Endoscopic Stereoscopic Particle Image Velocimetry (PIV)

• non-contact measurement of velocity fields in turbomachinery
• due the endoscopic design, no major interventions in the housing for optical access (windows) are necessary
• measurement of all three components of local flow velocities (in-place)

Two cameras each take two images of a particle-laden flow.

Evaluation and back transformation of the images yield the complete velocity field in the measuring plane. This allows large-scale investigations of unsteady flow structures as well as the determination of the steady-state flow field. At TFD, SPIV methods with purely endoscopic access are currently used in turbomachinery.

Advantages of the endoscopic stereo PIV system over other optical measurement methods are:

• small optical access,
• Determination of a velocity field (areal measurement),
• Determination of all three velocity components with moderate measurement duration.

In-house expansion of the system at TFD:

Use of endoscopes for light section generation and image acquisition.

• Flow velocity