Numerical Analysis Of Fluid Structure Interaction And Comments To Rotor Stator Interaction In Ap1000Reactor Coolant Pump

In the process of researching AP1000reactor coolant pump (RCP) independently in China, to understand the key scientific issues about the ideas of RCP’s design and manufacture has great significance for the healthy development of China’s nuclear power industry.Good structure characteristic is an important factor that the designers should consider about in the process of the RCP design, besides good hydraulic performance. The RCP with sufficient strength, excellent hydraulic and structural performance and low noise is the assurance of operating for a long stable and reliable time in the high temperature, high pressure and intensive radiation environment. Pressure fluctuation caused by rotor stator interaction is the main reason for vibration and noise. This paper showed the numerical study of the unsteady flow in the RCP, the relationship between hydraulic loads and the structure and to evaluate the vibration response. The results provide some theoretical support for independent design of the RCP.Based on the AP1000RCP3D model, this paper investigated the flow in the RCP by using CFD technology. The influence of boric acid concentration upon hydraulic pump performance was analyzed with true coolant parameters in high temperature and pressure. Then the unsteady flow was simulated and pressure fluctuation caused by rotor stator interaction and the excited frequency was obtained. The pressure distribution on the blades from CFD calculation can use to do further structure analysis.Static and dynamic analyses of the RCP structure were studied by using FSI and FEM method. The deformation and stress were also predicted. The modal response in air and water were carried out for comparing the natural frequency difference between them. The results showed that the fluid added mass had a significant effect on the natural frequency. The natural frequency decreased obviously.The rotor stator combination theory based on rotor stator interaction was introduced. Some imported RCPs were verified by using this theory. Then suitable numbers of blade and vane combination were listed. The vibration characteristics of two different RCP blade and vane combinations were compared. The results showed that the combination with7blades and18vanes had better vibration performance than5blades and9vanes. The conclusion aims to provide guide for further design.