Turbulent intensity and scales of turbulence after hydraulic jump in rectangular channel
Journal Title: Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation - Year 2016, Vol 48, Issue 2
Abstract
Experimental research was undertaken to investigate the changes in spatial turbulence intensity and scales of turbulent eddies (macroeddies) in a rectangular channel and the influence of the hydraulic jump on vertical, lateral and streamwise distributions of relative turbulence dntensity and scales of turbulent eddies. The results of three tests for different discharges are presented. An intensive turbulent mixing that arises as a result of a hydraulic jump has a significant effect on instantaneous velocity, turbulent intensities and sizes of eddies, as well as their vertical and longitudinal distributions. In the analysed case the most noticeable changes appeared up to 0.5 m downstream the hydraulic jump. In the vertical dimension such an effect was especially seen near the surface. The smallest streamwise sizes of macroeddies were present near the surface, maximum at the depth of z/h = 0.6 and from that point sizes were d ecreasing towards the bottom. The intensive turbulent mixing within the hydraulic jump generates macroeddies of small sizes.
Authors and Affiliations
Adam Kozioł, Janusz Urbański, Adam Kiczko, Marcin Krukowski, Piotr Siwicki
Keywords
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- EP ID EP164836
- DOI 10.1515/sggw-2016-0008
- Views 123
- Downloads 0
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