• Journal of the Korean Society of Visualization
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• v.22 no.3
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• pp.37-44
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• 2024

The Firefighting Monitor is essential for large-scale firefighting, but the reaction force generated during high-pressure water discharge poses control challenges. In robotic control systems, reaction forces can reduce the precision of spraying operations. In this paper, we aim to determine the optimal design of decompression equipment to mitigate reaction forces in nozzles. Three configurations (None, Orifice, and Airfoil) were designed and evaluated using Computational Fluid Dynamics (CFD) simulations. The results demonstrated that the Airfoil shape exhibited the lowest upward reaction force and superior performance in terms of reaction force reduction under four inlet pressures and both at 0° and 45° conditions. The Airfoil shape was identified as the most effective in reducing reaction forces and improving flow stability.

• Journal of the Korean Society of Industry Convergence
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• v.26 no.5
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• pp.907-913
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• 2023

Currently, the sprinkler method is widely used as an initial suppression method in existing firefighting systems. However, this method can cause significant damage to both equipment and facilities in the hydration area. To minimize this damage, fire extinguishing monitors are being developed that can spray fire extinguishing water directly at the point of fire. These monitors are installed on the top floor of the ship, such as the Living Quarter and Ventilation System. While conventional fire extinguishing monitors focus on lightweight research with a short spray port and require a spray distance of about 40 to 45m, recent developments necessitate a longer spray port, similar to a water cannon, requiring a spray distance of about 70 to 75m. This study aims to predict the injection distance of both the existing ship-installed fire extinguisher and the long spray port fire extinguisher through hydrodynamic computer analysis, and to determine whether the injection distance has increased.