What is bypass ratio?

Bypass ratio in an early single- or twin-spool bypass engine is the ratio of the cool air mass flow passed through the bypass duct to the air mass flow passed through the high-pressure system. Typically, this early evolution of the bypass engine has a low bypass ratio.

Alternatively, bypass ratio for a fan-ducted bypass engines is the ratio of the total airmass flow through the fan stage to the airmass flow that passes through the turbine section/high-pressure (engine core) system. Ahigh bypass ratio, is usually common with ducted fan engines.

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