Optimization and Model Validation of Transonic Compressors
Licentiatavhandling, 2012

Economical aspects such as reduced specific fuel consumptions and ever growing environmental requirements on emissions and percieved noise levels, are the major drivers in the search for improvement of aircraft engines. For turbofan engines, the global trend is towards higher efficiency which is accomplished by increasing component efficiencies, the bypass ratio and overall pressure ratio while keeping the engine weight low. Concerning the low pressure system, the reduction in weight can be realized by decreasing the number of stages in the compressor. However by doing so, the aerodynamic load per stage must be increased in order to maintain the same pressure ratio. As the aerodynamic load increases, it becomes more difficult to maintain a high efficiency on the aerodynamic design point and keep a sufficiently high stability margin along the compressor working line. In this thesis a new design methodology, accounting for both efficiency and stability, is presented. In order to utilize the design process for industrial applications, the reduction in total design time and computational resources are also adressed. The validity of the presented analysis method is put to test by means of two validation cases. The first case is a transonic rotor in isolation and the second case is a three stage highly loaded transonic compressor.








Opponent: Olivier Bron


Lars R Ellbrant

Chalmers, Tillämpad mekanik, Strömningslära

CFD optimization of a transonic compressor using multiobjective GA and metamodels

28th Congress of the International Council of the Aeronautical Sciences 2012, ICAS 2012; Brisbane; Australia; 23 September 2012 through 28 September 2012,; Vol. 4(2012)p. 2698-2712

Paper i proceeding

Design of compressor blades considering efficiency and stability using CFD based optimization

ASME Turbo-expo 2012,; Vol. 8(2012)p. 371-382

Paper i proceeding

CFD validation of a high speed transonic 3.5 stage axial compressor

ISABE-2011,; (2011)

Konferensbidrag (offentliggjort, men ej förlagsutgivet)





C3SE (Chalmers Centre for Computational Science and Engineering)


Strömningsmekanik och akustik

Technical report - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden


Opponent: Olivier Bron