Parametrical Design And Fluid-Solid Coupling Analysis Of Marine Centrifugal Pump

This paper is supported by the National Defense Pre-research Foundation for "Research on Algorithm Optimization of Rotary Fluid Machine" of CSIC No.704 Institute(2013JX598F) and the Key Laboratory Open Foundation for "Advanced Ship Design and Manufacturing Technology" of Jiangsu Province(CJ1201). As an important energy conversion device, centrifugal pump is widely used in many different fields of national economy and defense industry, so design and analysis of centrifugal pump is important to sustainable development and is of practical significance in the area of energy conservation and emission reduction. Because of complex work environment and the demanding reliability requirements etc., the requirement of marine centrifugal pump design is higher, particularly to pumps used in military equipment. This paper focuses on marine two-stage centrifugal pump, the main research contents are as follows:(1) Based on the overseas and domestic research status of CAD technology used in design of centrifugal pump, an integrated design system of marine centrifugal pump oriented design and manufacturing was studied, the processing flow and basic functional modules of the system was given.(2) Hydraulic design module of impeller was completed by using VB based on the method of speed coefficients; After comprehensive analysis of modeling method for marine two-stage centrifugal pump impeller, by utilizing secondary development UG/Open technology, impeller parametric modeling completed and software developed, which laid a solid foundation for internal flow’s numerical simulation, fluid-solid coupling dynamic characteristics analysis and structure optimization.(3) Based on the parametric model of marine two-stage centrifugal pump internal flow water body, the mesh work of internal flow was completed with Hyper Mesh. On the basis of SST k?? turbulence model, ANSYS14.5 CFX module was used to the steady numerical simulation of marine two-stage centrifugal pump internal flow under different operation conditions. The velocity distribution and pressure distribution of internal flow under different operating conditions was analyzed comprehensively, performance curve of the centrifugal pump predicted, the correctness and rationality of numerical simulation was verified by experiment.(4) The effect of different loading to the rotor was discussed, and found that hydraulic load is the main reason which affects rotor dynamic characteristics. Based on the one-way fluid-solid coupling theory, the analytical framework was established by using Workbench14.5 analysis of fluid-solid coupling module(FSI: Fluid Flow CFX-Static Structural), load the water pressure derived from the steady numerical simulation of marine two-stage centrifugal pump internal flow under different operating conditions on the rotor. The stress and strain of rotor was analyzed, compared with stress and strain distribution of first and last stage impeller blade, the effect of flow on dynamic characteristics of rotor system analyzed.