Verification of fully developed flow entering diffuser and particle image velocimetry procedures
3-D stereoscopic PIV is capable of measuring 3-dimensional velocity components. It involves a very sophisticated routine during setup, calibration, measurement and data processing phases. This paper aims to verify the 3-D stereoscopic PIV measurement procedures and to prove that the flow entering th...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Published: |
2013
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4624/ http://eprints.uthm.edu.my/4624/1/AMMJ_2014_(3).pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 3-D stereoscopic PIV is capable of measuring 3-dimensional velocity components. It
involves a very sophisticated routine during setup, calibration, measurement and data processing
phases. This paper aims to verify the 3-D stereoscopic PIV measurement procedures and to prove
that the flow entering the diffuser is a fully developed flow. A diffuser inlet of rectangular crosssection,
130 mm x 50 mm is presently considered. For verification, the velocities from PIV are
compared with the velocities from pitot static probe and theory. The mean velocity obtained using
pitot static probe is 2.44 m/s, whereas using PIV is 2.46 m/s. It thus gives the discrepancy of 0.8%.
There is also a good agreement between the mean velocity measured by PIV and theoretical value
with the discrepancy of 1.2%. This minor discrepancy is mainly due to uncertainties in the
experiments such as imperfect matching of coordinates between the probe and laser sheet,
unsteadiness of flow, variation in density and less precision in calibration. Basically, the operating
procedures of 3-D stereoscopic PIV have successfully been verified. Nevertheless, the flow entering
diffuser is not perfectly developed due to the imperfect joining duct and the abrupt change of inlet
cross-section introduced. Therefore, improvement to the existing rig is proposed by means of
installing settling chamber with multiple screens arrangement and contraction cone. |
|---|