In order to explore its applicability under high water head and large discharge conditions,based on a hy-draulic model test of vertical vortex shaft spillway,this paper focused on vortex chamber backwater and the fluctuating pressure of the shaft bottom in different convergence section,and optimized the shape of convergence section of the di-version canal section and the vortex chamber,as well as the shaft and diversion tunnel.Then,due to the limitation of the traditional model test for the measurement of the complex hydraulic characteristics of vertical shaft spillway,based on VOF method,different k-ε turbulent model and were adopted to simulate the flow of the optimized vortex shaft spillway.The simulation results indicated that Realizable k-ε turbulence model can better simulate the hydraulic characteristic of cavity gyrating flow with super high water-head,high velocity,strong rotary with free surface.The thickness of the rotating flow in shaft was uneven distributed.In the mainstream area,the thickness of the water was thicker than that of the non-mainstream.The attenuation gradient of tangential velocity of the rotating flow was gradual-ly reduced from top to bottom.In the upper part of the shaft potential energy,with the decrease of potential energy,the axial velocity in the upper part of the shaft increased rapidly.When reaching the middle and lower part of the shaft,the axial velocity of the rotating flow in the mainstream area was still increasing rapidly.But to the non-mainstream are-a,the axial velocity of the rotating flow increased slowly.Energy dissipation in vertical vortex spillway differed in dif-ferent parts.The upper part of shaft mainly eliminated the tangential kinetic energy of rotational flow;the middle part of the shaft mainly eliminated the axial energy of rotational flow;the lower part mainly used the annular hydraulic jump and water cushion to eliminate most of the residual kinetic energy of flow.
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