Research on Axial Force and Energy Balance of Seawater Desalination High-Pressure Pump-Based Whole Flow Field Numerical Calculation

This paper uses the whole flow field numerical simulation method to study the axial force and balance device of a seawater desalination pump (SDP) with high capacity and pressure. The axial force on the impeller is divided into the forces acting on the outer and inner surface and then monitored separately in the numerical calculation. The pressure distribution law of the pump chamber and blade surface of all levels of the impeller were studied to obtain the distribution law of the cover plate force, dynamic reaction force, and axial force of each stage impeller. The total axial force distribution law is summarized and found to change nonlinearly with the flow rate, and the axial force is closely related to the pump operation state. The principle of the balancing device and its internal flow state were studied. The relative error between the axial force calculated by the numerical calculation and the axial force balanced by the balance device was 6.1%. Considering the complexity of the internal flow of the balance device and the simulation error, it is possible to conclude that the balance device can better balance the axial force of the SDP.