Abstract
This paper studies the influence of added mass, centrifugal force and hydraulic load on natural frequencies of a Reactor Coolant Pump (RCP) impeller. A series of comparative studies under different conditions were carried out on a modal test bench and a simulation platform. Modal analysis of a full-scale RCP impeller was conducted by simulation, and an improved design of impeller was proposed to prevent hydraulic resonance. These results indicated that hydraulic load increases natural frequencies of the impeller. While the centrifugal force slightly reduces them, but it is negligible. Because the distribution of hydraulic load has an effect to natural frequencies, a solution of cutting inlet edges of blades can be used to increase the natural frequency that may cause hydraulic resonance. In summary, our research shows that both added mass and hydraulic load have a significant influence on natural frequencies of the RCP impeller, and redistributing the hydraulic load can alter natural frequencies of the impeller.
Highlights
The reactor coolant pump (RCP) drives cooling water circulation in the nuclear power plant [1], which brings the heat of the nuclear reactor to the steam generator, thereby producing steam to generate electricity
According to the comparison among modal data in different environments, it is found that both added mass and hydraulic load have a great influence on natural frequencies of the RCP impeller, but the impact of centrifugal force on them can be ignored
Since natural frequencies of the the Thiswithout study analyzes the hydraulic influence three factors on naturalSince frequencies of the RCP impeller and underwater impeller are subject to hydraulic load, relieving the stress concentration may increase underwater impellerofare subject tonatural hydraulic load, frequencies
Summary
The reactor coolant pump (RCP) drives cooling water circulation in the nuclear power plant [1], which brings the heat of the nuclear reactor to the steam generator, thereby producing steam to generate electricity. S et al [11] analyzed the damping ratio of the underwater static impeller and calculated the dynamic magnification coefficient They only took the influence of added mass into account, while the rotating RCP impeller under operation condition can be subject to centrifugal force and hydraulic load. Their studies towards the modal analysis of the RCP impeller are insufficient. According to the comparison among modal data in different environments, it is found that both added mass and hydraulic load have a great influence on natural frequencies of the RCP impeller, but the impact of centrifugal force on them can be ignored. Hydraulic resonance analysis of an RCP impeller was carried out, and a solution of cutting inlet edges of blades was implemented to avoid resonance of the impeller
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