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Experimental Methods

Göttingen

 

Particle Image Velocimetry in DNW-TWG
.
360°-PSP measurement in DNW-HST
.
Flap gap measurement of an AIRBUS A340
.
Acoustic source map of a Dornier DO-728 half model in DNW-KKK

The Department of Experimental Methods develops optical and acoustical field measurement techniques for the acquisition of fluid-mechanical and aero-acoustical quantities and applies them mainly in large industrial wind tunnels and at in-flight testing for aerodynamics.

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. Application is mainly performed in the scope of large industrial projects in European co-operation. For this purpose mobile measurement systems have been developed by the department, which can be flexibly adjusted 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.

All data is acquired with high spatial and temporal resolution non-intrusively so that no interference of the flow field by the measurement is to occur. In consequence, the methods developed 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.

Increasingly, these image based measurement techniques are applied in parallel to obtain a more complete description of the flow field by determining several physical quantities simultaneously.

Measurement techniques

  • for flow field analysis:
    PIV, Tomo-PIV, PTV (Shake-The-Box), BOS
  • for surface analysis: PSP, TSP, Position detection, EDT, IPCT, PROPAC/REPAC
  • for sound field analysis: Phased Microphone Array
  • Non-standard Video Systems: High performance LED Illuminator, High-speed video stroboscope

Hard- and software products

  • Hard- and software developed by the department EXV

Projects

  • AIM² - Advanced In-flight Measurement Techniques 2
  • ALSA - Akustische Lokalisation von Strömungsablösung im ETW
  • AVERT
  • CREDO - Cabin noise Reduction by Experimental and numerical Design Optimization
  • EWA - European Windtunnel Association
  • FAR-Wake - Aircraft Wake Phenomena
  • FLIRET - Flight Reynolds Number Testing
  • HOMER - Holistic Optical Metrology for Aero-Elastic Research
  • MARS - Manipulation of Reynolds Stress for Separation Control and Drag Reduction
  • MEPHISTO
  • PivNet 2 - Particle Image Velocimetry for industrial applications
  • SAMURAI - Synergy of Advanced Measurement Techniques for Unsteady and High Reynolds Number Aerodynamic Investigations
  • SIMKAB
  • TELFONA - Testing for Laminar Flow on New Aircraft
  • VicToria – Virtual Aircraft Technology Integration Platform
  • X3NOISE

Conferences and courses

  • MA|AM Course, May 2018
  • PIV Course, March 2019
  • PSP Course, 2019
  • DGLR-Workshop: CFD and Experiment - Integration of Simulation, April 2011
  • 25 Years of PIV in Aerodynamics 

 Awards

  • DLR Innovation Prize 2011 for the High Performance LED Illuminator
  • Best Movie Award: PIV analysis of L. Prandtl's historic flow visualization movies

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

Ilka Micknaus
Assistant

German Aerospace Center

Institute of Aerodynamics and Flow Technology
, Experimental Methods
Göttingen

Tel.: +49 551 709-2468

Fax: +49 551 709-2830

Catrin Rosenstock
Project Assistant

German Aerospace Center

Institute of Aerodynamics and Flow Technology
, Experimental Methods
Göttingen

Tel.: +49 551 709-2461

Fax: +49 551 709-2830

Related Articles
Particle Image Velocimetry (PIV)
Tomographic Particle Imaging Velocimetry (Tomo-PIV)
Shake-The-Box: 3D Lagrangian Particle Tracking at high Particle Densities
Background Oriented Schlieren Method (BOS)
Pressure Sensitive Paint (PSP)
Temperature Sensitive Paint (TSP)
Optical position detection
Edge Detection Technique (EDT)
Image Pattern Correlation Technique (IPCT)
Application of Image Pattern Correlation Technique (IPCT)
Projected Pattern Correlation (PROPAC) / Reflected Pattern Correlation (REPAC)
Mobile system for acoustical measurement techniques (SAG)
Microphone array
High performance LED Illuminator
The High-Speed Video Stroboscope
Hard- and Software products
Advanced In-flight Measurement Techniques 2
ALSA
PIV and BOS measurements at an airfoil in transonic buffeting with flow control
Cabin noise Reduction by Experimental and numerical Design Optimization
Network of Excellence European Windtunnel Association (EWA)
Flight Reynolds Number Testing
MARS
MEPHISTO - Militärische Forschung zu Verfahren und Technologien für den Gesamtentwurf von UAVs
SAMURAI
SIMKAB
Testing for Laminar Flow on New Aircraft
X3-NOISE
Related Topics
Aerodynamic
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