Abstract:Based on the discrete phase model and the standard k-ε turbulence model, the flow fields in the first and second stages of a multi-stage stamping pump were numerically simulated to calculate the performance and the erosion characteristics of the over-current components under different particle mass concentrations.The particle volume fraction distribution, flow field velocity, and particle motion trajectory were analyzed to study the effects of particle parameter on erosion characteristics.The results show that with the increase of particle concentration, the single stage head and efficiency of the stamping pump are linearly attenuated.When the particle mass concentration is
90 kg/m3, the single stage head decreases by 6.89%, and the efficiency decreases by 6.95%.The erosion rate of the impeller and the vane is exponentially and positively correlated with the particle mass concentration.The erosion rate of the joint between the blade and the rear cover as well as the turning portion of the vane blade is the highest.Higher particle concentration, high impact velocities, and more frequent particle impacts are the main reason for the higher erosion rate in the above regions.
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