Challenges in aero engine performance modeling
Licentiatavhandling, 2016

There is a continuous drive for ever more efficient aero engines due to environmental as well as economical concerns. As the technology of conventional turbofan engines matures, there is a need for new aero engine concepts as well as incremental improvement of existing technologies. In order to improve existing turbofan architectures there is a trend towards integrating the design of the different components in the whole engine system. This creates new challenges both within engine manufacturing companies and between overall equipment manufactures (OEMs) and their suppliers. Methods need to be developed where different component requirements can be balanced against each other for the best performance of the system as a whole. Furthermore, there is a need for multidisciplinary design and optimization, coupling simulations involving several different computational disciplines. In this thesis, a method for consistent conceptual design is presented. In consistent design, the outcomes of the conceptual design are used to iteratively update the assumptions made in the initial thermodynamic cycle calculations until they are consistent. This enables the designer to balance different components against each other. In addition, a first coupling study of a turbine rear structure and whole engine performance is made, indicating the necessity of coupled simulations. Some considerations regarding modeling of engines at conditions far off-design are made. This is needed because some dimensioning mechanical load cases occur at these operating points. Finally, non-hierarchical analytical target cascading is introduced as a method that can be used for coupled optimization during the remainder of this research project.

part-load modeling

Aero engine

conceptual design

performance modeling

multidisciplinary design

Opponent: Marcus Thern, Associate Professor, Department of Energy Sciences, Lund University


Sebastian Samuelsson

Chalmers, Tillämpad mekanik


Hållbar utveckling

Innovation och entreprenörskap





Rymd- och flygteknik


Strömningsmekanik och akustik


Opponent: Marcus Thern, Associate Professor, Department of Energy Sciences, Lund University

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