Abstract
Effects of confined spaces on flame spread over thin solid fuels in a low-speed opposing flow is investigated by combined use of microgravity experiments and computations. The flame behaviors are observed to depend strongly on the height of the flow tunnel. In particular, a non-monotonic trend of flame spread rate versus tunnel height is found, with the fastest flame occurring in the 3 cm high tunnel. The flame length and the total heat release rate from the flame also change with tunnel height, and a faster flame has a larger length and a higher heat release rate. The computation analyses indicate that a confined space modifies the flow around the spreading flame. The confinement restricts the thermal expansion and accelerates the flow in the streamwise direction. Above the flame, the flow deflects back from the tunnel wall. This inward flow pushes the flame towards the fuel surface, and increases oxygen transport into the flame. Such a flow modification explains the variations of flame spread rate and flame length with tunnel height. The present results suggest that the confinement effects on flame behavior in microgravity should be accounted to assess accurately the spacecraft fire hazard.
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References
Andracchio, C.R., Cochran, T.H.: Gravity effects on flame spreading over solid surfaces. NASA TN D-8228 (1976)
Bhattacharjee, S., Altenkirch, R.A.: Radiation-controlled, opposed-flow flame spread in a microgravity environment. Proc. Combust. Inst. 23, 1627–1633 (1990)
Frey, A.E., T’ien, J.S.: A theory of flame spread over a solid fuel including finite-rate chemical kinetics. Combust. Flame 36, 263–289 (1979)
Friedman, R.: Risks and issues in fire safety on the space station. NASA TM-106430 (1994)
Friedman, R.: Testing and selection of fire-resistant materials for spacecraft use. NASA TM-209773 (2000)
Grayson, G., Sacksteder, K.R., Ferkul, P.V., T’ien, J.S.: Flame spreading over a thin solid in low-speed concurrent flow—drop tower experimental results and comparison with theory. Microgravity Sci. Technol. 7, 187–195 (1994)
Kashiwagi, T., Nambu, H.: Global kinetic constants for thermal oxidative degradation of a cellulosic paper. Combust. Flame 88, 345–368 (1992)
Kashiwagi, T., McGrattan, K.B., Olson, S.L., Fujita, O., Kikuchi, M., Ito, K.: Effects of slow wind on localized radiative ignition and transition to flame spread in microgravity. Proc. Combust. Inst. 26, 1345–1352 (1996)
McGrattan, K.B., Kashiwagi, T., Baum, H.R., Olson, S.L.: Effects of ignition and wind on the transition to flame spread in a microgravity environment. Combust. Flame 106, 377–391 (1996)
Nakabe, K., McGrattan, K.B., Kashiwagi, T., Baum, H.R., Yamashita, H., Kushida, G.: Ignition and transition to flame spread over a thermally thin cellulosic sheet in a microgravity environment, Combust. Flame 98, 361–374 (1994)
Nakamura, Y., Kashiwagi, T., McGrattan, K.B., Baum, H.R.: Enclosure effects on flame spread over solid fuels in microgravity. Combust. Flame 130, 307–321 (2002)
Olson, S.L., Ferkul, P.V., T’ien, J.S.: Near-limit flame spread over a thin solid fuel in microgravity. Proc. Combust. Inst. 22, 1213–1222 (1988)
Olson, S.L.: Mechanisms of microgravity flame spread over a thin solid fuel: oxygen and opposed flow effects. Combust. Sci. Tech. 76, 233–249 (1991)
Olson, S.L., Kashiwagi, T., Fujita, O., Kikuchi, M., Ito, K.: Experimental observations of spot radiative ignition and subsequent three-dimensional flame spread over thin cellulose fuels. Combust. Flame 125, 852–864 (2001)
Olson, S.L., Miller, F.J., Jahangirian, S., Wichman, I.S.: Flame spread over thin fuels in actual and simulated microgravity conditions. Combust. Flame 156, 1214–1226 (2009)
Quintiere, J.G.: Fundamentals of Fire Phenomena. Wiley, West Sussex, England (2001)
Ramachandra, P.A., Altenkirch, R.A., Bhattacharjee, S., Tang, L., Sacksteder, K., Wolverton, M.K.: The behavior of flames spreading over thin solids in microgravity. Combust. Flame 100, 71–84 (1995)
Sacksteder, K.R., Greenberg, P.S., Pettegrew, R.D., T’ien, J.S., Ferkul, P.V., Shih, H.-Y.: Forced flow flame spreading test: preliminary findings from the USMP-3 Shuttle mission. Third United States Microgravity Payload: One Year Report. NASA/CP-1998- 207891 (1998)
Shih, H.-Y., T’ien, J.S.: Modeling wall influence on solid-fuel flame spread in a flow tunnel. AIAA paper 97-0236 (1997)
Shih, H.-Y., T’ien, J.S.: Modeling concurrent flame spread over a thin solid in a low-speed flow tunnel. Proc. Combust. Inst. 28, 2777–2784 (2000)
T’ien, J.S., Shih, H.-Y., Jiang, C.-B., Ross, H.D., Miller, F.J., Fernandez-Pello, A.C., Torero, J.L., Walther, D.: Mechanisms of flame spread and smolder wave propagation. In: Ross, H.D. (ed.) Microgravity Combustion: Fire in Free Fall. Academic Press, San Diego (2001)
Zhang, X., Yu, Y.: Experimental studies on the three-dimensional effects of opposed-flow flame spread over thin solid materials. Combust. Flame 158, 1193–1200 (2011)
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This work is funded by the Strategic Pioneer Program on Space Science, Chinese Academy of Sciences, under grant No. XDA04020410.
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Wang, S., Hu, J., Xiao, Y. et al. Opposed-flow Flame Spread Over Solid Fuels in Microgravity: the Effect of Confined Spaces. Microgravity Sci. Technol. 27, 329–336 (2015). https://doi.org/10.1007/s12217-015-9419-z
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DOI: https://doi.org/10.1007/s12217-015-9419-z