Aerator for flat-bottomed water release structure

Abstract

The invention relates to an aeration device for a flat-bottomed drainage structure, which adopts the combination of lifting sill, aeration tank and drop sill for aeration, and installs a flow sill at the rear of the aeration tank. The contour line of the upper part of the flow sill gradually extends from the top to the bottom against the direction of the water flow. In the section where the water flow at the back of the cavity collides with the flow sill, the upper contour line of the flow sill gradually extends to the bottom along the direction of the water flow. Advantages of the present invention: (1) The angle of intersection between the jet flow and the sticking flow sill is small after passing through the ventilation groove, and it is not easy to generate backtracking water flow to block the cavity. gas efficiency; (2) Removing excess parts helps to improve the pressure distribution in the cavity and increase the area of ​​the cavity’s water-air contact surface; (3) Without changing the shape of the upstream ridge, it is equivalent to increasing the effective ridge (4) It is beneficial for the high-speed jet to discharge the accumulated water in the ventilation tank. The invention has a simple and easy structure, can reduce engineering investment, improve engineering safety, and has good application prospects.

Description

technical field [0001] The invention relates to an aeration device for a drainage structure, in particular to an aeration device for a flat-bottom drainage structure. technical background [0002] "Deep canyons, high water heads, large flows, and lots of sediment" are the main characteristics of modern water conservancy and hydropower engineering construction. With the continuous development and utilization of water resources, countries around the world have built a large number of water conservancy projects and high dams. In 2003, 108 dams over 100m in height have been built or are under construction in my country. Among them, Ertan hyperbolic arch dam is 240m high, Xiaowan hyperbolic arch dam is 292m high, and Jinping I hyperbolic arch dam will be as high as 305m. [0003] In the construction of high dams, the investment in drainage structures accounts for about 40-60% of the entire project. When the water head reaches or exceeds 100m, its flow velocity will reach or exce...

AI Technical Summary

Problems solved by technology

from Figure 5 It can be seen from the figure that the wedge-shaped body abcd forms the sill (B), if its upstream side (side ad) is vertically upward, then point a is higher than the impact point of the water tongue and the sill to a certain extent (point b), which is equivalent to reducing the effective height of the upstream ridge; the upstream side (ad) is vertically upward, which is not conducive to the air to bring out the accumulated water in the cavity; the part (abd) in the cavity is not conducive to airflow Flow, affecting the aeration effect

Images