Optical and acoustical field measurement techniques for complex applications
In the department of Experimental Methods, we develop optical and acoustical field measurement techniques for the acquisition of fluid-mechanical and aero-acoustical quantities and apply them mainly in large industrial wind tunnels and at in-flight testing for aerodynamics.
We acquire all data non-intrusively with high spatial and temporal resolution so that no interference of the flow field by the measurement occurs. In consequence, our methods are particularly suited for the aero-dynamical and aero-acoustical analysis of complex, unsteady three-dimensional flow fields. The acquired data sets constitute a reliable basis for the validation of numerical codes.
Quantitatively measurable values are pressure (PSP), velocity (PIV), location of transition lines (TSP), density (BOS), and sound pressure (Acoustic Microphone Array), in parallel with the determination of deformation (IPCT, PROPAC) and position of the model in the wind tunnel or of the wing of an aircraft or of a propeller. Our primary applications are in the scope of large industrial projects in European co-operation. For this purpose, we develop mobile measurement systems which can be adjusted flexibly to particular testing environments. The quality of the results obtained in the rough environment of industrial test facilities is comparable with the results attained in the laboratory of universities. Increasingly, we apply these measurement techniques in parallel to obtain a more complete description of the flow field by determining several physical quantities simultaneously.
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