Experimental study on spraying characteristics and extinguishing performance of improved water mist nozzle

doi:10.16265/j.cnki.issn1003-3033.2017.07.011

Abstract

Abstract: In order to improve atomization effect of the nozzle, 14 types of water mist nazzles were designed according to atomizated core structure features.Employing laser particle size analyzer and water mist evalution device, the dependencies of atomization effect on atomization chip design parameters were invesitigated.Furthermore, the working pressure and additive concentration corresponding to the optimal fire extinguishing performance of the advenced nozzle were evaluated. The results show that the best atomization effect can be brought about by the water mist nozzle having four swirl chambers when droplet size (X₉₀) is 110.578 μm, that the fire extinguishing efficiency can be improved by 17.4％by increasing the working pressure from 8 MPa to 12 MPa, however the efficiency it will not be improved if the pressure is more than 12 MPa, and that adding sodium dodecyl benzene sulfonate(SDBS) to the water would enhance fire extinguishing performance especially the additive concentration is at 0.4 g/L.

Key words: water mist, sprinkler head, fire extinguishing, atomization, parameter

CLC Number:

X932

CHEN Jian, XU Kaili. Experimental study on spraying characteristics and extinguishing performance of improved water mist nozzle[J]. China Safety Science Journal, 2017, 27(7): 59-64.

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