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Simultaneous measurement of turbulent velocity field and surface wave amplitude in the initial stage of an open-channel flow by PIV
Authors:F -C Li  Y Kawaguchi  T Segawa  K Suga
Institution:(1) Turbomachinery Group, Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Namiki 1-2-1, Tsukuba 305-8564, Japan;(2) Toyota Central R & D Labs Inc., Nagakute, Aichi 480-1192, Japan;(3) Present address: 2nd Department, Institute of Industrial Science, The University of Tokyo, De504 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Abstract:Particle image velocimetry (PIV) was employed to measure the two components of the turbulent velocity field in the initial stage of an open-channel flow in a streamwise-wall-normal plane, and the free-surface level was discriminated from the PIV image. The details of this technique was described and demonstrated by showing the instantaneous velocity field together with the free-surface shape, statistics of velocity field, and the wave-turbulence interaction terms. Preliminary experimental results showed that the turbulence intensity of the streamwise velocity fluctuations (u′) decreased, whereas that of the wall-normal velocity (v′) increased near the bottom wall with downstream distance in the initial stage of an open-channel flow; $$\overline {ug}$$ (g is the fluctuation of free-surface level) had a negative value, $$\overline {vg}$$ had a positive value near the free surface, and the surface-wave-affected depth deepened with downstream distance.
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