How does a geared turbofan work?
In a geared turbofan, a planetary reduction gearbox between the fan and the LP shaft allows the latter to run at a higher rotational speed thus enabling fewer stages to be used in both the LP turbine and the LP compressor, increasing efficiency and reducing weight. The geared turbofan is a type of turbofan aircraft engine with a planetary gearbox between the low pressure compressor / turbine and the ducted fan, enabling each to spin at its optimum speed. The benefit of the design is lower fuel consumption and much quieter operation.In a geared engine, the gearbox allows both the fan and turbine to run at their optimum speeds. In this case, the turbine can run faster with fewer stages and airfoils, which increases efficiency. The fan can run at a slower speed but at a larger diameter to push larger amounts of air at a slower velocity.
What are the three types of turbofan engines?
A process known as combustion, this creates hot exhaust gases that are expelled out a nozzle. Common types of turbofan engines include low bypass, high bypass and afterburner. Low-bypass turbofan engines have a low bypass ratio, meaning most of the air enters the core. 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. The hot exhaust passes through the core and fan turbines and then out the nozzle, as in a basic turbojet.
What are the 4 types of aircraft engines?
Many aircraft use a form of the gas turbine engine to produce power for thrust. These engines are normally the turboprop, turboshaft, turbofan, and a few turbojet engines. Turbofan engines power a wide range of aircraft, from commercial airliners like the Boeing 747, Airbus A320, and Boeing 787, to modern fighter jets such as the F-22 Raptor and Eurofighter Typhoon.