Vehicle Aeroacoustics Wind Tunnel
The full scale aeroacoustics wind tunnel at FKFS, last modernized in 2014, is one of the most state-of-the-art of its kind in Europe for aerodynamic testing of passenger cars, vans and racing cars. In addition to acoustic measurements, other extensive testing options are available for measuring forces, pressures and speeds, as well as air flow visualization.
The wind tunnel features a horizontal air line with an open jet test section (Göttingen-type wind tunnel). In order to represent the flow conditions of a vehicle driving on a road surface as realistically as possible, tests are carried out with rotating wheels and moving ground in the wind tunnel. This is done using a 5-belt system, consisting of a moving center belt and four wheel drive units, combined with different boundary layer conditioning systems.
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Technical Data
| Dimensions | |
| Dimensions of nozzle (width x height) | 5.8 m x 3.87 m |
| Exit area of nozzle | 22.45 m2 |
| Contraction ratio | 4.41 |
| Length of open jet test section | 9.95 m |
| Diameter of axial fan | 7.1 m |
| Operating output | 3.3 MW (335 1/m) |
| Max. flow velocity | 260 km/h |
Displacement height of boundary layer in the center of the ground plane (x=0) | |
| - without boundary layer influence | 15.5 mm |
| - with boundary layer pre-suction | 7 mm |
| - with road simulation | Block profile |
| Sound-pressure level of empty test section at 140 km/h: | |
| - Out-of-Flow | 64,7 dB(A) |
Application Examples
Application Examples
- Force and surface pressure measurements via moving belt system
- Flow field measurements with Cobra probe
- Total pressure measurements in the wake area of the vehicle model
- Aeroacoustic measurements with intensity probes at the car's surface and in its interior
- Surface vibration measurements with laser vibrometers
- Noise source localization with microphone arrays and an acoustic mirror
- Cooling air volume flow rate measurements
- Measurement of door deflection under wind load
- Ballooning measurements of convertible car roofs
- Frontal area measurements
