3-D Modeling And CFD Simulation Of The Solid-Liquid Two-Phase Flow Field Of Slurry Pump

This subject comes from the improvement projects of 150ZGB slurry pump which is used in Mining Co. of Pansteel.There are some serious problems when the slurry pump run in the working conditions,such as wear-corrosion at local parts,low efficiency and noise,especially the wear-corrosion of the flow-parts which caused a lot of waste of energy and equipment.The most important factors for the wear-corrosion of the flow-parts are the pumping inner liquid flow characteristics when transporting the liquid medium.Therefore,it is very important to analyse the inner flow field characteristics of slurry for predicting the wear-corrosion of the flow-parts. In the dissertation, the inner three-dimensional flow field of the 150ZGB-type slurry pump were simulated for CFD simulations and reach conclusion of the external characteristics and the inner liquid flow characteristics when transporting the water and solid-liquid two-phase mediumIn this dissertation,thel50ZGB type slurry pump has been taken as an example.Firstly, the three-dimensional geometric solid model has been made by Pro/E and meshed into unstructured grids with Gambit software.Then the inner three-dimensional flow field of the pump were simulated for CFD simulation by using Fluent software when transporting the water medium or solid-liquid two-phase medium with different particle parameters(particle diameter and volume concentration).During the simulation,the Reynolds Average N-S equation,standard k-εturbulence model and SIMPLEC algorithm were adopted and the results obtained the external characteristics and the inner liquid flow characteristics such as the pressure-distribution,veloeity-distribution,solid-Phase concentration distribution and particle track.In this dissertation,simulation results were analyzed.Analysis of the distribution of speed and pressure at the cavity and blade surface as well as the external characteristics of the pump when the media is water.Analysis showed that the fluid velocity grows along the radial direction in the cavity and the back flow appears seriously around the tongue;the pressure at working face of blade is bigger than the non-working face.Besides that,the calculation results of the external characteristics are agreement with those of the experiment. Analysis of the the impact on the external characteristics and inner liquid flow characteristics of the pump when transporting the solid-liquid two-phase medium with different particle diameter and volume concentration Analysis showed that the pump head and efficiency decrease as the particle diameter or particle volume concentration increasing, but the power increases;the pressure of blade surface increases along the radial direction and the negative pressure appears near inlet district;the distribution of solid particle at working face of blade grows along the radial direction and most near inlet district,but at the non-working face the maximum appears near the quarter district of outlet.Analysis of the distribution of velocity and pressure,solid particle distribution, particle track when pumping the solid-liquid two-phase medium with different particle parameters and then researched their impact on wear-corrosion of impeller.The results of research can offer a theoretical reference to predict the wear-corrosion of flow-parts and explain the position distribution of wear-corrosion reasonablely,they also can provide a theoretical basis for improving wear-resistance performance and structural design of slurry pump...