Browse > Article

A Numerical Simulation of the Effect of the Injection Angle and Velocity of the $CO_2$ Agent Nozzle on the Characteristics of $CO_2$ Concentration Distribution  

Park, Chan-Su (목포해양대학교 기관시스템공학부)
Publication Information
Fire Science and Engineering / v.20, no.2, 2006 , pp. 44-53 More about this Journal
Abstract
We have conducted a numerical simulation under two-dimensional unsteady conditions in order to analyze the effect according to the injection angle and velocity of the $CO_2$ agent nozzle which is one of the elements for the fixed type $CO_2$ fire extinguishing system installed in a ship on the characteristics of flow and $CO_2$ concentration distribution. The flow fields and concentration fields were measured and analyzed. We can found that the difference of flow patterns according to the conditions of $CO_2$ agent injection nozzle, and in all the conditions of $CO_2$ agent injection nozzle, the iso-concentration line was expanded from the region at which vortex was generated to the surroundings. We can expected that the intensity of the wall jet on the bottom floor was generated differently and the iso-concentration lines were expanded or shrunk according to the angle of $CO_2$ agent injection nozzle. In case of increasing $CO_2$ agent injection velocity maintaining the flow quantity of the $CO_2$ agent injection equally, the iso-concentration line of $CO_2$ agent on bottom floor can be formed more higher than in case of decreasing $CO_2$ agent injection velocity.
Keywords
The angle of $CO_2$ agent nozzle; $CO_2$ concentration distribution; Wall jet;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Nader Vahdat and Yong Zou, 'Fire-extinguishing Effectiveness of New Binary Agents', Fire Safety Journal 38, pp.553-567(2003)   DOI   ScienceOn
2 김윤중, 윤명오, '용기 일체형 가스소화 방식의 오리피스 방사특성에 관한 연구', 한국화재소방학회, 제16권, 제2호, pp.2-9(2002)
3 S. C. Kim and H. S. Ryou, 'An Experimental and Numerical Study on Fire Suppression Using a Water Mist in an Enclosure', Building and Environment, 38, pp.1309-1316(2003)   DOI   ScienceOn
4 Juisheng Li, 'Effect of Pressure and Nozzle Shape on the Characteristics of Sprinkler Droplet Spectra', J. agric. Engng Res., pp.15-21(1997)
5 박승민, '가스계 소화설비의 개구부를 통한 소화약제 누출 및 보상문제에 관한 소고', 한국화재소방학회, 제16권, 제3호, pp.77-83(2000)
6 Anthony Hamins, 'Flame Extinction by Sodium Bicarbonate Powder in a Cup Burner', Twenty-Seventh Symposium on Combustion, pp.2857-2864 (1998)