Typical bypass duct, in a high bypass ratio turbofan

A bypass duct is an annular passage that allows some of a turbofan's airflow to bypass the engine core, or gas generator. If the turbofan is unmixed, the bypass duct will terminate at the bypass nozzle. In mixed turbofans, the bypass duct leads to the cold chute of a forced mixer or cold mixer of an annular mixer. Annular, annulate, &c. ... CFM56-3 turbofan, lower half, side view. ... An engine is something that produces some effect from a given input. ... A gas generator usually refers to a propellant mixture, often similar to a solid rocket propellant, that burns to produce large volumes of gas. ...

Some bypass ducts are unlined, so the bypass air must pass over a series of flanges, pipes, etc associated with the engine core, which increases the bypass duct pressure loss. A lined bypass duct has a lower pressure loss, due to the streamlining effect of the inner wall introduced. Jump to: navigation, search A flange is an external or internal rib, or rim, for strength, as the flange of an iron beam; or for a guide, as the flange of a car wheel; or for attachment to another object, as the flange on the end of a pipe, steam... Look up pipe in Wiktionary, the free dictionary. ... Jump to: navigation, search Pressure (symbol: p) is defined as the magnitude of the normal force divided by the area over which the normal force acts. ...