Influence of the blade angle of guide vane outlet on the performance of lifting electric pump in deep sea mining

In order to study the influence of different blade angle of guide vane outlet on the hydraulic performance of lifting electric pump in deep sea mining, four schemes with different blade angles of guide vane outlet were designed. Under different operating conditions, the numerical simulations were performed on the lifting electric pumps of the four schemes, and the accuracy of the numerical simulation results was verified by model tests. The results show that the efficiency and head characteristics of the lifting electric pump decrease with the blade angle of the guide vane outlet, and the area of the low speed zone of the guide vane tail increases with the increase of the blade angle of the guide vane outlet. As the blade angle of the guide vane outlet decreases, the static pressure distribution in the pump becomes more uniform, and pressure fluctuations and particle velocity fluctuations become smaller. In the four schemes, when the blade angle of the guide vane outlet is 70 degrees, the hydraulic loss of the guide vane is relatively minimal, the efficiency and head of the lifting electric pump are relatively highest, the supercharging capacity is the strongest, and the pressure field and velocity field distribution are greatly improved compared with the other blade angles.