Editing Turbofan (section)

===Nozzles===
The cold duct and core duct's nozzle systems are relatively complex due to the use of two separate exhaust flows. In high bypass engines, the fan is situated in a short duct near the front of the engine and typically has a convergent cold nozzle, with the tail of the duct forming a low pressure ratio nozzle that under normal conditions will choke creating supersonic flow patterns around the core{{Citation needed|date=August 2020}}. The core nozzle is more conventional, but generates less of the thrust, and depending on design choices, such as noise considerations, may conceivably not choke.<ref>{{cite journal|url=https://dspace.lib.cranfield.ac.uk/bitstream/handle/1826/12476/Civil_turbofan_engine_exhaust_aerodynamics-2017.pdf|title=Civil Turbofan Engine Exhaust Aerodynamics: Impact of Bypass Nozzle After-body Design|journal=Aerospace Science and Technology|volume=73|date=February 2018|pages=85–95|doi=10.1016/j.ast.2017.09.002 |access-date=1 March 2022|last1=Goulos |first1=Ioannis |last2=Stankowski |first2=Tomasz |last3=MacManus |first3=David |last4=Woodrow |first4=Philip |last5=Sheaf |first5=Christopher |bibcode=2018AeST...73...85G |hdl=1826/12476 }}</ref> In low bypass engines the two flows may combine within the ducts, and share a common nozzle, which can be fitted with afterburner.