Bidirectional inflow whirling current type shaft facility for flood discharge and energy dissipation in dam

Abstract

The invention relates to a bidirectional inflow whirling current type shaft facility for flood discharge and energy dissipation in a dam, and aims to solve the problems of small flood discharge volume, low energy dissipation efficiency, difficult aeration of wall surfaces and strong shaft vibration of the existing whirling current shafts in high dams with high water head and flow. A volute chamber is communicated with feed canals through a water inlet on the volute chamber, water outlets of the two feed canals are symmetrically arranged on left and right sides of the volute chamber in an opposite direction, currents entering into the volute chamber from the two feed canals form a 180-degree included angle, the volute chamber is provided with an air vent at the upper end and a transition section at the lower end, a shaft section is connected to the lower end of the transition section and provided with a plurality of sections of hole blocking bodies which are arranged at an interval, a water pillow pool is arranged at the bottom of the shaft section, and a water outlet section communicating with the shaft section is arranged at the upper end of the water pillow pool. According to the shaft facility, the water inlets of the volute chamber are bidirectional and form 180 degrees so as to increase the flood discharge capacity; and the shaft is designed into a whirling current type energy dissipater provided with hole blocking bodies arranged at an interval so as to increase the energy dissipation efficiency of the currents, avoid cavitation damage and cavitation problems of the existing whirling current shafts, and reduce the shaft vibration simultaneously.

Description

technical field [0001] The invention relates to a swirl shaft in a water conservancy and hydropower project, in particular to a bidirectional flow-inflow swirl type shaft discharge and energy dissipation facility in a dam. Background technique [0002] There are many high dams under construction or to be constructed in China, especially dams with a height greater than 200m, which are basically built in deep mountains and canyons, where the mountains are high and the valleys are deep. The problem of flood discharge and energy dissipation is very prominent, especially the problems of discharge, energy dissipation, cavitation, cavitation, turbulent vibration and other problems of discharge structures, which are difficult to be solved urgently; swirl shaft is a new type of flood discharge and energy dissipation Facilities, the diversion channel of the swirling flow internal energy dissipator and the shaft discharge channel are not on the same longitudinal axis. Since the water f...

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Problems solved by technology

[0003] In view of the above situation, in order to solve the problem of difficult layout of flood discharge and energy dissipation facilities for high dams (high dams above 200m), and to overcome the deficiencies and shortcomings of traditional shaft energy dissipation equipment, the purpose of the present invention is to provide a two-way inflow swirl type in the dam. Shaft discharge and energy dissipation facilities to solve the problems of small discharge flow, low energy dissipation rate, difficult wall aeration, and strong shaft vibration in traditional swirling shafts with high water head and large flow rate

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