High dynamic velocity range particle image velocimetry using multiple pulse separation imaging
Citation:
Persoons T, O'Donovan T S, High dynamic velocity range particle image velocimetry using multiple pulse separation imaging, Sensors, 11, 1, 2011, 1-18Download Item:
sensors-03-343-tara.pdf (Published (author's copy) - Peer Reviewed) 421.6Kb
Abstract:
The dynamic velocity range of particle image velocimetry (PIV) is determined by the maximum and minimum resolvable particle displacement. Various techniques have extended the dynamic range, however flows with a wide velocity range (e.g., impinging jets) still challenge PIV algorithms. A new technique is presented to increase the dynamic velocity range by over an order of magnitude. The multiple pulse separation (MPS) technique (i) records series of double-frame exposures with different pulse separations, (ii) processes the fields using conventional multi-grid algorithms, and (iii) yields a composite velocity field with a locally optimized pulse separation. A robust criterion determines the local optimum pulse separation, accounting for correlation strength and measurement uncertainty. Validation experiments are performed in an impinging jet flow, using laser-Doppler velocimetry as reference measurement. The precision of mean flow and turbulence quantities is significantly improved compared to conventional PIV, due to the increase in dynamic range. In a wide range of applications, MPS PIV is a robust approach to increase the dynamic velocity range without restricting the vector evaluation methods.
Sponsor
Grant Number
European Commission
Irish Research Council for Science and Engineering Technology (IRCSET)
Author's Homepage:
http://people.tcd.ie/persoontDescription:
PUBLISHED
Author: PERSOONS, TIM
Type of material:
Journal ArticleSeries/Report no:
Sensors11
1
Availability:
Full text availableKeywords:
high dynamic range, velocity measurements, PIV, impinging jet flow, laser-Doppler velocimetrySubject (TCD):
Smart & Sustainable Planet , TelecommunicationsLicences: