1. Institute of Jet Propulsion and Turbomachinery, Technische Universit¨at Braunschweig, Hermann-Blenk-Str. 37, 38108 Braunschweig, Germany
2. Cluster of Excellence SE2A – Sustainable and Energy Efcient Aviation, Technische Universit¨at Braunschweig, Universit¨atsplatz 2, 38092 Braunschweig, Germany
3. Institute of Turbomachinery and Fluid Dynamics, Leibniz Universit¨at Hannover, An der Universit¨at 1, 30823 Garbsen, Germany