Checking date: 08/06/2018

Course: 2018/2019

Aerospace Propulsion
Study: Bachelor in Aerospace Engineering (251)

Coordinating teacher: IANIRO , ANDREA

Department assigned to the subject: Department of Bioengineering and Aerospace Engineering

Type: Compulsory
ECTS Credits: 6.0 ECTS


Students are expected to have completed
Introduction to Fluid Mechanics Fluid Mechanics Thermal Engineering Introduction to structural analysis We strongly advise you not to take this course if you have not passed Fluid Mechanics and Thermal Engineering
Competences and skills that will be acquired and learning results. Further information on this link
Applied knowledge of: theory of propulsion; jet engine performance; propulsion system engineering.
Description of contents: programme
1 Introduction to aerospace propulsion: Thrust generation and jet propulsion Effect of external expansion on thrust Global performance parameters Range of aircraft Efficiencies 2 Aircraft Engine Modeling: the Turbojet: Thrust equation Shaft balance for the turbojet Fuel consumption Design parameters Effect of mass flow on thrust Note on Ramjets Propulsive efficiency Thermal and overall efficiencies 3 Introduction to Component Matching and Off-Design Operation Discussion on nozzle choking Component matching Effects of Mach number Examples Compressor-turbine matching. Gas generators 4 Turbofan Engines Ideal turbofan model Shaft balance Velocity matching condition Optimal compression ratio 5 Inlets and Nozzles Inlets or Diffusers Subsonic Inlets Supersonic Inlets Exhaust nozzles 6 Principles of Compressors and Fans Euler equation Velocity triangles Isentropic efficiency and compressor map . . 7 Compressor Blading, design and multi-staging Diffusion factor. Stall and surge Compressor blading and radial variations Multi-staging and flow area variation Mach Number Effects The Polytropic Efficiency Starting and Low-Speed Operation 8 Turbines. Stage characteristics. Degree of reaction: Euler¿s Equation Degree of Reaction Radial variations Rotating blade temperature 9 Turbine solidity. Mass flow limits. Internal cooling: Solidity and aerodynamic loading Mass flow per unit of annulus area and blade stress Turbine cooling. General trends and systems. Internal cooling. 10 Film cooling. Thermal stresses. Impingement: Film cooling Impingement cooling Thermal stresses How to design cooled blades 11 Combustion: Combustors and Pollutants Combustion process Combustor chambers Combustor sizing Afterburners Pollutants: regulations Mechanisms for pollutant formation Upper-Atmospheric Emissions 12 Introduction to engine noise and aeroacoustics: Noise propagation Acoustic energy density and power flux Noise sources and noise modeling Jet Noise Turbomachinery noise 13 Engine rotating structures Blade loads Centrifugal stresses and disc design 14 Fundamentals of rotordynamics: Bearings and engine arrangements Lumped mass model Critical speeds Forces on bearings Comments on blade vibrations
Learning activities and methodology
Theory sessions. Problem sessions working individually and in groups. Computer sessions. Lab-sessions.
Assessment System
  • % end-of-term-examination 60
  • % of continuous assessment (assigments, laboratory, practicals...) 40
Basic Bibliography
  • J.D. Mattingly. Elements of Propulsion: Gas Turbines and Rockets. AIAA. 2006
  • J.L. Kerrebrock. Aircraft Engines and Gas Turbines. MIT Press. 1992
Additional Bibliography
  • N. Cumpsty. Jet Propulsion. Cambridge Univ. Press. 2003
  • Saeed Farokhi. Aircraft Propulsion. Wiley. 2014

The course syllabus and the academic weekly planning may change due academic events or other reasons.

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