Study on the influence of nozzle interval on the extinguishing performance of water mist system in the cable cabin of utility tunnel
GUO Weijian
Abstract：In order to study the key parameter and fire extinguishing performance of water mist system in urban utility tunnel,FDS software is used to establish the cable cabin model of a utility tunnel,and the influence of the change of the water mist nozzle interval on the fire extinguishing time,the height of the smoke layer and the concentration of CO is analyzed.Accordingly,the optimized design parameter of the water mist system is deter-mined,so as to provide a reference for the water mist system design and application in the actual project.The results show that:with the increase of nozzle spacing,the smoke layer height tends to descend,the CO concen-tration first declines and then rises,while the fire extinguishing time first increases and then decreases.The best fire extinguishing performance of water mist system is achieved with nozzle interval of 3m,and the fire ex-tinguishing mechanism is smothering.
Keywords：utility tunnelcable cabinwater mist systemnumerical simulationfire protection engineering
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 78-82 )