Natural aeration method capable of avoiding ship lock valve segment sudden shape type drop sill cavitation

Abstract

The invention belongs to the technical field of water conservancy, and is a natural ventilation method capable of reducing the cavitation of the sudden expansion of the valve section of the ship lock. The starting point of the first step, and the first step of the step-shaped sill connects with the second step through a downward curved surface after the horizontal plane, and at the same time, a ventilation system is added at the position where the water flow of the step-shaped sill separates for natural ventilation . With the optimized step-shaped sill and reasonable pipeline layout, the sill can realize natural ventilation, and the aerated water flow effectively protects the area where the water flow separation occurred in the original vertical sill, covering the cavitation collapse area of ​​the original sill, and It can also cover a distance from the front end of the sill to the inspection door well, which can protect the bottom plate of the sudden expansion body to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of water conservancy, and relates to a method for anti-cavitation of a ship lock valve, in particular to a natural ventilation method capable of reducing cavitation caused by sudden expansion of the ship lock valve section. Background technique [0002] With the development of the shipping industry and the improvement of the valve research level, the ship lock is entering a period of high water head, and "high water head and large flow" are the main characteristics of the current ship lock. At present, there are more than 50 ship locks with a water head exceeding 20m that have been built or are under construction in my country. Among them, the water head of Caojie Ship Lock is 26.7 meters high, the water head of Yinpan is as high as 36.46 meters, and the maximum water head of Three Gorges Ship Lock is as high as 45.2 meters. [0003] As far as the ship lock is concerned, the water delivery valve is regarded...

AI Technical Summary

Problems solved by technology

For falling sill ventilation, the natural ventilation of the falling sill can only be realized in some small opening ranges, and it cannot be guaranteed to realize natural ventilation in all openings where cavitation occurs in the falling sill. The measure of forced ventilation was once adopted and achieved certain results. However, forced ventilation must be equipped with an air pump, which increases the engineering investment and has many inconveniences in operation management

How to solve this problem has become a matter of great concern to design and scientific research personnel, especially for the natural ventilation of falling ridges to reduce cavitation, there are few successful precedents at home and abroad

Images