Experimental study on influence of radial slope of suspended slab on flow field of vortex settling chamber
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Abstract:
In order to find out the influence of the change of the radial slope of overflow suspended slab on the flow field of the vortex settling chamber, through physical model tests, we used the particle image flow velocity measurement technique (PIV) to measure the three-dimensional velocities of the vortex settling chamber with the radial slope of suspended slab at 0, 0.087, 0.73, and 0.259. With consideration to the working theory of vortex settling chamber, we compared and analyzed the tangential velocity, radial velocity , vertical velocity, and streamline of each working condition. The results showed that with the increase of the radial slope of the suspended slab, the swirling intensity in the vortex settling chamber increased, the air vortex area increased, the water consumption rate decreased, the probability of sediment particles moving to the interior increased, and the possibility of deposition on the suspended slab decreased. The slope of the suspended slab had a great influence on the strength and formation position of secondary flow in the vortex settling chamber. The secondary flow was the most stable at a slope of 0.173. No secondary flow was formed when the slope was 0.259, which was not conducive to the transport of bottom sediment to the bottom hole of sediment discharge. The results of vertical velocity distribution showed that when the slope was 0.259, the vertical upward velocity of transition zone was small, and there was a minimum chance of sediment silting or overflowing . However, the vertical velocity was smaller than tangential velocity and radial velocity, and the transition zone was very small. The influence of vertical velocity on the deposition and sediment interception rate of suspended slabs was negligible.
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