Hits:

Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:水利水电技术

Volume:48

Issue:11

Page Number:7-12,25

ISSN No.:1000-0860

Abstract:In order to study the influential factors of the air-core vortex occurs in front of the gate caused by partial opening of radial gate,the relevant experimental study and theoretical analysis are made with the 1 ∶ 20 hydraulic model by taking one of the orifices of a sluice gate as the study objective.The study result shows that the occurrence of the air-core vortex in front of the gate is related to the water depth,opening of gate,circulation of inflow,surface tension and viscous force in front of the gate.It is obtained from the experimental observation and theoretical analysis concerned that there are two critical submergence depths (the upper and the lower) for the vortex in front of the gate.When the water depth in front of the gate is between the upper and lower limits of the two critical submergence depths,the air-core vortex occurs.When the radial gate is partly opened,the larger the opening is,the smaller the aspect ratio of the inlet of the gate is to be and the stronger the air-core vortex is to be,while the more obvious the circulation effect from the boundary condition of the inflow is,the stronger the vortex is to be.When the Reynolds number Re ≥4.4 × 104 and the Weber number We ≥ (104 × 208),the effects of viscous force and surface tension on the experiment can be neglected.Finally,a critical submergence depth formula,for which only the aspect ratio of the gate inlet and the number of the circulation are considered,is established through the theoretical analysis concerned.

Note:新增回溯数据