1. German Aerospace Center (DLR) Institute of Propulsion Technology, , Linder Höhe, 51147 Cologne , Germany
2. German Aerospace Center (DLR) Institute of Test and Simulation for Gas Turbines, , Linder Höhe, 51147 Cologne , Germany
3. MTU Aero Engines AG , Dachauer Str. 665, 80995 Munich , Germany