Turbofans fall into two main categories – low-bypass ratio and high-bypass ratio. The bypass ratio refers to the volume of incoming air that passes through the fan ducts compared wth the volume of incoming air that passes through the jet core. In a low-bypass turbofan, only a small amount of air passes through the fan ducts and the fan has only a small diameter. The fan in a high-bypass turbofan is much larger to force a large volume of air through the ducts. The low-bypass turbofan is more compact, but the high-bypass turbofan can produce much greater thrust, is more fuel efficient, and is much quieter.
See also turbofan engine and ramjet.
Related category AERODYNAMICS AND AERONAUTICS
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