Study on Structural Parameter Optimization and Numerical Simulation of Organ Pipe Nozzle

Cavitation jet has a broad application prospect in engineering fields such as cleaning and descaling, oil drilling and so on. In order to study the influence of different outlet structures on the internal and external flow field characteristics of nozzles, this paper adopts numerical simulation methods to obtain the contour and curve diagrams of the flow field distribution of the nozzle under different working conditions by taking the diffusion angle and the length of diffusion section as the design variables. It is found that the cavitation bubble is initially formed on the wall of the cylindrical section and fully developed in the diffusion section. The nozzle velocity forms a constant velocity core of a certain length in the axial direction, but shows a symmetrical distribution in the radial direction, and the jet velocity decreases with the increase of the radial distance. The values of the diffusion angle and the length of the diffusion section have a significant influence on the cavitation jet, and the reasonable selection of the design variable is helpful to improve the effect of the cavitation jet. The cavitation performance of the nozzle is the best when α = 50° and L2 = 6.0 mm.