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http://dx.doi.org/10.7731/KIFSE.2019.33.4.077

Influence of the Nozzle Contraction Angles of Gaseous Extinguishing Systems on Discharge Noise  

Kim, Yo-Hwan (Graduate School of Mechanical Engineering, Sungkyunkwan Univ.)
Yoo, Han-Sol (Graduate School of Mechanical Engineering, Sungkyunkwan Univ.)
Hwang, In-Ju (Department of Future Technology and Convergence Research, Korea Institute of Civil Engineering and Building Technology)
Kim, Youn-Jea (School of Mechanical Engineering, Sungkyunkwan Univ.)
Publication Information
Fire Science and Engineering / v.33, no.4, 2019 , pp. 77-82 More about this Journal
Abstract
Fire extinguishing systems are essential equipment in all indoor facilities to address unexpected fire scenarios, and appropriate fire extinguishing agent should be used depending on the place and object to protect. Among these, gaseous fire-extinguishing systems are used to protect electronic equipment. Therefore, inert gases that do not undergo chemical reactions are used mainly in those systems. On the other hand, recently, owing to the high integration of electronic equipment, there are some cases, in which large noise generated from gaseous systems damage the electronic equipment. In this study, numerical analysis of the discharge noise with various nozzle contraction angles was carried out to improve the gas fire extinguishing system. Numerical analysis was carried out using ANSYS FLUENT ver 18.1. The causes of the noise were elucidated using the swirl distribution. The noise level of the modified model was reduced by approximately 6 dB compared to the reference model, which is similar to the result of a previous study, confirming the validity of the method.
Keywords
Fire extinguishing nozzle; CFD; CAA; Clean extinguishing agent;
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