Application of falling-sill depth of the falling-sill bottom-flow energy dissipator in engineering optimization design
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Abstract:
This paper took the bottom-flow energy dissipator of a diversion spillway tunnel of a project as the object of study. In the original test scheme, when the gate was half open, the discharged flow was off the bottom of the discharge chute, which was not conducive to dissipating the energy of the discharged flow. In this study, we altered the slope of the floor in the pressing slope section, and reduced the two slope sections of the discharge chute into one slope section. In the original scheme, there were repelled hydraulic jumps in the stilling pool, resulting in poor energy dissipation. To tackle this problem, we adopted a calculation formula of the minimum falling-sill depth that was aimed at controlling the maximum underflow speed, and determined the elevation of the floor of the stilling pool. After two optimization experiments, we eliminated the phenomenon in which the flow out of the gate was off the bottom of the discharge chute. The discharged flow was in a steady regime. There were stable submerged jumps to dissipate the energy in the stilling pool. The water flow out of the stilling pool connected well with the downstream flow. The underflow speed and time-averaged dynamic water pressure in the stilling pool were significantly reduced. The dissipation effect was good.
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