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Institute of Turbomachinery and Fluid Dynamics
Logo Leibniz Universität Hannover
Institute of Turbomachinery and Fluid Dynamics
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Endoscopic Stereoscopic Particle Image Velocimetry (PIV)

Field of Application

  • Non-contact measurement of velocity fields in turbomachinery
  • No major orifices in the casting for optical access are necessary with endoscopic version
  • Measurement of all three components of the local velocities (in-plane)

Measured Quantity

  •     Flow velocity

Specification

Stereo Particle Image Velocimetry (PIV) is a non-invasive optical method by which the three components of the instantaneous velocity vectors can be determined in the measuring plane. Each of the cameras takes two shots of a particle-loaded flow.

Analysis and reverse transformation of the images reveals the velocity vectors across the whole frame. This allows both large-scale investigation of unsteady flow structures and determination of the stationary flow field. These methods currently are used with a purely endoscopic entrance in turbomachinery at the TFD.

Advantages of the endoscopic stereo-PIV system in comparison to other optical measurement methods are:

  • Small optical entrance
  • Determining a velocity field (field measurement)
  • Determination of all three velocity components within moderate measurement time

Specific extensions of the system at the TFD:

  •     Use of endoscopes for the generation of the light sheet and image capture

Contact

Dipl.-Ing. Philipp Gilge