The control of the effect of fine water mist on new energy vehicle fires in highway tunnels

Abstract

To explore the control effect of fine water mist on new energy vehicle fires in a tunnel, a numerical calculation model was established. This study explored the impact of various factors on the efficacy of high-pressure fine water mist fire extinguishing systems. These factors include the heat release rate, fire source location, the characteristics of fine water mist and the spatial arrangement of nozzles. The results showed that a decrease in the fire source's power led to a reduction in the heat released per unit time, thereby enhancing the fire extinguishing effectiveness. With the increase in the distance between the fire source and one side of the wall, the contact area between water droplets and the fire source expanded, resulting in improved fire suppression. An increase in the nozzle flow rate led to a higher number of spray droplets per unit time. Within a specified range, finer particle sizes of the fine water mist exhibited superior fire-extinguishing capabilities. Moreover, a greater flow rate of fine water mist directed towards the fire source resulted in a more effective fire suppression. This study contributes to fire safety in the domain of new energy vehicles operating within highway tunnels.