- Author
- Suzuki, T. | Hirano, T. | Suzuki, T.
- Title
- Flame Spread Over Paper Soaked With a Combustible Liquid in an Opposed Air Stream.
- Coporate
- Tokyo Univ., Japan
- Journal
- Bulletin of Japanese Association of Fire Science and Engineering, Vol. 42, No. 2, 11-16, 1995
- Keywords
- paper | flame spread | combustible liquids | experiments | gasification | combustibles | wind tunnels
- Abstract
- [ONLY ABSTRACT IN ENGLISH] An experimental studyof vertically downward flame spread in an opposed air stream over the surface of a filter paper sheet soaked with a combustible liquid was performed to examine the effects of gasification properties of a combustibles on flame spread phenomena. The experiments were conducted in a vertical duct of 10 cm x 10 cm cross section and 22 cm long, which was mounted on the top of a converging nozzle of a wind tunnel. The filter paper sheets used for the experiments were of 23 cm x 10 cm surface area and 0.022 cm or 0.017 cm thick. Gasification properties of each paper sheet were controlled by changing the soaking liquid of normal paraffins, ranging in carbon numbers from 13 to 15. A few different aspects of spreading flames were observed. For free stream velocities from 0 to 1.3 m/s, the leading flame edge was almost straight and horizontal. The flame spread rate decreased rapidly with the increase of free stream velocity. For free stream velocities greater than 1.3 m/s, the flame was anchored at the top end of the paper sheet and apread in a low rate. The flame spread rate gradually decreased with the increase of free stream velocity. At a free stream velocity greater than 1.6 m/s, a flame was established once just after ignition but could not continue to spread. It was extinguished at a distance less than 110 mm from the top end. For free stream velocities from 0 to 0.9 m/s, the flame spread rate increased with the decrease of the boiling temperature of soaking liquid or paper sheet thickness, the free stream veloicty being kept constant, while for free stream velocities from 0.9 to 1.6 m/s, the flame spread rate was independent of the kind of soaking liquid or the paper sheet thickness.