Abstract: This study attempts to obtain the jet features of perfluorohexanone so as to provide a guidance for the application of perfluorohexanone in fire prevention for large space such as the valve hall. A series of experiments considering different nozzle types and injection pressures were carried out. Results demonstrated that a single orifice nozzle should be employed to achieve the long-distance injection of perfluorohexanone. The spraying distance can reach 18~22 m using the spraying guns of DN 16 and DN 28 under the pressure of 0.8~1.0 MPa. However, the atomization at the end of the jet flow was observed significantly when the spray gun with a larger diameter of DN 40 was used, consequently, the spraying distance was reduced. In addition, the horizontal angle was more conducive to acquiring a long-distance spraying of perfluorohexanone. The coverage of perfluorohexanone was far beyond that of aqueous medium and it was in a range of 6~10 m.

Key words: perfluorohexanone, nozzle, spraying distance, jet characteristics, pressure, flow rate