2D sound transmission in the aeroacoustic wind tunnel

The prediction of aeroacoustic phenomena in compressor stages represents a key challenge in the field of turbomachinery, as acoustic modes, blade interaction, and flow instabilities are complexly coupled. In order to reliably evaluate and further develop numerical methods such as the harmonic balance routines implemented in TRACE, experimentally robust validation data is required. SiValt addresses this requirement by performing aerodynamic and acoustic measurements of various configurations in the AWT, supported by a newly designed mode generator that enables targeted excitation of defined circumferential and radial modes.

By combining an acoustically optimized diffuser to reduce reflections and the use of upstream and downstream microphone arrays, the propagation behavior of the coupled modes is recorded in detail. In parallel, numerical simulations are performed in TRACE 9.4, the quality of which is evaluated based on the stationary and unsteady experimental measurement data. The project thus creates a valid basis for the systematic evaluation of aeroacoustic modeling and contributes to the improvement of numerical prediction methods for compressor flows.

The project is managed by the Institute for Turbomachinery and Fluid Dynamics.