Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Numerical analysis on the rapid fire suppression using a water mist nozzle in a fire compartment with a door opening

  • Lee, Jaiho (Korea Hydro & Nuclear Power Co., Ltd, Central Research Institute)
  • Received : 2018.08.09
  • Accepted : 2018.10.31
  • Published : 2019.04.25
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Abstract

Fire suppression using a water mist nozzle directly above an n-Heptane pool in a fire compartment with a door opening was numerically investigated using the Fire Dynamics Simulator (FDS) for the purpose of application in nuclear power plants. Input parameters for the numerical simulation were determined by experimental measurements. Water mist was activated 10 s after the fire began. The sensitivity analysis was conducted for three input parameters: total number of cubic cells of 6032-2,926,400, droplets per second of 1000-500,000, and extinguishing coefficient of 0-100. In a new simple calibration method of this study, the extinguishing coefficient yielding the fire suppression time closest to that measured by experiments was found for use as the FDS simulation input value. When the water mist jet flow made contact with the developed fire, the heat release rate instantaneously increased, and then rapidly decreased. This phenomenon occurred with a displacement of the flame near the liquid fuel pool. Changing the configuration of the door opening with different aspect ratios and opening ratios had impact on the maximum value of the heat release rate due to the flame displacement.

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