Nuclear Engineering and Technology

  • 제56권10호
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  • Pages.4077-4086
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  • 2024
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Thermal-hydraulic phenomena and heat removal performance of a passive containment cooling system according to exit loss coefficient

  • Sun Taek Lim (Department of Mechanical Engineering, Incheon National University) ;
  • Koung Moon Kim (Korea Institute of Fusion Energy) ;
  • Jun-young Kang (Thermal hydraulic and severe accident safety research division, Korea Atomic Energy Research Institute) ;
  • Taewan Kim (Department of Safety Engineering, Incheon National University) ;
  • Dong-Wook Jerng (School of Energy System Engineering, Chung-Ang University) ;
  • Ho Seon Ahn (Department of Mechanical Engineering, Incheon National University)
  • 투고 : 2024.02.20
  • 심사 : 2024.05.13
  • 발행 : 2024.10.25
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초록

The natural circulation system has been widely studied for use in various applications because of its inherent advantage. However, it has a key weakness called flow instability that makes the system unstable. Through massive previous research, the mechanisms of flow instability were analyzed, but there was an ambiguous aspect related to the effect of experimental parameters on the phenomenon. Particularly, there has been no report on the heat transfer performance of the system when flow instability phenomena were present. In this study, thermal-hydraulic phenomena of a two-phase natural circulation system that functions as a passive containment cooling system (PCCS) was investigated according to experimental parameters, namely, the temperature boundary (120-158 ℃) and exit loss coefficient (0-34.5) under atmospheric pressure conditions. The experimental results showed five different flow types in the loop. The flow modes that occurred by the interaction between flashing and boiling were classified by referring to the mass flow rate, void fraction, and visualization data. The system was more unstable when the temperature boundary conditions increased, but it was more stable when the exit loss coefficient increased. These results have only been confirmed in our research. The reason for the results is that the flow conditions are located on the boundary between Density Wave Oscillation I and the stable flow region, and that boundary does not have clear criteria. In addition, comparing the heat transfer performance of a system by heat rate can confirm the effect of flow instability on the thermal performance of the passive cooling system. As a result, the high exit loss coefficient stabilizes the system better than the low case and has similar heat removal performance.

키워드

과제정보

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science and ICT) (NRF-2017M2B2B1072553).

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