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

DOI: 10.1615/TSFP2

EXPERIMENTAL STUDY ON INTERACTION OF ROUND JET WITH FREE SURFACE

pages 277-281
DOI: 10.1615/TSFP2.1200
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RÉSUMÉ

In this study, interaction of horizontal jet and free surface was evaluated by the experiment. Since the non-linear phenomena caused by turbulence at the free surface are fully three dimensional, three dimensional free surface shape and three-dimensional velocity distribution just beneath the surface should be simultaneously measured. Here, Stereoscopic Particle Image Velocimetry (stereo-PIV) and Specklegram Method (Tanaka et al.,2000) was combined to visualize free surface and underlying turbulence simultaneously.
The test section was a rectangular tank having a free surface. A circular nozzle was set horizontally beneath the free surface to form a jet. The jet interacted with the free surface, causing the wavy free surface condition. Three progressive CCD cameras (HITACHI KPF-110, 1024×1024[pixel], 10bit) were used in the experiment. Two cameras were set beneath the test tank to take the stereoscopic view of the turbulent jet. Three dimensional velocity distribution beneath the surface was obtained on the certain plane. Another camera was used for Specklegram Method which visualizes the three-dimensional surface shape. This optical technique enabled to measured the free surface wave quantitatively in a high accuracy. Using this quantitative surface information and velocity distribution measured by stereo-PIV, correlation between free surface fluctuation and flow field was obtained.

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