LDV/APV系统研究纵向通风作用下细水雾雾场特性

Experimental study on the water mist under longitudinal ventilation using LDV/APV system

构建了小型低速风洞,利用三维激光多普勒测速计和自适性相位多普勒速度计系统(三维LDV/APV系统),通过观察和测量超声雾化细水雾在不同纵向风速影响下的运动特性,获取了细水雾的平均速度、平均粒径和雾通量等特性参数,实验结果表明,实验空间内同一截面上雾滴速度分布与风速呈两段式的线性变化,增加通风后雾滴粒径显著增大并趋于稳定,而雾通量也呈线性增长;雾滴速度和粒径受雾滴运动距离的影响很小,但是雾通量会随着运动距离的增加明显减小。实验结果对纵向通风条件下细水雾灭火设计具有一定的指导意义。

The Laser Doppler Velocimetry（LDV） or Adaptive Phase Doppler Velocimetry（APV） system was used to study the water mist flow field under longitudinal ventilation.The water mist characteristics： mean velocity,volume mean size and volume flux were obtained.The results indicate that in the same cross section mean velocity of water mist increases as airflow velocity increases,but displays as two step linear fitting.Experiments deepened the understanding of the mechanics of water mist induced by a jet and provided better conditions for experiment of water mist induced by flame in the next step.