Jet engine performance: Difference between revisions

Revision as of 04:03, 29 January 2024

Revision as of 21:45, 13 May 2024

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There are pressure losses due to duct wall friction in all ducts but an afterburner has additional losses caused by flameholders and fuel supply tubes.

The fundamental pressure loss, that due to burning, increases with Mn at entry to burning zone and with the amount of fuel burned in terms of the increase in temperature in the afterburner.<ref>{{cite book|url=https://link.springer.com/book/10.1007/978-3-319-75979-1,"|pages=544–545|doi=10.1007/978-3-319-75979-1 |title=Propulsion and Power", |date=2018 |last1=Kurzke and|first1=Joachim |last2=Halliwell, pp.|first2=Ian 544–545|isbn=978-3-319-75977-7 }}</ref>

Although there is no turbine to limit the temperature of an afterburner there is still a cooling air requirement for the duct liner and variable nozzle which is about 10% of the engine entry airflow. The oxygen in this air is not available for burning.<ref>{{cite book|url=https://link.springer.com/book/10.1007/978-3-319-75979-1,"|page=545|doi=10.1007/978-3-319-75979-1 |title=Propulsion and Power", |date=2018 |last1=Kurzke and|first1=Joachim |last2=Halliwell, p.|first2=Ian 545|isbn=978-3-319-75977-7 }}</ref>

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