Narrowbody and Widebody engine developments, Part 2

By Bjorn Fehrm

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April 19, 2018, © Leeham News: In an article last week, we discussed the reason the new narrow-body engines are catching up to the fuel consumption of the wide-body engines.

Today we dig a bit deeper into the efficiency changes of the different engines and discuss which parameter changes have caused what changes in engine efficiency.

We will use our engine modeling software GasTurb to analyze what happens in a Turbofan when we change certain parameters.


  • The engine's Core or Thermal efficiency changes with Turbine Entry Temperature (TET).
  • To fully utilize such an increase in efficiency we need to adapt the overall design of the engine.

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