Study on Fluid Radial Force in Six-Stage Deep-Sea Lifting Pump

摘要

Deep-sea lifting pump is a key equipment of deep-sea mining system. The internal unsteady fluid radial force may cause vibration of the pump and even bring harm to the entire mining system. The paper takes the six-stage deep-sea lifting pump being developed in China as the research object and the internal flow law and fluid radial force of the pump are studied based on numerical simulation. Firstly, the accuracy of the numerical simulation method adopted in this paper is verified by taking the domestic two-stage deep-sea lifting pump as the test object. Then, the numerical calculation of the six-stage deep-sea lifting pump is carried out, and the pressure distribution cloud map in the six-stage deep-sea lifting pump and the fluid radial force in each stage pump are obtained. The analysis results show that the rotor-stator interaction between the impeller and the guide vanes is an important reason for the fluid radial force in the pump; the fluid radial force in each stage pump changes periodically, and it is more regular in the final stage. The variation period of the fluid radial force in each stage pump is related to the number of blades of the impeller. The research results provide a theoretical basis for revealing the flow law and fluid radial force characteristics in the deep-sea lifting pump.