期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 49, 期 -, 页码 11-17出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2014.05.012
关键词
Mixing layer; Mixing layer turbulence; Swirl; High-speed piv
The near field of a 2.14 x 10(5) Reynolds number, low-Mach-number, cylindrical jet with and without swirl has been investigated by high-speed stereo PIV in a transverse plane, two diameters downstream of the jet exit. Using spatiotemporal correlations, we investigate the dynamics of streamwise vorticity in the shear layer, responsible for the mixing properties of the jet, and show how swirl affects this vorticity. A dynamical scenario is proposed, which explains how the mean shear and the azimuthal m = 0 vortices contribute to the spatial organization observed. (C) 2014 Elsevier Inc. All rights reserved.
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