Straight Cascade Wind Tunnel

The Straight Cascade Wind Tunnel at the DLR Institute of Propulsion Technology in Göttingen is used for aerothermodynamic investigations on planar, vertical cascades of high, medium or low pressure turbines of aircraft engines as well as gas and steam turbines.

The straight cascade wind tunnel can be used to investigate planar cascades at Mach numbers in the sub- to supersonic range and at engine-relevant Reynolds numbers. Depending on the application, either profile or end wall tests are performed. A row of blades can be installed over a height of 400mm to approximate a theoretically infinite grid. Three independently controllable cooling ducts are available for analysing cooling air problems. The particular advantage of this test rig is its excellent accessibility. This allows the flow to be easily visualised and analysed using sophisticated measurement technology.

Measurement techniques such as pressure, temperature and multi-hole probes are recorded both stationary and time-resolved as standard. Hot wires and hot films are also used.

Characteristics of the test bed

Technology Readiness Level 3-4

Blade length 125 mm

Duct height 400 mm

Proven periodicity of the grille flow

Research topics

High, medium or low pressure turbines

Gas and steam turbines for power generation

Heat transfer and cooling air effects

Shock boundary layer interaction and transition

Optical measurement techniques

Particle Image Velocimetry (PIV)

Pressure-Sensitive Paint (PSP)

Temperature-Sensitive Paint (TSP)

Infrarot Imaging


Tecnical Data




Inlet pressure [kPa]


< 450

Inlet temperature [K]


253 - 300

Air mass flow [kg/s]

< 5

< 2

Mach number (outflow) [-]



Reynolds number (outflow) [-]

0,1-2,7 Mio.