1. Department of Mechanical Engineering, Imperial College London , South Kensington Campus, London SW7 2AZ, UK
2. Department of Mechanical Engineering, Imperial College London , South Kensington Campus, London, SW7 2AZ, UK ; , Liège 4000, Belgium
3. Department of Aerospace and Mechanical Engineering, Mechanical Aspects of Turbomachinery and Aerospace Propulsion, University of Liège , South Kensington Campus, London, SW7 2AZ, UK ; , Liège 4000, Belgium
4. Rolls-Royce plc , Derby DE2 48J, UK