Numerical Simulation of Vertical Wall fires II. Propane Fire

Woe-Chul, Park; Arnaud, Trouve

Journal of Korean Institute of Fire Science and Engineering 2008;22(3):188-193.
Published online September 30, 2008.

수직벽화재의 수치 시뮬레이션 II. 프로판 화재

박외철, 아노드 트루베

¹부경대학교 공과대학 안전공학부
²Dept. of Fire Protection Engineering, University of Maryland

Numerical Simulation of Vertical Wall fires II. Propane Fire

Park Woe-Chul, Trouve Arnaud

¹Pukyong National University, College of Engineering, Department of Safety Engineering
²Dept. of Fire Protection Engineering, University of Maryland

요약

높이 1m의 수직벽면에서 3g/m^2-s$로 연소하는 프로판 수직벽 화재에 대한 수치모사를 수행하였다. 본 연구의 목적은 자연대류에서의 검증결과를 확인하고, 수직벽 화재의 수치모사의 결과를 이전의 연구와 비교하는 것이다 C_s=0.2$일 때 유동이 층류 경계층으로 나타났지만, C_s=0.1$일 때는 난류 경계층임을 확인하였다. z 방향 속도로부터 자연대류에서와 마찬가지로 난류혼합이 부족한 것으로 나타났고, 온도와 속도의 분포가 실험 및 이전의 시뮬레이션과 비교적 잘 일치하였다. 특히 x 방향 속도가 실험과 매우 잘 일치함으로써 경계층으로 공기유입이 잘 예측됨을 알 수 있었다.

Abstract

Numerical simulation was carried out for a propane fire of mass transfer rate 3g/m^2-s$ on a 1m high vertical wall. The objectives of this study are to confirm the outcomes of evaluation of the simulator through simulation of natural convection, and to compare the results of the wall fire with those of previous studies. It was confirmed that the simulated boundary layer was laminar at C_s=0.2$ while it was turbulent at C_s=0.1$. The z direction velocity showed lack of turbulent mixing as seen in the natural convection case, and the profiles of temperature and velocities were in relatively good agreement with those of experiment and previous simulation. It was found that the air entrainment into the boundary layer was well predicted.

Key Words: Propane gas, Vertical wall fire, Turbulent boundary layer, Velocity profile, Temperature profile, Numerical simulation