Metrology
For the acquisition of all relevant measured variables of aerodynamics, such as pressures, velocities, temperatures as well as forces and moments, the Chair has a variety of possible measurement techniques at its disposal. In addition to conventional probe and force measurement techniques, modern optical methods such as laser Doppler anemometry (LDA) and particle image velocimetry (PIV) are used for the quantitative analysis of velocity fields. Their non-contact and thus interference-free use with regard to the test setup can be practiced in all optically accessible areas.
Laser Doppler anemometer in use in the measuring section of the wind tunnel
The measurement methods of the Chair are in detail:
Quantitative Methods
- Pressure measurements and pneumatic probes
- stationary and transient on surfaces and in the flow field - Velocity measurements
- Thermoanemometry (up to 3 components)
- Particle Image Velocimetry (2 components) - Temperature measurements
- Resistance thermometers and thermocouples
- Thermography - Force and moment scales
- Different measuring ranges, up to 6 components - Concentration measurement technology
Qualitative Methods
- Flow visualization
- in the flow field with fog or smoke
- of wall flow lines with oil-soot coating
- High speed cameras for strongly unsteady processes - Sand erosion method
- Infrared thermography
- Schlieren optics and shallow water analogy
Visualization of wall streamlines on a delta wing