Zhivotovski B.A., Ponomarev N.K. - Improvement of Hydraulic Calculation of Mine Vortical Spillway

Written by Erkin Turdibaev

Tuesday, 11 April 2017

The design of a vortex mine spillway is connected with high pressures and speeds of a waste stream. In these conditions there is a danger of washout of the course of the lower byef and cavitational destructions of concrete surfaces of constructions. Under these conditions, there is a risk washout lower pool channel and cavitation damage concrete surfaces structures. To deal effectively with these phenomena should be used flow, which would have properties that help to eliminate these problems. Such flow in the vortex mine spillway is longitudinally circulating flow, which may create artificial means giving axial rotational flow velocity component using the the swirler. In calculating and modeling of vortex systems with longitudinally-circulating flows used criterial ratio: the number of spin Heeger-Baer, option twist on Givotovsky, number Abramovich and others. Proposed dependence of the number Abramovich from the parameter of the spin by Zhivotovsky. Failure to account for the effect of the steam-core can lead to unreliable results of calculation. The analysis shows that the damping of the spin in the flow with air core occurs less intensively than in streams without an air core. In calculating pressure on the wall of the flow path of a water vortex spillway as the main method is recommended to take a method of changing the flow of angular momentum, as the most severe. The presence of reverse flow in the form of a recirculation zone formed in the longitudinally circulating flow immediately after the swirl at high swirling intensity, reduces the discharge coefficient and the capacity of the spillway. Operating experience vortex spillway at HPP Teri allows positively evaluate new engineering solutions incorporated in a basis of its design and give an optimistic assessment of the prospects for the use of similar solutions in creating high-pressure hydro spillway structures. Download (in Russian) (pdf, 980 kB)  Source: http://cyberleninka.ru/

 

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