Natural ventilation method for relieving sill-lifting cavitation of high-lift ship lock sudden-enlargement gallery

Abstract

The invention relates to a method for relieving the cavitation of a high-lift ship lock sudden-enlargement gallery body type, in particular to a natural ventilation method for relieving sill-lifting cavitation of a high-lift ship lock sudden-enlargement gallery, by adopting quintic curved type sill-lifting, an air entraining groove and a wedge-shape deflecting flow sill thereof are arranged at the position of water flow separation on a sill-lifting curved surface, so as to form a stable low-pressure area; meanwhile, an air pipe is additionally arranged at the position of water flow separation, so as to realize natural ventilation and relief sill-lifting cavitation. A stable cavity can be formed at the position of the air entraining groove on the sudden-enlargement sill-lifting curved surface, so as realize stable natural ventilation of sill-lifting.

Description

technical field [0001] The invention relates to a method for reducing cavitation in a suddenly expanded corridor of a ship lock, in particular to a natural ventilation method for reducing the cavitation in the ascending sill of the suddenly expanded corridor of a ship lock with a high water head. 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 26.7m, the water head of Yinpan is as high as 36.46m, and the maximum water head of Three Gorges Ship Lock is as high as 45.2m. [0003] As far as the ship lock is concerned, the water delivery valve is its control device, and t...

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Problems solved by technology

[0004] A large number of tests and engineering practices have proved that the use of downward sudden expansion is economical and effective for reducing cavitation, but at the same time, it has also been found that this type of body shape increases the formation of sills behind the door while reducing cavitation at the bottom edge. The swirling area before the ridge and the separation area of ​​the rising ridge surface have high flow velocity and strong turbulence, and it is easy to generate a low-pressure area after the inflection point of the rising ridge surface, which leads to a certain degree of cavitation

In order to solve the problem of sill cavitation, the project generally adopts two measures: steel plate lining and sill shape optimization. The former can be considered when the opening range and strength of sill cavitation are not large, but cavitation and corrosion will occur in long-term use. Vibration phenomenon increases project maintenance costs; the latter has a wider range of applications, but its shape design is too complicated, and it will increase the length and volume of the sudden expansion corridor, thereby increasing project investment and construction difficulty

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

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