Abstract
A low-pressure narrow channel method (LPNCM) was proposed in this paper to study the fire initiation of wire insulation in microgravity. The detailed principles for parameter choices of LPNCM were discussed. Based on this method, a weakly buoyant environmental setup was established and the effects of overloaded current on the fire initiation of wire insulation were investigated systematically. Results show that if the ambient pressure was reduced to a proper range, the method could effectively investigate the flammability of wire insulation in the weakly buoyancy environment by increasing the narrow channel height. It can overcome the shortages in the conventional narrow channel method by decreasing the pressure to a proper extent. The observed fire initiation characteristics of wire insulation using LPNCM are similar with those conducted in microgravity. Thus, the presented method provides a new tool to conduct experiments of thermally thick fuels at normal gravity to simulate the fire initiation in microgravity.
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Bergman, T.L., Lavine, A.S., Incropera, F.P.: Fundamentals of Heat and Mass Transfer. 7th ed. John 431 Wiley & Sons, Inc., Jefferson City, USA (2011)
Chen, L.F., Xin, Z., Kong, W.J.: Functional simulations of the fire precursor of the wire insulation in quiescent microgravity environment. Chin. J. Space Sci. 26(3), 235–240 (2006)
Friedman, R.: Risks and issues in fire safety on the space station NASA TM-106430 (1994)
Friedman, R.: Fire safety in extraterrestrial environments NASA TM–207417 (1998)
Friedman, R., Gokoglu, S.A., Urban, D.L.: Microgravity combustion research: 1999 program and results NASA TM-209198 (1999)
Friedman, R., Jackson, B., Olson, S.: Testing and selection of Fire-Resistant materials for spacecraft use NASA/TM—2000-209773 (2000)
Fujita, O., Kikuchi, M., Ito, K., Nish, K.: Effective mechanisms to determine flame spread rate over ethylene-tetrafluoroethylene wire insulation: Discussion on dilution gas effect based on temperature measurements. Proc. Combust. Inst. 28(2), 2905–2911 (2000)
Fujita, O., Nish, K., Ito, K.: Effect of low external flow on flame spread over polyethylene-insulated wire in microgravity. Proc. Combust. Inst. 29(2), 2545–2550 (2002)
Fujita, O., Kyono, T., Kido, Y.: Ignition of wire insulation with short-term excess electric current in microgravity. Proc. Combust. Inst. 33(2), 2617–2623 (2011)
Fujita, O.: Solid combustion research in microgravity as a basis of fire safety in space. Proc. Combust. Inst. 35(3), 2487–2502 (2015)
Greenberg, P.S., Sacksteder, K.R., Kashiwagi, T.: Wire insulation flammability experiment: USML-1 1 year post mission summary. NASA CP 3272, 631–655 (1994)
Greenberg, P.S., Sacksteder, K.R., Kashiwagi, T.: Wire insulation flammability. NASA CP 10174, 25–30 (1995)
Hu, L.H., Zhang, Y.S., Yoshioka, K, et al.: Flame spread over electric wire with high thermal conductivity metal core at different inclinations. Proc. Combust. Inst. 35(3), 2607–2614 (2015)
Ivanov, A.V., Balashov, Y.V.: Experimental verification of material flammability in space NASA/CR—1999-209405 (1999)
Kikuchi, M., Fujita, O., Ito, K., Sato, A: Experimental study on flame spread over wire insulation in microgravity. Proc. Combust. Inst. 27, 2507–2514 (1998)
Kikuchi, M., Fujita, O., Ito, K., Sato, A.: Flame spread over polymeric wire insulation in microgravity. Space Forum 6(1-4), 245–251 (2000)
Kong, W.J., Lao, S.Q., Zhang, P.Y.: Study on wire insulation flammability at microgravity by functional simulation method. J. Combust. Sci. Technol. 12(1), 1–4 (2006)
Kong, W.J., Wang, B.R., Law, S.Q.: Study on fire precursor of wire insulation in Low-Pressure environments. J. Eng. Thermophys. 28(6), 1047–1049 (2007)
