Numerical Simulation on Internal Flow Field in Cavitating Nozzle

Three-dimensional physical model and numerical model are established according to the two nozzle structures,and the κ-e turbulence model is selected to establish mathematical model,the SIMPEC arithmetic is used for simulation.The results reflect that the cavitating nozzle has the maximum velocity value in the cylindrical section,and the negative pressure is favorable for the cavitations bubble to exist in the cylindrical section because of the intensely shearing action between nozzle and surrounding medium.The cavitating effect of angle-pipe nozzle is superior to organ-pipe nozzle under the specific parameter(the cylindrical section diameter d = 1 mm,the cylindrical section length S = 3 mm,the diffuser angle section L = 8 mm,the diffuser angle θ = 30°).