The fire-extinguishing efficiency of compressed gas protein foam with different gas–liquid ratio on diesel pool fire was studied by a laboratory-scale fire suppression experiment. The 25% drainage time, expansion ratio and fire-extinguishing efficiency of 6% protein foams (PF) with the gas–liquid ratio in the range of 5–24 were tested. The results show that as gas–liquid ratio increases, both the 25% drainage time and expansion ratio increase. In the fire-extinguishing process, the temperature drop rate increases at the beginning and then decreases with the increase of gas–liquid ratio. When the gas–liquid ratio is 20, the foam shows the optimal equilibrium between the fluidity and stability, thus exerting the maximum temperature drop rate of 6.86 K s⁻¹ corresponding to the best fire-extinguishing efficiency. The main fire-extinguishing mechanism of PF in pool fire is ascribed to the combined actions of cooling effect and barrier effect. By adjusting the gas–liquid ratio in the range of 16–24, the PF can exert excellent fire-extinguishing efficiency in pool fire by diluting the combustible gases and isolating the transmission of heat and oxygen between combustion zone and fuel.

通过实验室规模的灭火实验研究了不同气液比的压缩气体蛋白泡沫对柴油机池火的灭火效率。测试了气液比在5–24范围内的6％蛋白泡沫（PF）在25％的排水时间，膨胀率和灭火效率。结果表明，随着气液比的增加，25％的排水时间和膨胀率均增加。在灭火过程中，温度下降率从一开始就增加，然后随着气液比的增加而下降。当气液比为20时，泡沫显示出流动性和稳定性之间的最佳平衡，因此发挥了6.86 K s ^-1的最大降温速率对应最佳的灭火效率。游泳池火灾中PF的主要灭火机理归因于冷却作用和屏障作用的综合作用。通过在16–24的范围内调整气液比，PF可以通过稀释可燃气体并隔离燃烧区和燃料之间的热量和氧气的传递，在池火中发挥出色的灭火效率。