Library Subscription: Guest
Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

THREE DIMENSIONALITY IN THE NEAR FIELD OF A ROUND JET

pages 135-140
DOI: 10.1615/TSFP2.960
Get accessGet access

ABSTRACT

A round air jet (Re = 16000) was studied using Stereo PIV techniques to understand the characteristics of all three velocity components in the developing shear layer and to study the evolution of three dimensionality with increasing axial distance. Pulsed laser sheets were aligned to illuminate the centerline plane of the jet. The stereo PIV setup was suitably calibrated to translate the resulting pixel displacements into axial, radial, and azimuthal velocity components. The RMS of the azimuthal velocity is of the order of 0.1 V0 in the shear layer downstream of Y/D ~ 0.5. This is significantly earlier than reported in previous studies. Individual fields show that both vortex cores and braids are three dimensional. However, the initial azimuthal perturbations typically were associated with straining regions immediately upstream of the first vortex ring that formed.

Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections Prices and Subscription Policies Begell House Contact Us Language English 中文 Русский Português German French Spain