Test facility

The experiments were carried out in the High Speed Cascade Wind Tunnel of the University of the Federal Armed Forces Munich, which is an open-loop test facility located inside an evacuable pressure tank (Fig. 3). Mach and Reynolds number in the test section can be varied independently by lowering the pressure level inside the tank and keeping the total temperature constant by means of an extensive cooling set-up, therefore allowing to simulate real turbomachinery conditions (Sturm & Fottner 1985). All test were performed with a constant total temperature of 303 K. The turbulence intensity of the inlet ft>w is adjusted by fitting a turbulence grid upstream of the nozzle.

Experimental Investigation of Compressor Cascade Wake-Induced Transition 361