Numerical study on the dynamic characteristics of a reactor coolant pump ring seal
To study the influence of a seal ring on the rotor dynamic characteristics of a reactor coolant pump,con-sidering the seal ring of a Hua-long pressurized reactor 1000 coolant pump as the research object and applying the rotor dynamics theory,the whirl rotor dynamic equation under the small disturbance model was established.Based on the CFD quasi-steady state method,the internal flow field of the seal clearance region was numerically simulated to explore the effects of speed,pressure difference,and ring structure on the dynamic characteristics and stability of the rotor.The results reveal that the greater the speed and pressure difference are,the more important the effect of the whirl ratio on the sealing force is,and the absolute values of the stiffness and damping coefficients increase.Rotation speed has a considerable effect on the cross-stiffness and cross-damping coefficients.The cross-stiffness coefficients of the plane seal and the labyrinth seal increase by 6.92-fold and 4.13-fold,respectively,and the cross-damping coefficients increase by 15.4-fold and 6.25-fold,respectively.The pressure difference has a consid-erable effect on the direct-stiffness coefficient,which increases by 6.2-fold and 9.1-fold for the plane and labyrinth seals,respectively.Simultaneously,the labyrinth seal has a smaller vortex coefficient Ωf and better structural sta-bility than the plane seal.
ring sealstiffness coefficientdamping coefficientrotor stabilityreactor coolant pumpnumerical simulationdynamic characteristicsstructure of the ring
万方数据
维普
