为了提高森林火灾灭火效率，减少对森林资源和生态环境的损害，制备了一种由A类泡沫灭火剂与纳米SiO₂颗粒组成的三相A类泡沫灭火剂。采用双注射器法和木垛灭火试验平台，研究了纳米SiO₂质量分数对泡沫稳定性和灭火效能的影响。研究结果表明：纳米SiO₂显著增强泡沫稳定性，延缓泡沫析液与泡沫粗化；与传统A类泡沫灭火剂相比，三相A类泡沫灭火剂在相同驱动压力下更快速、高效地熄灭火焰，无复燃且用量更少；1.5% SiO₂的三相A类泡沫灭火剂表现出最佳灭火效能。三相A类泡沫灭火剂显著提升灭火效率，减少灭火剂消耗，且成本低，适用于大规模森林火灾。研究为森林火灾的高效灭火提供了新方案，具有广泛的实际应用前景。

In order to improve the fire extinguishing efficiency of forest fires and reduce the damage to forest resources and ecological environment, a three-phase class A foam extinguishing agent consisting of class A foam extinguishing agent with nano-SiO₂ particles was prepared. The effects of nano-SiO₂ mass fraction on foam stability and fire extinguishing efficacy were investigated by using the double injector method and the wood stack fire extinguishing test platform. The results show that the nano-SiO₂ significantly enhanced the foam stability and delaye the foam precipitation and foam coarsening; the three-phase class A foam extinguishing agent extinguishe the flame more quickly and efficiently under the same driving pressure without rekindling and at a lower dosage than the traditional class A foam extinguishing agent; and the three-phase class A foam extinguishing agent with 1.5% SiO₂ show the best extinguishing efficacy. The three-phase A-type foam extinguishing agent significantly improves the fire extinguishing efficiency, reduces the consumption of extinguishing agent, and has low cost, which makes it suitable for large-scale forest fires. The study provides a new solution for the efficient extinguishing of forest fires and has a wide range of practical applications.