Numerical Simulation And Hydraulic Performance Study In The Flow Field Of Stamping Multistage Centrifugal Pump

Compared with the foundary pump, the stamping multistage centrifugal pump which is made with stamping and welding crafts is more energy-saving, material-saving, environmentally friendly and efficient. The nice appearance and light weight are the advantages of the stamping pump. Moreover, the stamping craft solves the problem that it is hard to produce the same pump of low or super low specific speed with foundary craft. Also, the mechanization and automation produce of stamping pump are more easily implemented than foundary pump. In addition, the stamping pump is better than the foundary pump in hydraulic performance. As no research of whole stamping….is accomplished so far, the research of stamping multistage centrifugal pump is very important for improving the performance of pump.The combination of numercial simulation and experimental study not only figures out the external characteristic parameter of DL16 stamping multistage centrifugal pump, but also confirms the veracity of numerical simulation by comparing the results of simulation and experiment.The conclusions of the dissertation are shown below:(1) The operation, structure, advantage and status quo of stamping multistage centrifugal pump at home and abroad is summarized. The development of commercial CFD software and the basic numerical simulation theory of turbulent fluid with control equation, turbulent model, discrete method and boundary condition are introduced. By comparing different models, the math…..is confirmed and the basic equation, calculation formula and numerical method is concluded.(2) The three-dimensional model of stamping multistage centrifugal pump is built by designing the main sizes of impeller, diffuser and pump casing. The grid division of different flow fields is done with ICEM software. The inside flow field of stamping multistage centrifugal pump simulated by CFX software is aimed at concluding the pressure and velocity distribution in steady state and analyzing the changes of pressure and velocity in six rotating periods and six points in the fifth period in tansient state. Then the results how the total pressure and velocity changes as time passes are obtained.(3) The external characteristic parameter of stamping multistage centrifugal pump is first tested with experimental equipment, and then compared with the predictive curves of numerical simulation to analyze how the predictive curves change with the flux, and to find out why the error between the experiment and simulation exists, which are very essential in improving the performance of the centrifugal pump.(4) The optimal turbulent model has been worked out by comparing the external characteristic parameters of stamping multistage centrifugal pump in different turbulent models.