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<p>Forest fires mainly come from the surface fuel layer, and the key to reducing the risk of forest fires is to block the spread of surface fires. Due to the complexity of the terrain environment, it is difficult to achieve efficient and rapid fire prevention by conventional physical means, which increases the difficulty and cost of forest fire prevention and control. Therefore, it is imperative to find a suitable, effective and clean extinguishing agent. In this paper, the inhibition test of fire extinguishing agent isolation zone in indoor environment was carried out on the spread of surface litter fire in the area with frequent forest fires in Southwest China. Three different fire extinguishing media, water, foam fire extinguishing agent and hydrogel fire extinguishing agent, are used. The results show that the different extinguishing media are able to suppress flame spread of mixed leaf litter combustion and the phenomenon of flying fire. However, as the slope increases, water and foam extinguishing agents cannot completely inhibit the spread of foliage litter flames, and during the period of inhibition by these two extinguishing media, when fuel flames are prone to spreading and burning across the containment zone, hydrogel is effective in inhibiting the spread of foliage litter flames. Comparing the peak temperature of TC1 before isolation zone and the peak temperature of TC5 after isolation zone, the reduction is about 70&#xa0;°C, 176&#xa0;°C and 208&#xa0;°C in the three extinguishing media conditions, respectively. And the cooling effect of hydrogel is the best compared with water and foam extinguishing agent. Based on the results of different widths of hydrogel barrier inhibiting the spread of leaf litter at different slopes, the relationship model between the intensity of surface fire spread at different slopes and the width of hydrogel barrier is constructed, and the boundary conditions of the hydrogel barrier inhibiting the spread of surface fire in leaf litter are determined, which is of great significance for the design of forest fire fighting systems.</p>

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Experimental study on the suppression of surface fire spread of leaf litter in forested areas of southwestern China by different extinguishing agent barrier strips in indoor environment

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Zhangyin Dai,
  • Congbao Huang,
  • Youcheng Chen,
  • Manyin Zhong

摘要

Forest fires mainly come from the surface fuel layer, and the key to reducing the risk of forest fires is to block the spread of surface fires. Due to the complexity of the terrain environment, it is difficult to achieve efficient and rapid fire prevention by conventional physical means, which increases the difficulty and cost of forest fire prevention and control. Therefore, it is imperative to find a suitable, effective and clean extinguishing agent. In this paper, the inhibition test of fire extinguishing agent isolation zone in indoor environment was carried out on the spread of surface litter fire in the area with frequent forest fires in Southwest China. Three different fire extinguishing media, water, foam fire extinguishing agent and hydrogel fire extinguishing agent, are used. The results show that the different extinguishing media are able to suppress flame spread of mixed leaf litter combustion and the phenomenon of flying fire. However, as the slope increases, water and foam extinguishing agents cannot completely inhibit the spread of foliage litter flames, and during the period of inhibition by these two extinguishing media, when fuel flames are prone to spreading and burning across the containment zone, hydrogel is effective in inhibiting the spread of foliage litter flames. Comparing the peak temperature of TC1 before isolation zone and the peak temperature of TC5 after isolation zone, the reduction is about 70 °C, 176 °C and 208 °C in the three extinguishing media conditions, respectively. And the cooling effect of hydrogel is the best compared with water and foam extinguishing agent. Based on the results of different widths of hydrogel barrier inhibiting the spread of leaf litter at different slopes, the relationship model between the intensity of surface fire spread at different slopes and the width of hydrogel barrier is constructed, and the boundary conditions of the hydrogel barrier inhibiting the spread of surface fire in leaf litter are determined, which is of great significance for the design of forest fire fighting systems.