they suck in alot of air and are bleedless, meaning that they dont loose any air for the planes air-conditioning. They also propel the hot gases alot more pressure. This increases performance, Yet It only works 75-80% in the impelling shaft, The ait velocity also turns the blades. This means it uses less energy, burns less fuel, and is alot quietes than a conventinal jet

Answer 2

Basically Speaking, a turbofan is a type of airplane engine, similar to a turbojet. It essentially consists of a ducted fan with a smaller diameter turbojet engine mounted behind it that powers the fan. Part of the airstream from the ducted fan passes through the turbojet where it is burnt to power the fan, but the majority of the flow bypasses it, and produces most of the thrust.

Turbofans are of 3 types:
Low bypass Turbofans,
Afterburner Turbofans, and
High Bypass Turbofans.

Low Bypassratio or High specific thrust ratio Turbofans have multi-staged fans which develop a relatively high pressure ratio and thus yielding a high exhaust velocity.This engine was the heart of the famous F-14 Tomcat.

Afterburning Turbofans
These kind of engines possess a low\medium bypass ratio.
An afterburner is a combustor located directly upstream of the nozzle. When lit, prodigious amounts of fuel are burnt in the afterburner, raising the temperature of exhaust gases by a significant amount, resulting in a higher exhaust velocity/engine specific thrust.
Afterburning gives a significant thrust boost for take off, transonic acceleration and combat maneuvers, but is very fuel intensive. Consequently afterburning can only be selected for relatively short proportion of the mission.

High bypass turbofans
These engines possess a low specific thrust\high bypass ratio.
Low specific thrust is achieved by replacing the multi-stage fan with a single stage unit. Unlike some military engines, modern civil turbofans do not have any stationary inlet guide vanes in front of the fan rotor. The fan is scaled to achieve the desired net thrust.
Theseengines are mainly used in todays civil airliners and military transport aircraft.

Answer 3

The standard "pure jet" engine has a turbine which drives a impeller on the front. All the air from the impeller goes through the turbine and out the rear. What drives the plane is the velocity of the gasses going out of the back of the engine.

On a turbofan, up to 80 percent of the air from the impeller bypasses the turbine and goes around the outside of the motor.
The plane is driven by this bypass air in addition to the gasses going out of the back of the engine.

You can recognize the turbofans because they are much larger in diameter than the "pure jet" engines.

Turbofans are more fuel efficient and quieter than standard jets.

Answer 4

A turbojet engine is low-bypass, which means very little air is bypassed around the engine. It all goes through the core and combusted. A torbofan engine is more modern. It bypasses much of the air it intakes. On a KC-135R, 80% of the thrust produced by the engine comes from this bypass air. It is basically like a big turboprop because the first stage compressor is 68" in diameter, but the second stage compressor is half of that size.

Answer 5

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