Analysis of Siphon Formation Process of Siphon Outlet in High Lift Pump Station
To study the siphon formation process of siphon outlet in high lift pump station,taking the outlet channel and outlet pool of a high lift pump station as the research object,the three-dimensional model was established to the sim-ulate siphon flow change by using Fluent.The VOF model was used to calculate the pressure,flow rate and other param-eters of the three outlet water levels.The original angle of the hump segment was 150°at the front and 160°at the back.The vacuum failure valve of DN350 was used at the top of the siphon segment,and the angle of the hump segment was changed for optimization.It was found that after increasing the angle of the front segment by 10°,the siphon formation time was 448 s,which was 56 s shorter than that before optimization,and the starting process of the pump was improved.It is found that the pressure distribution of siphon formation at different water levels is more uniform.When the water level is low,the flow velocity is unevenly distributed and bad flow pattern is generated.The negative influence of low wa-ter level is much greater than that of high water level.Installing DN350 vacuum valve in hump section can reduce hydrau-lic loss,which promotes siphon formation.The vacuum valve will affect the flow velocity distribution at the typical sec-tion,resulting in a high flow velocity zone.When the water level of the outlet pool is low,this phenomenon will cause uneven flow velocity distribution.
high liftsiphon outlet pipegas-liquid two-phase flowsiphon formation timenumerical simulation
NETL
NSTL
万方数据
维普
