Influence of water spray on fire suppression performance and ceiling temperature of tunnel shelter fire
As an effective firefighting facility,water spray system is widely used in tunnels.Based on a 1:8 reduced scale double-layer tunnel platform(36 m long and a clear height of 0.58 m for each single-layer tunnel),this study carried out experiments in the lower deck space of the model and explored the effects of wa-ter spray system working pressure,opening time,spray section and number of opening sections on the fire control effect.Findings reveal a dual effect of water mist interaction with flames,with both enhancing flame intensity and inhibiting combustion,the lat-ter being more pronounced with higher water spray pressures.When the water spray pressure exceeds 0.30 MPa,fire suppres-sion becomes the dominant factor.The extinguishing time of fire source decreases with the increase of water spray sections.The earlier the water spray system is started,the more quickly and ef-fectively the fire temperature can be controlled at alower level,while delayed activation leads to high-temperature vaporization,hindering combustion and attenuating fire progression.Impor-tantly,the water spray sections have a significant influence on the temperature distribution in tunnel.
万方数据
维普
