An Investigation on the Flow Characteristics of Water Spray Nozzle

• Journal title : Fire Science and Engineering
• Volume 29, Issue 5,  2015, pp.29-33
• Publisher : Korea Institute of Fire Science and Engineering
• DOI : 10.7731/KIFSE.2015.29.5.029
Title & Authors
An Investigation on the Flow Characteristics of Water Spray Nozzle
Jun, You Woo; Han, Young Tak; Kim, Chang Seob; Kim, Chang; Ryou, Hong-Sun;

Abstract
In this study, the relations of flow rate, discharging distance and droplet size are measured in accordance with the nozzle shape. The dual type nozzles of LPN142 and LPN148, which have identical core diameter (6.0 mm) and the different radial injection angles ($\small{{\theta}_2=142^{\circ}}$ and $\small{148^{\circ}}$), are manufactured. The distribution diameters with discharging distance are quantified by UL2167 test standard. The relations between discharging angle and droplet sizes, which are measured by the method of Helium-Neon laser equipment, are obtained by the empirical correlation as working pressure increase. Moreover, the extinction coefficient, which is major parameter of the radiative transport equation (RTE) is analyzed with variable droplet sizes. Thus, it is possible to opt the nozzle's shape by analyzing the relations of working pressure, spray distance, droplet size and fire characteristics at minimum allowable flow rate.
Keywords
Dual type nozzle;Sauter mean diameter;Fire intensity;Webber number;Extinction coefficient;
Language
Korean
Cited by
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