Abstract:

Water mist nozzle is the key component of water mist fire extinguishing system. In this paper, laser Doppler tester (LDV) and phase Doppler particle tester (PDPA) are used to study the atomization experiment of a swirling nozzle. The distribution of nozzle flow rate, flow characteristic coefficient K, atomization cone angle θ, horizontal range, average particle size (SMD) and axial velocity of particles under different test pressures were obtained by experiments. Finally, the relationship of these parameters with test pressure was obtained. The water mist sprinkler in this work has large axial and radial momentum, which is beneficial to extinguishing deep fire and expanding the fire extinguishing range.

Key words: water mist system, swirling type, nozzle, atomization