Swan neck duct

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A swan neck duct is a jet engine component, usually situated within the compression or turbine expansion system.

Many jet engines have a short annular passageway, linking two components, where there is a large change in mean radius, from front to rear. The shape of the resulting passageway is often similar to that of a swan or goose neck. Consequently, such a passageway is called a swan (or goose) neck duct.