Three-dimensional Numerical Simulation Of Discharge Of Floodgate Of Tubular Hydropower Station

In this paper,the tubular hydropower station on the main stream of the Yellow River is taken as the research object,and the three-dimensional model of the sluice is established.The numerical calculation uses the standard turbulence model k-?,using the VOF model to track the free water surface.The results of this paper are as follows:(1)This paper introduces the relevant theories of computational fluid dynamics and numerical simulation.The three-dimensional model of flood discharge gate is established by UG.The fluid domain is obtained.The model is solved by Fluent.The Reynods equation is closed by the Standard k-? turbulence model.Free water surface,the calculation results are imported into CFD-post for data processing.(2)Simulating flood discharge flow field of sluice in four working conditions,flood frequency of 20%,flood frequency of 3.33%,design flood,and check flood?Comparing the calculated value with the measured value,it is found that the discharge capacity,water surface line,pressure and flow rate are in good agreement.(3)According to the operation mode of the hydropower plant,three kinds of gate opening schemes are adopted: the first schemes No.1 and No.5 gates are fully open,the No.3 gates are partially opened by 2.8 m;the second scheme No.3 gates are all open,No.2 and No.4 gate is partially opened 3.1m;the third scheme is opened 8.2m in the gates of No.2 and No.4,and the rest of the gates are closed.Comparing the three schemes,it is concluded that the gates No.1 and No.5 are fully open,and when the gate of No.3 is partially opened by 2.8 m,the change of the water surface line is relatively stable,and the pressure at the front end and the end of the stilling basin is small,which is caused by the structure of the stilling basin.The generated kinetic energy is small,and the downstream scouring is relatively small.It is recommended that under frequent flood conditions,the gates of No.1 and No.5 are fully opened,and the gate of No.3 is partially opened by 2.8 m.The research results can provide reference for the design and operation of actual projects.