Study On Analysis And Behaviors Of High-Ressure Multi-stage Centrifugal Pump

As rotating machinery are used widely and become large-capacity, the stabilization and dynamics of rotating rotor were influenced by the increasing in coupled interaction between the fluid and the rotor.In this paper, the high-power high-pressure multi-stage centrifugal pump is regarded as investigate object. The theoretical analysis and experimental research on the generation mechanism of the ring sealing force set between multi-stage centrifugal and characteristics of ring sealing are studied according as coupled interaction between the fluid and the rotor.Through three-dimensional flow field simulation of the multi-stage centrifugal pump the performance of centrifugal pump is predicted. Some important flow Phenomena are got. The velocity and pressure distributions within the impellers, guide vanes, et al. are analyzed so that the later calculation on the critical speed can be continued.Based on Navier-Stokes equations, the seal dynamic model is established. o. Detailed derivation calculate multi-stage centrifugal pump interstage ring pressure seal dynamic coefficients of the method, and large amount of computation is verified by the above model and algorithm, and a number the reaction of sealing parameters on dynamic characteristics of sealing are analyzed.Based on the finite element method of high-power multi-stage centrifugal pump rotor dynamics model is established. Firstly, the establishment of the rotor shaft of the finite element model, introduced linearized oil-film force and the sealing force model, given the multi-stage centrifugal pump rotor sound "wet" state kinetic analysis. And the rotor rigid design theory and methods of high-power high-pressure multistage centrifugal pump is established.In the country, a multi-stage rotor "wet" effect bench is established firstly. The sealing force on the vibration characteristics of the rotor system is studied. Through test results, analyzing the influence factor of sealing force to the rotor system dynamics characteristics. Finally, the results of theoretical analysis and experimental results were compared.In this paper, the study shows the influence of the inter-stage seal on the rotor dynamic characteristics of multi-stage through the test results. A numerical simulation methodology is initially established, which provides a theoretical basis for development and optimization of high-pressure centrifugal pump, and has important theoretical significance and practical value.