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http://dx.doi.org/10.7731/KIFSE.2019.33.1.099

Effect of Absorbent Thickness on the Noise Level Reduction of Fire-Extinguishing Nozzle  

Kim, Hak-Sun (Graduate School of Mechanical Engineering, Sungkyunkwan University)
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 University)
Publication Information
Fire Science and Engineering / v.33, no.1, 2019 , pp. 99-104 More about this Journal
Abstract
In a gas system fire extinguishing system, extinguishing agents are usually stored with approximately 280 bar at $21^{\circ}C$ and are released at approximately 8 MPa through the decompression valve and orifice to quickly suppress the fire. When extinguishing agents are discharged, they cause a loud noise (approximately 140 dB), which can damage electronics, such as hard disk drives (HDDs). Therefore, the noise is becoming a serious issue in the gas extinguishing system. The method of the noise reduction by adding an absorbent is most general and in this study, the thickness of the absorbent was as a selected design variable. The noise level at the observation point and the flow characteristics inside the nozzle were numerically calculated and analyzed using the commercial code ANSYS CFX ver. 18.1.
Keywords
Fire suppression; Gaseous extinguishing nozzle; Absorbent; Sound pressure level (SPL); Computational fluid dynamics (CFD);
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