Effects of increasing the gap ratio on performance and pressure pulsations in a mixed-flow reactor coolant pump

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2024-10-17 DOI:10.1016/j.anucene.2024.110985

Lei Liu , Zuowen Zhong , Bin Lin , Junhao Gao , Chenyu Zhou , Lijun Liu

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Abstract

Reactor coolant pumps (RCPs) are important in nuclear reactor coolant systems, with the performance and stability significantly influenced by the small gap between the impeller and diffuser. This study investigates the effects of the gap ratio on the performance and pressure pulsation of CAP1400RCP. Results indicate an upper limit to the gap ratio, beyond which the head-flow rate curve degrades, producing an unacceptable hump. Within the permissible range, however, increasing the gap ratio reduces the non-uniformity of the leading edge (LE) of the diffuser caused by the impeller. Which reduces diffuser losses and enhances the efficiency of RCP. The study further reveals the strongest pressure pulsation at the shroud on the LE of diffuser. By increasing the gap ratio, the amplitudes of both f_BPF and its harmonic frequency significantly decrease, indicating a weaker pressure pulsation. These findings offer valuable quantitative guidance for impeller and diffuser gap design in mixed-flow RCPs.

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增大间隙比对混流式反应堆冷却剂泵的性能和压力脉动的影响

反应堆冷却剂泵（RCP）是核反应堆冷却剂系统中的重要设备，其性能和稳定性受到叶轮和扩散器之间微小间隙的显著影响。本研究探讨了间隙比对 CAP1400RCP 性能和压力脉动的影响。结果表明，间隙比有一个上限，超过这个上限，水头-流速曲线就会退化，产生一个不可接受的驼峰。不过，在允许范围内，增大间隙比可减少叶轮造成的扩散器前缘（LE）的不均匀性。这就减少了扩散器的损失，提高了 RCP 的效率。研究进一步发现，扩散器前缘护罩处的压力脉动最强。随着间隙比的增大，fBPF 及其谐波频率的振幅都明显减小，表明压力脉动减弱。这些发现为混流式 RCP 的叶轮和扩散器间隙设计提供了宝贵的定量指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.