Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Numerical Analysis on Development of Nozzle Shape for NOVEC Gas Extinguishing System

NOVEC가스 소화설비용 노즐 형상 설계에 대한 수치해석

  • Yun, Jeong In (Korea Marine Equipment Research Institute) ;
  • Jung, Kyung Kuk (Korea Marine Equipment Research Institute) ;
  • Kim, Ji Sung (Korea Marine Equipment Research Institute) ;
  • Kim, Sung Yoon (Korea Marine Equipment Research Institute) ;
  • Rho, Beom-Seok (Education & Management Team, Korea Institute of Maritime and Fisheries Technology) ;
  • Choi, Jae-Hyuk (Division of Marine System Engineering, Korea Maritime and Ocean University)
  • 윤정인 ((재)한국조선해양기자재연구원) ;
  • 정경국 ((재)한국조선해양기자재연구원) ;
  • 김지성 ((재)한국조선해양기자재연구원) ;
  • 김성윤 ((재)한국조선해양기자재연구원) ;
  • 노범석 (한국해양수산연수원) ;
  • 최재혁 (한국해양대학교 기관시스템공학부)
  • Received : 2018.10.10
  • Accepted : 2018.12.28
  • Published : 2018.12.31
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Abstract

Clean fire extinguishing agents refer to chemical that can replace Halon 1211 and Halon 1310 according to the Montreal Protocol fermented to protect the Earth's ozone layer. In Korea and abroad, system standardization and performance evaluation of clean fire extinguishing agents are being carried out. This paper proposes an optimal nozzle shape by modeling and numerical analysis of various nozzle shapes based on general clean fire extinguishing system. The ejection speed of the nozzle can be improved by studying three - dimensional modeling of the nozzle for two shapes, Type A and B. Flow analysis was performed on the two types of nozzles and the gas velocity and pressure distribution were measured with different nozzle diameters. It was confirmed that the jetting speed was changed at the nozzle outlet according to the number and diameter of the nozzle holes. The flow rate increased with increasing the pressure regardless of the nozzle hole diameter. Based on the results obtained from the experiment, the K-factor value was deduced. Finally, a nozzle with a 12-hole structure with a 5-mm nozzle hole was proposed.

청정소화약제는 지구오존층 보호를 위해 발효된 몬트리올 의정서에 따라 할론 1211 및 할론 1310을 대체할 수 있는 약제를 말한다. 국 내외적으로는 청정소화약의 시스템 표준화와 성능평가가 수행되고 있다. 본 논문은 일반적인 청정소화약제 시스템을 바탕으로 다양한 노즐의 형상에 대한 모델링 및 수치해석을 수행하여 최적의 노즐 형상을 제안하였다. Type A와 B의 2가지 형상에 대한 노즐의 3차원 모델링을 통해 노즐의 분출속도가 개선될 수 있도록 하였다. 2가지 형상의 노즐에 대하여 유동해석을 실시하였으며 노즐의 홀 직경을 다르게 하여 가스속도 및 압력분포를 측정하였다. 측정결과 노즐 홀 수 및 직경에 따라 노즐출구에서 분출속도가 달라지는 것을 확인 할 수 있었으며 노즐 홀 직경에 관계없이 유량은 압력이 증가함에 따라 증가하는 경향을 나타내었다. 실험을 통해 얻어진 결과를 바탕으로 노즐 직경이 5 mm인 경우의 K-factor값이 $101.8l/min{\cdot}bar^{-0.5}$임을 확인하였으며, 최종적으로 노즐 홀 5 mm인 12개의 홀이 2층 구조로 되어 있는 형상의 노즐을 제안하였다.

Keywords

References

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