Abstract Reactor coolant flow measurement plays an important role in ensuring the normal and safe operation of nuclear power unit, but Helmholtz resonant cavity structure is easy to be formed in the flow measurement system, which affects the stability of flow measurement. In this paper, the influences of the length of the pressure-tapping pipe, the volume of the gas collector and the damping of the pressure-tapping pipe on Helmholtz resonance are studied by simulation analysis. The influence of these factors on reactor coolant flow measurement is researched by experiment. The results show that, by changing the length of the pressure-tapping pipe, the volume of the collector or the damping of the pressure-tapping pipe, the natural frequency of the system can be changed, the resonance phenomenon can be avoided, and the stability of the flow measurement can be improved. The results of this paper can be used as a theoretical basis to optimize the design of flow measurement system and solve the problem of flow fluctuation caused by resonance.

中文翻译：

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亥姆霍兹共振对反应堆冷却剂流量测量稳定性影响的研究

摘要 反应堆冷却剂流量测量对保证核电机组正常安全运行具有重要作用，但流量测量系统中易形成亥姆霍兹谐振腔结构，影响流量测量的稳定性。本文通过仿真分析研究了取压管长度、集气管容积和取压管阻尼对亥姆霍兹共振的影响。通过实验研究了这些因素对反应堆冷却剂流量测量的影响。结果表明，通过改变取压管的长度、集热器的容积或取压管的阻尼，可以改变系统的固有频率，避免共振现象，并且可以提高流量测量的稳定性。本文的研究结果可以作为优化流量测量系统设计和解决共振引起的流量波动问题的理论依据。