Blade wear is the critical problem in the operation of multiphase pump. This paper presents a numerical study of the multiphase flow of multiphase pump. The trajectory of particles in the pump is calculated by the discrete phase model. Then, the simulation results are compared with the model test results of the pump to verify the correctness of the simulation method. The results show that the particles in the impeller domain are mainly near the hub, and the particles in the diffuser domain form a agglomerated area in the middle of the flow channel. The average wear rate of the impeller is more affected by the particle size than that of the diffuser. The maximum wear rate of blade surface increases first and then decreases with the increase of particle size. According to the wear data under different particle sizes, the regression model between particle size and wear rate is fitted to predict the wear of mixed transport pump in actual operation. The research results have important reference value for the prediction of the wear performance of the multiphase pump.

To reduce the flow-induced noise of centrifugal pumps and reveal the noise source characteristics inside the pumps, this paper designs a bionic blade based on the “tubercle effect” of humpback whales. The noise reduction effect of the improved structure is verified through numerical simulations of the flow and acoustic fields of the prototype pump and bionic pump. Using the Ffowcs Williams–Hawkings equation and Powell vortex sound equation, the reasons for the noise reduction are explained from the perspective of pressure pulsation and sound source. The results indicate that the bionic blade has little impact on the hydraulic performance of the centrifugal pump but can achieve a maximum noise reduction of 2.53 dB. The main sources of centrifugal pump noise are the severe pressure pulsation caused by rotor–stator interaction and the sound source generated by the influence of velocity on vortices. The reduction in pressure pulsation intensity, sound source, sound source intensity, and sound source standard deviation are the main reasons the bionic pump has lower noise than the prototype pump. However, the relationship between the magnitude of pressure pulsation intensity and dipole noise amplitude is not simply linear. The total sound pressure level reduction effect caused by suppressing the pressure pulsation whose main frequency is the blade passing frequency is significantly larger than that caused by suppressing the pressure pulsation whose main frequency is the shaft frequency.