Numerical Simulation Of Three-Dimensional Flow Field In The Slurry Pump With Lateral Inlet

Slurry pumps are widely used in various industries because of their special applications.However,in practical applications,the problem of short sealing effective time and poor sealing effect of slurry pumps has not been effectively solved,which not only causes a lot of material resources and financial losses,but also threaten the safety of the operators life.Therefore,it is very important to study the slurry pump with better shaft sealing performance and promote the independent research and development of key equipment.In this paper,from the perspective of the shaft seal problem solved,the slurry pump with lateral inlet structure is designed.In order to carry out the comparative study of the lateral inlet slurry pump and the traditional axial inlet slurry pump,the computer modeling and three-dimensional flow path modeling of two different structural slurry pumps were carried out by computer aided design.Then the numerical simulation was used to compare the water performance of the two structural slurry pumps.The comparison between the performance of the two slurry pumps and the 250ZJ-I-A75 slurry pump performance table and the performance curve confirmed the accuracy of the simulation.Finally,the solid phase concentration distribution in the slurry pump under multi-phase flow conditions was simulated,and the wear law of the over-flow components in the slurry pump was analyzed.The research results have important significance for the application and development of slurry pumps.The main research work and research conclusions of this paper are as follows:1.The status quo of application research of slurry pump in China is analyzed.The structural difference between axial inlet slurry pump and lateral inlet slurry pump is compared.The causes of axial seal failure of axial inlet slurry pump are analyzed.The slurry pump is hydraulically designed and structurally designed.2.Three-dimensional modeling of the two slurry pump full flow channels was designed by using SolidWorks software,and the 3D water body model was imported into ICEM software to mesh it.Using the same working conditions as the 250ZJ-I-A75 slurry pump water performance table,the three-dimensional numerical simulation calculation of the full inlet flow of the lateral inlet slurry pump in the FLUENT software is carried out,and the parameters such as pressure and speed are used.The distribution law was analyzed.The results show that(1)the flow field at the shaft seal of the lateral inlet slurry pump is far more stable than that at the shaft seal of the axial inlet slurry pump,and the lateral inlet structure can fundamentally solve the problem of shaft seal leakage.(2)At the same radius,the pressure of the blade working face is higher than the non-working face of the blade.As the radial distance increases,the pressure and velocity in the main blade and the guide vane increase.(3)Relative to the flow rate,the influence of the rotational speed on the pressure inside the volute is greater.As the flow increases,the pressure in the volute does not increase but the area of the high pressure area increases.3.The hydraulic characteristics of 3 pairs of lateral inlet slurry pump and axial inlet slurry pump under the same working conditions were compared.The results show that the performance curves of the two structural slurry pumps are basically the same.The performance of the lateral inlet slurry pump is lower than that of the axial inlet slurry pump,but it is within the acceptable range.4.The distribution law of solid phase concentration in slurry pump under solidliquid two-phase flow condition was studied,and the wear law of over-flow component of slurry pump was explored.The results show that(1)the solid phase concentration in the lateral inlet section where the fluid crosses the axis collision is high,and wear is likely to occur at this position.(2)The inlet and outlet positions of the blade are easy to wear areas.Compared with the axial inlet slurry pump,the solid particles in the lateral inlet slurry pump are more evenly distributed in the impeller,and the solid phase concentration of the non-working surface of the blade is higher than that of the blade working surface.(3)The solid phase concentration along the outer wall surface of the volute to the outlet pipe is relatively high,and the region is a position prone to wear.