미세 물분무 노즐의 유동특성에 관한 연구

초록

In this study, the relations of flow rate, discharging distance and droplet size are measured in accordance with the nozzleshape. The dual type nozzles of LPN142 and LPN148, which have identical core diameter (6.0 mm) and the differentradial injection angles (θ2 = 142o and 148o), are manufactured. The distribution diameters with discharging distance arequantified by UL2167 test standard. The relations between discharging angle and droplet sizes, which are measured by themethod 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 variabledroplet sizes. Thus, it is possible to opt the nozzle’s shape by analyzing the relations of working pressure, spraydistance, droplet size and fire characteristics at minimum allowable flow rate.

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