Abstract
Fire-extinguishing equipment that can be used to suppress unexpected fire and that can minimize its damage is essential in all industries. Different fire-extinguishing agents and nozzle types have been introduced depending on the type of objects to protect, and various studies have been accordingly conducted. However, only a few of these studies have focused on the exhaust noise from fire-extinguishing systems. This noise can damage the electrical equipment; hence, the investigation of this noise is necessary. Computational fluid dynamics software ANSYS FLUENT ver. 18.1 was used herein. A numerical analysis was conducted to analyze the fluid flow characteristics depending on the turbulent treatment methods. Subsequently, the noise was calculated. The turbulent treatment methods considered here were Reynolds-averaged Navier-Stokes simulations and large eddy simulation. Furthermore, the Ffowcs Williams-Hawkings equation was used to calculate the noise. Consequently, the averaged velocity and pressure values are similarly described, while the frequency graphs of the noise and eddy of fluctuation are separately shown.
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