- Author
- Hou, R. | Jian, G. F. | Wang, Q. A. | Hirano, T.
- Title
- Effects of Opening Position on Room Fire Characteristics.
- Coporate
- University of Science and Technology of China, Anhui Tokyo Univ., Bunkyo-ku
- Journal
- Bulletin of Japan Association for Fire Science and Engineering, Vol. 40, No. 2, 19-24, 1991
- Keywords
- room fires | scale models | ethanol | ventilation
- Abstract
- [ABSTRACT IN ENGLISH] An experimental study has been performed to examine the effects of opening position on room fire characteristics, using a small-scale model room. The model room is a 50 cm-cube chamber with an opening of variable position and area. A circular fuel vessel of 10 cm in diam. and 2 cm in depth is installed at the center of the floor, and fuel used is ethanol. It has been elucidated that the effects of the opening position on room fire characteristics are as significant as those of the ventilation parameter. Even if the opening configuraion is fixed, i.e., the ventilation parameter is constant, the temperature distribution and gas flow field in the chamber change in wide ranges. When the ventilation parameter [smybol] is small, extinction ocurs, and as [symbol] increases, combustion becomes oscillatory and then stable. The limiting values at the transitions betweenm these states depend largely on the distance h from the floor to the opening center. For larger values of [symbol] the dependence of mass burning rate of ethanol on h is significant. For a certain case, the rate of the maximum to minimum at a constant values of [symbol] exceeds 1.8.