Aircraft Turbojets

Lecturer(s): Xavier OTTAVY, Pierre DUQUESNE
Course ⋅ 10 hTC ⋅ 4 hPW ⋅ 4 hAutonomy ⋅ 10 hStudy ⋅ 4 h


This lecture has several objectives:

  • to get deeper into the details concerning the notions of aero-energetics in the frame of open systems with compressible flows, which are essential for the understanding and the study of the performance of turbojet engines.
  • to list and sort the different propulsion systems for aeronautics (turbojet, turbofan, turboprop...) with the associated aircraft.
  • to learn how to calculate the performance of turbojet engines, for a prescribed operating point, and to know how to simply design a propulsion system.


aéroénergétique, écoulements compressibles, turboréacteur, turbofan, turbopropulseur, poussée,performances


  • Aero-thermodynamics of the steady quasi-monodimensional flows (quantification and effects of the exchanges of work, heat and viscous shear layers)
  • Complements of aero-thermodynamics for open systems with compressible flows
  • Characterisation of compressors and turbines (exchanged energy, efficiency, performance map, mechanical behaviour, vibrations and material)
  • Aero-mechanical characterisation of the other components (combustor, nozzle, ...)
  • Performance analysis of the turbojet engines
  • First approach and tools for the design of turbojet engines

Learning Outcomes

  • To understand the operating of the parts of turbojet engines (fan, compressor, combustor, turbine, nozzle,...)
  • To understand and analyse the thermodynamic cycle of turbojet engines
  • To be able to calculate the performance of turbojet engines (thrust, efficiency, consumption, ...)
  • To be aware of the new concepts that will drive the design of the new turbojet engines.