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Experimental Methods

Göttingen

Use of optical measurement techniques at the flight envelope boundary in the European Transonic Wind Tunnel in Cologne., Credit: DLR (CC BY-NC-ND 3.0)

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.

Competencies

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.

Research main topics

  • Flow field analysis:
    • Background Oriented Schlieren Method (BOS)
    • Shake-The-Box (Particle Tracking Velocimetry (PTV))
    • Particle Image Velocimetry (PIV)
    • Tomographic Particle Imaging Velocimetry (Tomo-PIV)
  • Surface analysis:
    • Pressure Sensitive Paint (PSP)
    • Temperature Sensitive Paint (TSP)
    • Optical position detection
    • Edge Detection Technique (EDT)
    • Image Pattern Correlation Technique (IPCT)
    • Projected Pattern Correlation (PROPAC) / Reflected Pattern Correlation (REPAC)
  • Sound field analysis:
    • Mikrophone-Array (Phased Microphone Array)
  • Non-standard Video Systems:
    • High performance LED Illuminator
    • High-speed video stroboscope

Contact
Dr. Lars Koop
German Aerospace Center

Institute of Aerodynamics and Flow Technology
, Experimental Methods
Göttingen

Tel.: +49 551 709-2460

Fax: +49 551 709-2830

Projects
HOMER - Holistic optical metrology for aero-elastic research
HighFly - Aerodynamics, aeroelasticity, structures and propulsion on the ISTAR research aircraft
Courses
PSP Course - Application of Pressure Sensitive Paint - Theory and Practice
PIV Course - Application of Particle Image Velocimetry
MA|AM Course - Microphone Arrays for Aeroacoustic Measurements
Related Topics
Research and Support Facilities (Air)
Aerodynamic
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