Fire Sci. Eng. Search

CLOSE


Fire Sci. Eng. > Volume 29(5); 2015 > Article
Fire Science and Engineering 2015;29(5):29-33.
DOI: https://doi.org/10.7731/KIFSE.2015.29.5.029    Published online October 31, 2015.
미세 물분무 노즐의 유동특성에 관한 연구
유우준, 한용택, 김창섭, 김창, 유홍선
1한국소방산업기술원
2한국소방산업기술원
3(주)지에스하이텍
4(주)지에스하이텍
5중앙대학교
An Investigation on the Flow Characteristics of Water Spray Nozzle
Jun You Woo, Han Young Tak, Kim Chang Seob, Kim Chang, Ryou Hong-Sun
1Korea Fire Institute
2Korea Fire Institute
3GS Hitec. Co. LTD.
4GS Hitec. Co. LTD.
5Dept. of Mechanical Engineering, Chung-Ang University
요약
본 연구에서는 노즐의 형상변화에 따라서 방사유량, 살수분포 그리고 액적크기를 측정하였다. 이를 위해서 중심부 직경이 6.0 mm이고 반지름 방향 방사각도가 $142^{circ}$$148^{circ}$인 이중 구조의 미세 물분무 노즐(LPN142, LPN148) 형상을 제작하여 UL2167 시험규격에 의해서 살수분포와 분사거리의 관계를 정량화하였다. Hellium-Neon 레이져에 의한 광학적 분석 방법을 적용하여 방사유량 변화에 따라서 웨버 수와 액적 크기 그리고 방사각도에 관한 경험식을 구하였으며, 전달 방정식의 주요인자인 소멸 항과 액적크기의 상관관계를 분석하였다. 그 결과 이중 구조의 미세 물분무 노즐은 최소허용 유량범위가 결정된 경우 작동압력, 분사거리, 액적 직경을 예측하여 화재특성을 분석함으로써 노즐 선정이 가능할 것으로 사료된다.
Abstract
In this study, the relations of flow rate, discharging distance and droplet size are measured in accordance with the nozzle shape. The dual type nozzles of LPN142 and LPN148, which have identical core diameter (6.0 mm) and the different radial injection angles (${ heta}_2=142^{circ}$ and $148^{circ}$), 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.
Key Words: Dual type nozzle, Sauter mean diameter, Fire intensity, Webber number, Extinction coefficient


ABOUT
BROWSE ARTICLES
EDITORIAL POLICY
AUTHOR INFORMATION
Editorial Office
Room 906, The Korea Science Technology Center The first building, 22, Teheran-ro 7 Gil, Gangnam-gu, Seoul, Republic of Korea
Tel: +82-2-555-2450/+82-2-555-2452    Fax: +82-2-3453-5855    E-mail: kifse@hanmail.net                

Copyright © 2024 by Korean Institute of Fire Science and Engineering.

Developed in M2PI

Close layer
prev next