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Passive mitigation of condensation-induced water hammer by converging-diverging structures for offshore nuclear power plants

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  • Wang, Zhiwei
  • He, Yanping
  • Duan, Zhongdi
  • Huang, Chao
  • Liu, Shiwen
  • Xue, Hongxiang

Abstract

The equal-height-difference passive heat removal system (EHDPHRS) utilizes the ocean environment as an infinite heat sink that can better suit ocean nuclear power plants (ONPPs). However, a structure with an equal-height-difference can easily cause reverse flow of subcooled water, leading to serious condensation-induced water hammer (CIWH). In this paper, a fully visual experimental facility with same geometric characteristics as the EHDPHRS was established with the aim of studying the CIWH phenomenon. First, two kinds of CIWH modes were observed by the results of the visual experiment, namely the intermittent CIWH and the continuous CIWH. The typical feature of the intermittent CIWH is that the single-phase natural circulation occurs intermittently. Then, the converging-diverging structure (CDS) was designed to avoid the CIWH events in the EHDPHRS. The effectiveness of CIWH prevention was evaluated employing the velocity field, which was obtained by the PIV experimental system. It was found that the CDS can effectively inhibit the further reverse flow of subcooled water and thus eliminate the triggering mechanism of CIWH events. Finally, a dimensionless number was used to balance CIWH prevention and natural circulation capacity. It was shown that when the dimensionless number is in the range of 0.67–0.80, the CDS can eliminate the CIWH events while ensuring the natural circulation capacity.

Suggested Citation

  • Wang, Zhiwei & He, Yanping & Duan, Zhongdi & Huang, Chao & Liu, Shiwen & Xue, Hongxiang, 2023. "Passive mitigation of condensation-induced water hammer by converging-diverging structures for offshore nuclear power plants," Energy, Elsevier, vol. 282(C).
    • Handle: RePEc:eee:energy:v:282:y:2023:i:c:s0360544223017772
    DOI: 10.1016/j.energy.2023.128383
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    References listed on IDEAS

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    Cited by:

    1. Shu, Zhiyong & Lei, Gang & Liang, Wenqing & Huang, Lei & Che, Bangxiang & Zheng, Xiaohong & Qian, Hua, 2024. "Rapid prediction of water hammer characteristics in liquid hydrogen storage and transportation systems: A theoretical model," Renewable Energy, Elsevier, vol. 230(C).

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