Numerical Simulation and Verification of Cavitation Behavior in Water-jet Cavitation Peening Processing

Water-jet cavitation peening is a new technology for surface modification of metallic materials.The cavitation behavior of the processes involve in the complex and changeable physics phenomenon such as high-speed,high pressure,multiphase,phase transition,turbulence,unsteady features,cavitation behavior and impact pressure distribution in this process has always been the key problem in the field.The flow field characteristics of submerged cavitating water jet nozzle inside and outside is simulated in FLUENT6.3 software,and the velocity,static pressure and cavity density in flow field is obtained,and the Fujifilm pressure-sensitive paper is used to measure the distribution of the impact pressure along the jet direction in the water-jet cavitations peening processing.The results show that submerged cavitating jets occur cavitation in the convergent-divergent nozzle,the shock wave pressure induced by the bubble group collapse is up to 300 MPa.