Numerical Simulation Research of Liquid-Solid Two-Phase Flow in Abrasive Water Jet Nozzle

摘要

According to the Lagrange discrete phase model of multiphase flow,mathematical model of the abrasive water-jet(AWJ)nozzle based on the multi-phase movement was introduced,then the boundary conditions was determined and the liquid-solid turbulence which is isothermal,can not be compressed and steady-state in the cone-cylinder nozzles of the export of the pre-mixed AWJ was simulated applying the software FLUENT.The results showed that:the axial velocity and dynamic pressure of the continuous phase in the nozzle were axial symmetry notable,and at the axis had a extreme point;abrasive accelerated at two points,in front contractive segment,the rate increased rapidly,and in the back straight one,the speed accelerated slowly.The length of the cylinder is 100 mm,the diameter of the nozzle is 8 mm,and the angle of the cone is 15°.There is a extreme point of the rate at the point 10 mm in the established model.The results of simulation laid the foundation for optimizing the nozzle structure,improving efficiency and developing the nozzle.