In The Process Of Emulsion Pump Suction Fluid Visualization Research

In order to meet the needs of fully mechanized coal mining face rapidmoving support requirements, it raised very tall requirement to high pressure,large flow of mine emulsion pump performance. Pump head flow state of liquidpump have great influence on working performance of emulsion pump, whilethe traditional test method is difficult to get the work process pressure, rotatespeed and other velocity of flow field informations. Based on the RBW330/31.5type three plunger emulsified liquid pump as the research object, the applicationof CFD software to emulsion pump suction process research, the internal flowfield implement pump flow visualization, it provides a new research method toemulsion pump design and performance analysis. The main research content andconclusion:Through the dynamic calculation of CFD of internal flowpath of pumpmodel, obtained each moment of the pressure and the velocity distribution of theimage of the emulsion pump single suction pump head cavity of,realizing thepump suction process visualization. According to the results of the image: itcauses the acceleration of liquid pressure loss when the piston start, and whenthe piston reaches the maximum speed, Piston end face and the nearby areascould form hydraulic impact.According to the actual size of the the pump internal flow channel,settinga model of the pump internal flow channel,after simplifying the corner andcomplex shapes, it could get the calculation regional model of the pump. Importthe model into Gambit and mesh it. In order to improve the grid quality andmesh expediently, the overall calculation model regional was cut intoindependent sub-regional models which can exchange the flow informationbetween each other, and then each independent sub-regional model was meshedgrid. Due to the complexity of the boundary shape lead to complex chaotic flowpattern, it does some grid refinement near the spool and set the appropriateboundary conditions in order to meet the calculation accuracy. It is a dynamicprocess simulation of the liquid absorption process which realize position changing of the boundary of piston end and spool boundary. The dynamicmesh technology will be used, and the UDF program which translate and editinto FLUENT software will be need to control the boundary of piston end andspool boundary movement. After all,using the Post-processing software,it canget the static pressure and velocity distribution of the process of suction atvarious moments.Chang the half-cone angle, speed and size of the suction spring stiffness ofthe suction spool of RBW330/31.5three plungers emulsion pump, respectivelydo the dynamic simulation and visualization processor. The following results canbe obtained by comparing those images:①The half-cone angle of suction spool has little effect on the accelerationloss of hydraulic energy; it will cause maximal hydraulic shock when thehalf-cone angle is60°.②The acceleration loss of hydraulic energy and hydraulic shock willincrease as the pump rotate speed increases.③Spring stiffness has little effect on the acceleration loss of pumphydraulic energy. The actual spring stiffness of the pump will cause biggishhydraulic impact.