Numerical Simulation And Optimization Of Swirling Jet Negative Pressure Sand Cleaning Tool

With the development of the computational technology and the theory of computational fluid dynamics, numerical simulation has been an impotant method for the optimization of the fluid mechanics. This thesis focused on the newly developed swirling jet negative pressure sand cleaning tool. Using the method of numerical simulation, optimized the geometric configuration of the tool. The core component of the tool are the swirling jet nozzle and the jet pump. From the basic characteristics equation of jet pump and geometry analysis can be seen, flow ratio, area ratio, distance between power flow inlet and entrance to mixing throat and length of mixing throat are the main factors of jet pump efficiency . With the method of the numerical simulation, optimized the jet pump with impeller, gave the optimal distance between power flow inlet and entrance to mixing throat, optimal length of mixing throat and the relationship between optimal flow ratio and the area ratio. Simulating the full-size swirling jet negative pressure sand cleaning tool, obtained the single-phase/two-phase distribution of the interior of the tool, optimized the optimal angle of the secondary flow tube and the area ratio. the simulation results and experimental results were compared to verify that the correctness of the simulation results.It's the first time that simulating and optimization the jet pump with impeller, and two-phase simulation the sand cleaning tool. The results is very important to the design of the tool, shorten the period of the design, and save the cost.