Research on instantaneous flow characteristics of the falling submerged jet in a pool based on PIV technique
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Abstract:
In the past, the point measurement techniques, such as laser Doppler velocimetry( LDV) and hot2wire anemometry, or the turbulent flow numerical model with the hypothesis of the isotropy of vortex were used to investigate the turbulent flow field in a pool with an oblique submerged jet. All these methods cannot obtain the refined structure characteristics of the instan2 taneous flow field. The particle image velocimetry(PIV) was adopt to characterize the turbulent flow field in a pool with an ob2 lique submerged jet in term of the velocity, turbulent energy, and flow vorticity. T he results indicated that( 1) the refined struc 2 ture of flow fields with instantaneous and random eddies can be obtained, and the shearing and mixing between the jet and sur2 rounding water decrease the jet velocity and produce turbulent energy and vortex motion, which is the dominant mechanism for jet energy transmission and dissipation in the pool; (2)with the jet plunging into the pool, the flow rate of jet increases along the jet path, while the flow velocity and flow vorticity decrease; ( 3) in the submerged 2jet region, the velocity, turbulent energy, and flow vorticity are approximately in symmetrical distribution. The values of velocity, turbulent energy, and flow vorticity in the jet downstream are a little higher than those in the jet upstream, indicating that the downstream water is more turbulent while the upstream water is relatively stable; and( 4) in the wall 2jet region downstream, the jet continues to shear and mix with the wa 2 ter above to form the flow pattern of a submerged hydraulic jump, and the velocity, turbulent energy, and flow vorticity decrease in both the vertical and horizontal directions.
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