Transonic Cascade

In order to investigate the continuous flow through turbomachinery blading the institute set up a transonic test cascade. Within this test cascade turbomachinery blades can be arranged linearly. Optical access to the flow section is enabled through windows in the test rig. Together with pressure and temperature transducers modern laser-optical equipment is used for flow analysis in subsonic and transonic flows. The blade cascade can be exchanged easily so that various blading can be investigated.

Transonic Cascade

In the following picture you can see a linear blade cascade as used in a previous project with windows on both sides to enable optical access to the transonic flow region. The flow section (circular design) can be easily exchanged with other test sections. In the foreground the Laser Doppler Velocimeter (LDV) probe is visible.

Transonic Cascade

The following video shows the transonic test rig located in the first basement; you will see (from the left): two component LDV system including processors for real-time signal processing (Fourier Transformation) and a PC for data acquisition, data acquisition system for pressure and  temperature, and digital interferogram evaluation system. In the laboratory, you can see the transonic test rig with a Laser Doppler Velocimeter traverse (including the probe) in the front and the inlet piping from the right. The laboratory can also be used for hot turbine tests runs sucking air through acoustic insulators from the outside.

Transonic Cascade Lab


Institute of Thermal Turbomachinery and Machine Dynamics

Graz University of Technology
Inffeldgasse 25/A
A-8010 Graz

Tel: +43 (0)316 873 - 7226
Fax: +43 (0)316 873 - 107226