Fire Sci. Eng. Search

CLOSE


Fire Sci. Eng. > Volume 33(6); 2019 > Article
Fire Science and Engineering 2019;33(6):1-8.
DOI: https://doi.org/10.7731/KIFSE.2019.33.6.001    Published online December 31, 2019.
분무 액적 특성이 화재진압에 미치는 영향에 대한 수치해석
이재호
한국수력원자력(주) 중앙연구원 선임연구원
Numerical Analysis of the Effects of Droplets Characteristics of Water Spray on Fire Suppression
Jaiho Lee
Senior Researcher, Korea Hydro & Nuclear Power Co., Ltd, Central Research Institute
Correspondence:  Jaiho Lee, Tel: +82-42-870-5459, Fax: +82-42-870-5449, 
Email: jaiholee@khnp.co.kr
Received: 16 October 2019   • Revised: 28 October 2019   • Accepted: 28 October 2019
요약
본 연구에서는 물 분무 액적 특성 변화가 화재 진압에 미치는 영향을 FDS 6.5.2를 이용하여 수치적으로 분석하였다. 물 분무 노즐의 소화계수, 액적 분포함수, 중간체적 직경 및 초당 액적 수 변화에 대한 화재진압 특성은 정규 열방출률 곡선의 감소율와 냉각시간의 측면에서 평가되었다. 소화계수가 증가하면 정규열방출률 곡선이 더 급격하게 감소하고, 중간체적입경 변화가 화재진압에 영향을 미치는 것을 확인하였다. 단일 액적분포에서 초당액적수의 증가에 따라 정규 열방출률 곡선은 더 완만하게 감소하였으며, 다중분포에서는 초당액적수가 작은 조건에서만 정규 열방출률 곡선이 급격하게 감소하는 것을 확인하였다.
Abstract
In this study, the effects of the characteristics of droplets of water spray on suppression of fire were analyzed numerically using fire dynamics simulator (FDS) 6.5.2. Additionally, the fire suppression characteristics by the water spray nozzle, including the extinguishing coefficient (EC), droplet size distribution function (SDF), median volumetric diameter (MVD), and droplets per second (DPS), were evaluated in terms of the decreasing normalized heat release rate (HRR) curve and cooling time. It was observed that with increase in the EC, the normalized HRR curve decreased rapidly, and the changing MVD affected the suppression of fire. In case of mono-disperse, the normalized HRR curve decreased slowly with the increase in DPS. On the contrary, in case of multi-disperse, the normalized HRR curve decreased rapidly even with a small increase in DPS.
Key Words: Fire suppression, Size distribution function, Water spray, Water mist, Median volumetric diameter


ABOUT
BROWSE ARTICLES
EDITORIAL POLICY
AUTHOR INFORMATION
Editorial Office
22, Teheran-ro 7-gil, Gangnam-gu, Seoul 06130, Republic of Korea
Tel: +82-2-555-2450    Fax: +82-2-3453-5855    E-mail: kifse@hanmail.net                

Copyright © 2020 by Korean Institute of Fire Science and Engineering. All rights reserved.

Developed in M2community

Close layer
prev next