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The low-bypass-ratio turbofan engine contains a multi-stage fan that generates comparatively high-pressure ratios, resulting in higher exhaust gas velocities (cold or mixed). The turbofan has the following three major types:Ī type of engine that uses jet thrust more than fan thrust is called a low bypass turbofan. Therefore, scientists designed the turbofan to avoid extra fuel consumption and improve fuel economy. These engines have slow speed and low efficiency. This process increases the thrust, but the exhaust gases exit the engine with a high velocity which consumes additional engine power.ĭue to the above-given reasons, the jet engine consumes a high amount of fuel. Turbofan engine was designed to avoid the unwanted properties of subsonic flight efficiency of turbojet engines.Īn obvious way to improve turbojet engine efficiency is to raise the burner temperature to improve Carnot efficiency and fit the nozzle and larger compressor. This flow of air is known as the bypass or fan airflow. The speed of the air flowing by the fan is slightly faster than the speed of the air flowing free.When high-speed gases are discharged from the nozzle into the atmosphere, they generate thrust, which moves the airplane forward.When the exhaust gases enter the nozzle, the nozzle converts their pressure energy into speed and converts them into very high-speed gases.The remaining power of the combusted mixture is sent toward the exhaust nozzle. The turbine blades extract enough power from the combusted mixture to move the low-pressure compressor and fan. After entering the turbine, the hot gases expand into the turbine and strike the turbine blades.After combustion of the air-fuel mixture, the combusted gas enters into the low-pressure and high-pressure turbine.The high-pressure compressor makes the air temperature so high that when it touches the fuel in the combustion chamber, the combustion process starts itself.When the low compressed air comes into the high-pressure compressor, it further compresses the air up to very high pressure and also high increases its temperature.After suction, the air enters into a low-pressure compressor which increases the pressure of the air according to the requirements and sends it into a high-pressure compressor.Some part of the air enters the engine core where combustion takes place while the remaining part of the air (bypass air) moves outside of the engine core by a duct.Firstly, the air is sucked inside the engine via a fan, and air divides into two various paths.A turbofan engine works in the following way: The working of the turbofan engine is very similar to the turboprop engine. One “spool” is for the core, and the other “spool” is for the fan.
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This arrangement of engine knows as a 2-spool engine. Because of some mechanical reasons, the fan shaft passes by a central shaft. Turbines and fans have multiple blades like a central turbine and a central compressor linked through an extra shaft. In this type of engine, the core engine surrounds via a front fan and an additional turbine at the rear. The turbofan engine is also known as a bypass or fanjet engine. Bypass air is blown through a ducted fan. What is a Turbofan?Ī turbofan engine is a modified type of jet engine that uses a combination of bypass air and jet core efflux to create thrust. The turbofan has an additional fan which helps to accelerate a lot of mass without combusting extra fuel. A turbofan engine is most commonly utilized in aircraft propulsions. The fanjet or turbofan engine is a famous type of engine from the category of jet engine. There are different types of jet engines, and a turbofan is one of them. Jet engines are used all over the world for different types of airplanes. 8.9 What are the types of Turbofan Engines?.8.8 Which is better, turboprop or turbofan?.8.7 Why are turbofans quieter than turbojets?.8.6 What drives the fan in a turbofan engine?.8.4 What type of aircraft are turbofan engines most widely used on?.8.2 What are the advantages of a turbofan engine?.8 What is the difference between a turbofan and a turboprop engine?.