Long-range ?PIV in the turbulent region of a jet, at high Reynolds numbers

Conference paper
Department
Process Energy (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: Westerweel, J.
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Source:

PIV13; 10th International Symposium on Particle Image Velocimetry, Delft, The Netherlands, July 1-3, 2013

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process Energy

Abstract

The present work involves the investigation of the fine scale motions in the turbulent region of a high Reynolds number air jet. In the fully developed region of the jets, the small scales of turbulence are assumed to be isotropic, and expected to contain elongated vortices (worms), whose diameter scales with the Kolmogorov length scale. Aimed at capturing the worms, a long-range ?PIV system is developed. The main design parameters of the PIV experiment are set on the basis of a hot-wire characterization of the flow. Furthermore, a benchmark hot-wire acquisition allows a validation of the present ?PIV measurements, by comparison of the main statistics. In the implementation of the measurement technique, the low concentration of seeding particles and the short depth of focus represent both the main challenges. Eventually, instantaneous vector maps from PIV measurements are presented, where the dissipative small scale structures are resolved.

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