What does the fan do in a turbofan?

The word “turbofan” is a portmanteau of “turbine” and “fan”: the turbo portion refers to a gas turbine engine which achieves mechanical energy from combustion, and the fan, a ducted fan that uses the mechanical energy from the gas turbine to force air rearwards.

How does a turbofan compressor work?

How does a turbofan engine work? The incoming air is captured by the engine inlet. Some of the incoming air passes through the fan and continues on into the core compressor and then the burner, where it is mixed with fuel and combustion occurs. This means that a turbofan is very fuel efficient.

How does the fan rotate in a jet engine?

The turbines are linked by a shaft to turn the blades in the compressor and to spin the intake fan at the front. This rotation takes some energy from the high-energy flow that is used to drive the fan and the compressor. The gases produced in the combustion chamber move through the turbine and spin its blades.

How does an afterburner work?

A jet engine, like a rocket engine, is a reaction engine. The idea behind an afterburner is to inject fuel directly into the exhaust stream and burn it using this remaining oxygen. This heats and expands the exhaust gases further, and can increase the thrust of a jet engine by 50\% or more.

How does turbofan produce thrust?

The hot exhaust passes through the core and fan turbines and then out the nozzle, as in a basic turbojet. Because the fuel flow rate for the core is changed only a small amount by the addition of the fan, a turbofan generates more thrust for nearly the same amount of fuel used by the core.

How do turbofan engines start?

The passing air spins the turbines, which then drive a shaft connected to the fan and compressor blades, spinning them. So to start a turbofan engine, you need to spin the compressor fast enough to start pushing compressed air into the diffuser and combustion chamber.

How much air does a jet engine move?

A typical commercial jet engine takes in 1.2 tons of air per second during takeoff—in other words, it could empty the air in a squash court in less than a second. The mechanism by which a jet engine sucks in the air is largely a part of the compression stage.

Can a turbofan have afterburner?

Afterburners offer a mechanically simple way to augment thrust and are used on both turbojets and turbofans. The mathematics describing the thrust of an afterburning turbojet is given on a separate slide.

What is the function of the compressor in a turbofan engine?

The compressor plays an important role in the working of the turbofan engine. The main objective of the compressor is to increase the pressure and temperature of the air. A turbofan engine uses two compressors (low-pressure compressor and high-pressure compressor) for air compression.

What is bypass ratio in turbofan engines?

The intake stage of the turbofan engine feeds the compressor of the engine with cold air. Some air flows through inlets of the engine and some air flows around the outside of the engine, this air is said to be bypassed, because it doesn’t go into the engine. The ratio of the inlet air and the bypassed air is usually referred to as bypass ratio.

Where does a turbofan engine get its thrust from?

So a turbofan gets some of its thrust from the core and some of its thrust from the fan. The ratio of the air that goes around the engine to the air that goes through the core is called the bypass ratio .

What is a Fanjet or turbofan engine?

The fanjet or turbofan engine is a famous kind of engine from the category of jet engine. A turbofan engine is most commonly utilized in aircraft propulsions. The turbofan has an additional fan which helps to accelerate a lot of mass without combusting extra fuel.