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Journal of the Korean Society of Hazard Mitigation 2012;12(4):133-142.
Published online August 31, 2012.
Flow Coefficients of Doorway Flow Field in Two-room Building Fires
Flow Coefficients of Doorway Flow Field in Two-room Building Fires
Hyeon Don Ju, Hyun Hyi Kim
Abstract
In the case of a fire of two-room`s enclosure, the inflow and outflow mass rates through the doorway located between a burn room and an adjacent room have been researched. The objective of this study are to calculate the flow rates through the doorway of the burn room, to study the inflow and outflow coefficients of the doorway, and accurately to predict the neutral-plane height from the floor of the room in the stratified fire cases of the two-room`s enclosure. The inflow and outflow mass rates are analyzed by FDS developed by the National Institute of Standard and Technology, USA. The analyzed results by FDS are compared with the experimental results performed by Nakaya et al. By our study it is known that the flow coefficients vary according to fire size and opening configuration and the mean values of the inflow and outflow coefficients are 0.8 and 1.0 respectively.
Key Words: Neutral-plane height; Flow coefficient; Doorway; CFD
요지
방이 두 개인 경우의 화재에서 화재실과 인접한 실 사이에 위치한 문을 통하여 들어오고, 나가는 질량유량들에 대하여 연구가 되어 오고 있다. 본 연구의 목적은 화재실의 문을 통한 유량을 계산하고, 그 문에 대한 흡입 및 송출 유량계수들을 연구하고, 나아가서 2개의 방을 가진 밀폐공간 화재에서 실의 바닥으로부터 중성대의 높이를 정확히 예측하는데 있다. 미국의 국립표준기술국에 의해 개발된 FDS 소프트웨어에 의해 흡입 및 송출 유량을 해석하였다. FDS에 의해 해석된 결과들은 Nakaya 등에 의해 수행된 실험결과들과 비교하였다. 본 연구에 의해 흐름계수들은 화재의 크기와 문의 모양에 따라 변하고, 흡입 및 송출 유량계수의 평균값은 각각 0.8과 1.0임을 알 수 있다.
핵심용어: 중성대 높이; 흐름계수; ; 전산유체역학
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