Kong, W.J., Wang, B.R., Zhang, W.K.: Study on prefire phenomena of wire insulation in microgravity. Microgravity Sci. Technol. 20, 107–113 (2008)
Law, C.K.: Combustion Physics, 1st edn. Cambridge University Press, New York, USA (2006)
Limero, T., Wilson, S., Perlot, S., James, J.: The role of environmental health system air quality monitors in space station contingency operations. SAE Trans. 101, 1521–1526 (1992)
Olson, S.L., Miller, F.J., Jahangirian, S., Wichman, I.S.: Flame spread over thin fuels in actual and simulated microgravity conditions. Combust. Flame 2009, 1214–1226 (2009)
Osorio, A.F., Mizutani, K., Fernandez-Pello, C., Fujita, O.: Microgravity flammability limits of ETFE insulated wires exposed to external radiation. Proc. Combust. Inst. 35, 2683–2689 (2015)
Takahashi, S., Ito, H., Nakamura, Y., Fujita, O.: Extinction limits of spreading flames over wires in microgravity. Combust. Flame 160, 1900–1902 (2013a)
Takahashi, S., Takeuchi, H., Ito, H., Nakamura, Y., Fujita, O.: Study on unsteady molten insulation volume change during flame spreading over wire insulation in microgravity. Proc. Combust. Inst. 34(2), 2657–2664 (2013b)
Takano, F.O., Shigeta, N.: Ignition limits of short-term overloaded electric wires in microgravity. Proc. Combust. Inst. 34(2), 2665–2673 (2013)
Wang, K., Ai, Y.H., Wang, B.R., Kong, W.J.: Study on pre-fire characteristics of wire insulation by overload in weakly buoyant environment. J. Eng. Thermophys. 33(4), 689–693 (2012a)
Wang, K., Wang, B.R., Ai, Y.H., Kong, W.J.: Study on the pre-ignition characteristics of wire insulation in the narrow channel setup. Sci. China Technol. Sci. 55, 2132–2139 (2012b)
Wang, K., Wang, B.R., Kong, W.J., Liu, F.S.: Study on the pre-ignition temperature variations of wire insulation under overload conditions in microgravity by the functional simulation method. J. Fire Sci. 32(3), 257–280 (2014)
Wichman, I.S., Olson, S.L.: Flamelet formation in Hele-Shaw flow. NASA/CP-2003-212376/REV1, 29–31 (2003)
Xiao, Y., Hu, J., Wang, S.F.: A narrow channel experimental study on flammability characteristics of thermally thin fuels under simulated microgravity conditions. J. Astron. 31(7), 1877–1882 (2010a)
Xiao, Y., Ren, T., Wang, S.F.: Flame spread over thermally thick fuels in narrow channel apparatus. J. Eng. Thermophys. 31(8), 1423–1426 (2010b)
Zhang, X.: Simulation of flame spread over thin solid fuel under microgravity using narrow channel on ground. Chin. J. Theor. Appl. Mech. 39(4), 466–472 (2007)
Zhang, X.: Opposed-flow flame spread over a thin solid material in narrow channels in normal and microgravity. J. Eng. Thermophys. 29(2), 347–350 (2008)
Zhang, X., Yu, Y.: Comparability of flame spread over thin solid fuel surface under different gravities. J. Combust. Sci. Technol. 14(4), 289–294 (2008)
Zik, O., Olami, Z., Moses, E.: Fingering instability in combustion. Phys. Rev. Lett. 81(18), 3868–3871 (1998a)
Zik, O., Olami, Z., Moses, E.: Fingering instability in solid fuel combustion: the characteristic scales of the developed state. The Combustion Institute, 2815–2830 (1998b)
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This research was funded by the Strategic Priority Research Program on Space Science, the Chinese Academy of Sciences under Grant No.XDA04020208 and No.XDA04020202-08.
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Wang, K., Xia, W., Wang, B. et al. Study on Fire Initiation of Wire Insulation by a Narrow Channel at low Pressure. Microgravity Sci. Technol. 28, 155–163 (2016). https://doi.org/10.1007/s12217-016-9494-9
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DOI: https://doi.org/10.1007/s12217-016-9494-9