Experiment study on fire extinguishing effects of airflow-water synergistic jet

As an important forest firefighting equipment in China, the 6 MF-30 pneumatic fire extinguisher has the problem of engine overheat resulting in rotational speed reduction during application. Adding water as a medium to form an airflow-water synergistic jet can improve the fire extinguishing effect. In this paper, through experiments, flow field analysis was carried out on the wood crib fire extinguishing scene and fire extinguishing effects were analyzed. It was found that the extinguisher with a rotational speed below a certain degree could not extinguish the wood crib fire. The airflow-water synergistic jet can effectively improve the fire extinguishing efficiency, greatly reduce the fire extinguishing time, and reduce the risk of reignition. The best effect is to use 4 nozzles to inject water into the outlet of the air duct, which can achieve the effect of direct injection with water pipe in the case of limited water source.