A series of experimental tests were conducted to investigate the flame spread over poplar plywood in inclined trench. Considering the influence of the inner space between fuel and trench floor on combustion, poplar plywood was kept parallel to trench floor during the text. The effects of fuel position and inclination angle on trench fire behaviors were considered. The temperature inside trench was measured, and flame spread characteristics were recorded. The results demonstrate that a typical behavior of flame injection occurred during the flame spreading in trench, which mainly induced by the combined effects of thermal buoyancy and expansion force of pyrolysis gas, causing the flame to accelerate violently. What’s more, the larger the inclination angle is, the more violent the flame injection would be. And the fuel position has a significant influence on flame injection, both angles used in experiment exist a critical fuel position, at which the flame injection phenomenon is most obvious. Specially, the flame propagation velocity of poplar plywood varies obviously from bottom to top inside trench and the maximum value appeared in the middle of trench. Moreover, the flame spread process roughly could be divided into four stages according to the flame propagation acceleration, and flame injection starts in the second stage near the middle region of trench. Additionally, the temperature in trench increased sharply when the flame injection occurs, and temperature distribution indicates that the flame attachment toward poplar plywood is more likely to occur in larger inclination angle.
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Zhong W, Li ZZ, Wang T, Liang TS, Liu Z. Experimental study on the influence of different transverse fire locations on the critical longitudinal ventilation velocity in tunnel fires. Fire Technol. 2015;51:1217–30.
Tang F, Li LJ, Chen WK, Tao CF, Zhan Z. Studies on ceiling maximum thermal smoke temperature and longitudinal decay in a tunnel fire with different transverse gas burner locations. Appl Therm Eng. 2017;110:1674–81.
Yuan L, Smith AC. Numerical modeling of water spray suppression of conveyor belt fires in a large-scale tunnel. Process Saf Environ. 2015;95:93–101.
Edgar RA, Sharples JJ, Sidhu HS. Revisiting the King’s Cross underground disaster with implications for modelling wildfire erupt ion. In: 21st international congress on modelling and simulation, Gold Coast, Australia, 2015.
Simcox S, Wilkes NS, Jones IP. Computer simulation of the flows of hot gases from the fire at King’s Cross underground station. Fire Saf. 1992;18:49–73.
Fennell D. Investigation into the King’s Cross underground fire. London: HMSO; 1988.
Cox G, Chitty R, Kumar S. Fire modelling and the King’s Cross fire investigation. Fire Saf. 1989;15:103–6.
Drysdale D, Macmillan A, Shilitto D. The King’s Cross fire: experimental verification of the “Trench effect”. Fire Saf. 1992;18:75–82.
Drysdale D, Macmillan A. Flame spread on inclined surfaces. Fire Saf. 1992;18:245–54.
Viegas D. Extreme forest fire behaviour and its potential damage to the environment and to society. In: EGU general assembly conference abstracts; 2009. p. 13010.
Viegas DX. A mathematical model for forest fires blow-up. Combust Sci Technol. 2005;177:27–51.
Viegas DX. Parametric study of an eruptive fire behaviour model. Int J Wildland Fire. 2006;15:169–77.
Viegas DX, Pita LP. Fire spread in canyons. Int J Wildland Fire. 2004;13:253–74.
Dold JW, Zinoviev A. Fire eruption through intensity and spread rate interaction mediated by flow attachment. Combust Theor Model. 2009;13:763–93.
Fan CG, Li AY, Mu Y, Guo FY, Ji J. Smoke movement characteristics under stack effect in a mine laneway fire. Appl Therm Eng. 2017;110:70–9.
Tang F, Hu LH, Qiu ZW, Zhang XC, Lu KH. Window ejected flame height and heat flux along façade with air entrainment constraint by a sloping facing wall. Fire Saf J. 2015;71:248–56.
Chen CK, Chen J, Zhao XL, Shi CL. Experimental investigation on combustion characteristics of steel cable-stayed bridge. J Therm Anal Calorim. 2018;134:2317–27.
Wang Z, Wang J. An experimental study on the fire characteristics of new and aged building wires using a cone calorimeter. J Therm Anal Calorim. 2019;135:3115–22.
Yao YZ, Cheng XD, Zhang SG, Zhu K, Zhang HP, Shi L. Maximum smoke temperature beneath the ceiling in an enclosed channel with different fire locations. Appl Therm Eng. 2017;111:30–8.
Ji J, Fan CG, Li YZ, Ingason H, Sun JH. Experimental study of non-monotonous sidewall effect on flame characteristics and burning rate of n-heptane pool fires. Fuel. 2015;145:228–33.
Xie XD, Liu NA, Lei J, Shan YL, Zhang LH, Chen HX, Yuan XS, Li H. Upslope fire spread over a pine needle fuel bed in a trench associated with eruptive fire. Proc Combust Inst. 2017;36:3037–44.
Liu NA, Wu JM, Chen HX, Zhang LH, Deng ZH, Satoh K, Viegas DX, Raposo JR. Upslope spread of a linear flame front over a pine needle fuel bed: the role of convection cooling. Proc Combust Inst. 2015;35:2691–8.
Yang Z, Chen HX. Experimental study on flame geometry along the inclined surface with and without sidewalls by using a gas burner. Procedia Eng. 2018;211:925–33.
Du T, Yang D, Wei HB, Zhang ZJ. Experimental study on mixing and stratification of buoyancy-driven flows produced by continuous buoyant source in narrow inclined tank. Int J Heat Mass Transf. 2018;121:453–62.
Dupuy JL, Marechal J. The effects of slope and fuel width on laboratory fire behavior. Int J Wildland Fire. 2011;20:289–307.
Ma X, Tu R, An WG, Xu L, Luo SF, Wang JW, Tang F. Experimental study of interlayer effect induced by building facade curtain wall on downward flame spread behavior of polyurethane. Appl Therm Eng. 2020;167:114694.
Tang F, He Q, Wen J. Effect of crosswind and burner aspect ratio on flame characteristics and flame base drag length of diffusion flames. Combust Flame. 2019;200:265–75.
Funashima K, Masuyama A, Kuwana K, Kushida G. Opposed-flow flame spread in a narrow channel: prediction of flame spread velocity. Proc Combust Inst. 2019;37:3757–65.
Zhang Y, Ji J, Wang QS, Huang XJ, Wang QH, Sun JH. Prediction of the critical condition for flame acceleration over wood surface with different sample orientations. Combust Flame. 2012;159:2999–3002.
The study was financially supported by the National Key Research and Development Program of China under Grant No. 2018YFC0810200 and the National Natural Science Foundation of China (NSFC) under Grant Nos. 51576212 and 71790613. The authors greatly appreciate the support provided by these grants.
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Chen, C., Nie, Y., Zhang, Y. et al. Experimental study on flame spread over poplar plywood in inclined trench: phenomenon of flame injection. J Therm Anal Calorim (2020). https://doi.org/10.1007/s10973-020-09949-5
- Flame injection
- Poplar plywood
- Inclined trench
- Flame propagation velocity
- Temperature distribution