压力螺旋型喷嘴雾化特性及灭火有效性实验

Experimental Study on Spray Characteristics and Fire Suppression Performance of Pressure Swirl Nozzle

为了优化压力螺旋型喷嘴参数,设计了压力螺旋型细水雾灭火喷嘴并进行了实验,分析了压力螺旋型喷嘴设计参数、系统压力和添加剂对雾化特性的影响.结果表明：当系统压力从0.5 MPa增加到1.5 MPa时,细水雾的索太尔直径减少8%;水中的添加剂可以降低雾的索太尔直径1.3%-15%;雾场中雾的索太尔直径越大,粒径分布越宽;粒径体积分数分布曲线有向大粒径方向移动的趋势;雾的速度与系统压力成近似线性增大关系;当喷嘴结构设计不合理时,喷嘴下游平面上的雾通量分布会不均匀,对熄灭火灾不利.

A pressure swirl nozzle for water mist fire suppression was developed and experimentally studied to optimize the parameters of the nozzle.The influences of the design parameters,the operating pressure,and the additive to plain water on spray characteristics were also investigated.The results show that the Sauter mean diameter（SMD） of droplets was decreased by 8% when the operating pressure was increased from 0.5 to 1.5 MPa;and that adding additive in water could decrease the SMD by about 1.3% to 15%.What＇s more,the larger the SMD of mist droplets,the wider the range of droplet diameter distribution;and the trend that the volume fraction curve of droplet diameter shifts towards the large diameter direction was also found.The relationship between the mist velocity and the operating pressure was approximately a linear positive dependence.When the nozzle structure was not properly designed,the downstream distribution of the water mist flux would not be uniform,which is disadvantageous to fire suppression.