what is the difference between turbofan engines and turboprop engines?

Answer 1

Turbo Prop engine will have (like the name says) a prop like a small plane would have. A turbo Fan engine has a big fan on the intake side of the motor (Think Big jet engines) If you need more information go to Howstuffworks.com and search for both turbo fan and turbo prop.

Answer 2

A turboprop is a gas turbine engine attached to a propeller. It has better propulsion efficiency at flight speeds below about 435 knots than a turbofan.

A turbofan has a large ducted fan at the front which sucks in the air through low pressure and high pressure compressors. Most of that air bypasses the combustion chamber, while the rest flows through the combustion chamber. A typical bypass ratio might be 5 to 1. The turbofan design is quieter and more fuel efficient than the turbojet design.

Both Turboprop and Turbofan engines employ compressors, a combustion chamber and turbines and use jet fuel.

Answer 3

A turboprop is a propeller plane whose propellers are driven by jet engines. Behind the propeller is a jet engine that turns a gearbox, which turns the propeller. A turbofan engine is a jet engine with a large ducted fan directly in front of the first stage compressor. the fan is driven directly by the engine and no gearbox is involved. another difference between the two is that with a turbofan, total thrust is a combination of thrust from the jet engine core, as well as the thrust from the fan. With turboprops, nearly all, if not all thrust comes from the propeller.

Examples of turboprops are the Saab 340B, and the ATR 72 examples of turbofan aircraft are the 717,727,737,747,757,767,777, etc.

Answer 4

This gets complicated, so hang on.

Aircraft engines are internal combustion engines. That means they burn fuel inside them somehow.

There are two types of internal combustion engines. They are reciprocating and turbine.

A reciprocating engine is an engine that compresses the air/fuel mixture with pistons, like in your car. It is used to turn a propeller.

A turbine engine is an engine that uses an air compressor to compress the air, then injects fuel, which burns.

Air enters the engine at the front, and is squeezed and heated by the compressor. (If you squeeze air, it heats.) The compressor is a set of moving and stationary blades that channel the air in a very specific way. After the compressor, the air is channeled into the combustion chamber. Fuel is injected into the air in the combustion chamber, and it burns and heats the air even more. Finally, the air is forced through a an exhaust turbine before it exits the engine. The exhaust turbine is a fan that is used to turn a shaft that powers the moving blades in the compressor.

A turbine engine has very few moving parts, and will continue running until you turn off the fuel. It is much more simple than an automobile engine, but the extreme heat and tight tolerances make it very expensive. Also, a small turbine engine can be used to develop vast amounts of power, especially when compared to a reciprocating engine.

Turbine engines can propel an aircarft by their exhaust (turbojet), turning a propeller (turboprop or turboshaft) or by turning a fan (turbofan.)

The turbojet engine is the simplest of the turbine engines. There are very few turbojets. It was an early design, and has been superceded. It wastes a lot of energy, and uses a lot of fuel in comparison to the others.

A turboprop (or turboshaft) engine has a slightly different design. Instead of using the exhaust of the engine to push the airplane around, the exhaust turbine is also connected to a gearbox similar to an automobile transmission. The exhaust gasses turn the turbine, which then turns the transmission. The transmission is then used to power a number of different things. It can be used to turn a propeller (turboprop aircraft), turn the main rotor on a helicopter, turn wheels (like the M1 Abrams tank), or even turn a ship's propeller (like many destroyers in the US Navy).

A turbofan engine attaches a large fan in front of the air compressor on a turbine engine. A turboJET engine takes a little bit of air and makes it move very fast. A turboFAN engine uses the fan to make a LOT of air move not very fast. This is more efficient. They take in a large amount of air in the front, but most of the air does not go into the combustion chamber. It just gets pushed out the back, providing thrust. The amount of air that gets sucked in the engine versus the amount that goes into the combustion chamber is called the bypass ratio. HIGH bypass turbofans power most of the commercial jets you see, like Boeing 747's. Their fans can be over 14 feet in diameter.

Answer 5

Both are turbine powered, and are differentiated from what you might call a "jet" in that the turbine powers a device, either the fan or the prop, to move air rather than just propulsion from the burning gasses coming out the back of the turbine. A turbo-prop has a big normal looking propeller like a piston aircraft, just that instead of a piston engine it has a turbine engine. A turbo fan has a large cowl over the front of the turbine engine that has a bunch of smaller fan blades (shaped like airfoils). A turbo fan looks like a regular jet engine but the blades on the front are actually the fan blades, not the compressor for the turbine.

Answer 6

Both are powered by turbine engines, the turbo-prop has a propeller and is much more fuel efficient at low altitudes which is why many carriers use them for shorter flights. You can view some turbofan private jets at: http://www.jets.com/private_jets.aspx under the light jet category.

Answer 7

turbofan is JET turboprop is PROP

Answer 8

They're all turbines. One turns an external prop, one turns an internal fan or cage and one just uses the turbine exhaust for thrust.

Answer 9

A fan sets in the audience. a prop is part of the stage setting

Answer 10

one has a prop attached to it through a shaft, the other has the fan within the engine cowling.