Experimental Study And Numerical Simulation Of Hytrodynamic Cavitation Reactor With Multi-Square-Hole Orifice Plates

This article is divided into two parts:(1) Systematic experimental study on different structural parameters of the multi-square-hole orifice plates with three-dimensional Particle Image Velocimetry (PIV) and other precision instruments.(2) The simulation of hydrodynamic cavitation reactor with different orifice plates by using Flow-3D.The first part of this thesis was completed through one hydrodynamic cavitation instrument which was designed by Hydraulics Laboratory of Zhejiang University of Technology. Longitudinal velocity, vertical velocity, cavitation number and the cavitation flow field of every multi-square-hole orifice plate in different flow were measured and analyzed with three-dimensional Particle Image Velocimetry, High-speed Photography and SCANIVALVE’s DSA3207Pressure Scanner. The distribution of longitudinal velocity and vertical velocity, the relationship between flow and cavitation number, the variation of cavitation number with the downstream distance were obtained. Besides, the variation of cavitation flow field with the different flow and time were also obtained from experiment.The second part was to simulate the different structural parameters of multi-square-hole orifice plates by using Flow-3D. First of all, the correctness of simulation results were verified. Then, the cavitation flow field of five different structural parameters of porous plates were simulated with different flow. The simulation results showed that:the cavitation characteristics were related to opening ratio, orifice’s shape and arrangement. The distribution of velocity and cavitation number were consistent with experimental results. Flow field and pressure of the entire computational domain could be obtained from simulation, which had important reference value for the optimization of the plate.