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| Dynamic analysis of the axial vibration of the impeller in a reactor coolant pump induced by the radial leakage flow |
| Received:March 28, 2017 Revised:May 08, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20170328001 |
| KeyWord:leakage flow axial vibration dynamic characteristics numerical simulation |
| Author | Institution |
| 李姿琳 |
大连理工大学 工程力学系工业装备结构分析国家重点实验室, 大连 |
| 徐胜利 |
大连理工大学 能源与动力学院, 大连 |
| 关振群 |
大连理工大学 工程力学系工业装备结构分析国家重点实验室, 大连 |
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| Abstract: |
| This paper studies the axial dynamic characteristics of leakage-flow-induced vibration of a theoretical model and a real clearance between the shroud and impeller of a reactor coolant pump.Since structures like bearings and rotating machineries all have leakage flow problems,dynamics of the clearance will affect the stability of the system.In the case when the wall of clearance is rotating with respect to the axis while vibrating in the axial direction,the fluid force acting on the wall changes,therefore the dynamic characteristics of the clearance can be approximately described by the dynamic characteristics:stiffness and damping.Three types of clearance,including the flat clearance,the enlarged clearance and the contracting clearance,are analyzed in this paper and negative stiffness or damping characteristics can be seen in both of the flat clearance and enlarged clearance cases.In contrast,the contracting shape clearance is better as its stiffness and damping are always positive.Research on axial dynamic characteristics of the clearance between the shroud and impeller of a reactor coolant pump is carried out and results show negative stiffness and damping of this clearance in some cases.This clearance is an unstable factor to the system. |
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