Study on eddy-prevention in pump station sump with a new combination of symmetric cochlear shell type and diversion cone
In order to verify the effectiveness of the axial pump station eddy-prevention,the full-field CFD nu-merical simulation was studied,focusing on the wall vortex formed behind the closed sump and the bottom velocity singularity area at the bottom of the horn mouth.A new combination of symmetric cochlear shell type and diversion cone were proposed and optimized.Numerical simulation results show that symmetric cochlear shell type improves the efficiency and velocity uniformity and the diversion cone can effectively occupy the water flow singularity area and guide the water flow into the horn mouth.In order to prevent the wall vortex,the single factor control variable method was used to study the eddy-prevention and elimination.It has been found that the symmetrical cochlear shell type wall has a more prominent effect on efficiency and velocity uniformity.To prevent the bottom-attached vortex,the diversion cone was adopted as a preventive measure and the ratio of height to diameter of the diversion cone is optimized.The corresponding research results have been applied to the Guishanzha pump station project in Zhenjiang,with good eddy-prevention function.
numerical simulationmodel testpump unit efficiencyvelocity uniformityeddy-prevention
万方数据
维普
