A turbofan engine has a large fan at the front for the intake of air. Most of the air flows around the outside of the engine, making it quieter and giving more thrust at low speeds. In a turbojet all the air entering the intake passes through the gas generator, which is composed of the compressor, combustion chamber, and turbine. In a turbofan engine only a portion of the incoming air goes into the combustion chamber. The remainder passes through a fan, or low-pressure compressor, and is ejected directly as a "cold" jet or mixed with the gas-generator exhaust to produce a "hot" jet. The objective of the bypass system is to increase Thrust without increasing Fuel Consumption. This is achieved by increasing the total air-mass flow and reducing the Velocity within the same total energy supply.
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