Abstract: An experimental investigation was conducted to evaluate the fire extinguishing performance of the perfluorohexoane fire suppression system in local application scenarios. Three typical fire models were selected: 70B oil pool fire, three-dimensional fire, and wood crib fire. A test platform for local application fire suppression was designed and constructed to measure key parameters such as agent dosage, discharge time, extinguishing time, and nozzle pressure. The results indicate that the perfluorohexoane system demonstrated excellent fire suppression capabilities across all three fire models, effectively suppressing flames rapidly and preventing reignition. The critical discharge parameters for local application were identified as nozzle pressure, spray angle, discharge time, and droplet size. For 70B oil pool fires, a nozzle pressure exceeding 1 MPa was required to suppress the flames, while excessive pressure should be avoided to prevent splashing. For three-dimensional fires, the spray angle must fully cover the protected object with a safety margin of at least 0.6 m below the midpoint of the object. For 3A wood crib fires, optimal extinguishing efficiency was achieved with a droplet size (DV0.99) ≤200 μm.

Key words: perfluorohexoane, fire suppression system, fire model, local application, fire extinguishing performance