Study of Numerical Simulation on Internal Flow Field in Geometry of Nozzle with Water Jet

A three-dimensional mathematical model of internal flow field in a coal bed bore-enlarged nozzle was established with the CFD software.Using the standard k-eturbulent model,the internal flow field in the nozzle was simulated and the influence of nozzle parameters on the outlet axial velocity of the flow field was studied.The results show that the contracted angle and length-diameter ratio of the nozzle influence the internal flow field more.The optimum values of all these parameters were proved to exist.Simulated results close to indoor test results,which accounts for the relationship between the internal flow field distribution in the nozzle and the coal bed impact effect of water jet.