Swan neck duct

A swan neck duct is a jet engine factor, normally located inside the compression or turbine expansion machine.

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• Many jet engines have a short annular passageway, linking  components, wherein there may be a massive alternate in mean radius, from the front to rear. The shape of the resulting passageway is regularly similar to that of a swan or goose neck. Consequently, this sort of passageway is referred to as a swan (or goose) neck duct. The duct affords a non-stop matching of the flows among the excessive pressure and occasional strain generators and a ramification of the flow upstream of the low pressure turbine. For the latter reason a swan neck duct is an example of an inter-turbine diffuser.