气体与液体双流体喷雾的工业应用已较为成熟,三流体喷雾作为一种较新的喷雾方式,目前工业应用与相关研究均较少.针对一种三流体雾化喷嘴,搭建喷雾与测试实验台,利用高速摄像仪与相位多普勒粒子测试仪(PDPA)对三流体喷嘴甘油、水与压空雾化特性进行研究.探讨分析气液质量比(ALR)对液滴直径与速度的影响,以及直径与速度轴向与径向空间分布特性.研究发现当ALR范围为0.327 ～0.518时,液滴直径随ALR变化较小.液滴直径与速度空间分布极不均匀,喷嘴出口附近存在液滴直径随轴向距离增加而快速下降与液滴加速现象.此外,不同喷雾轴向距离下,中心部位的液滴比喷雾边缘更细小.%Twin-fluid atomization by gas and liquid has been widely used in the modern industry.Few studies have been conducted on the three-fluid atomizer.A test rig using a nozzle was constructed to explore the atomization characteristics of glycerol/water/compressed air spray.Spray patterns were captured by a high-speed camera,while droplet diameter and particle velocity were measured by a phase Doppler particle analyzer (PDPA).The relationships between the air-liquid ratio (ALR) and the atomization spatial properties,including droplet Sauter diameter and mean velocity,were investigated.It is found that droplet Sauter diameter varies slightly with ALR in the range from 0.327 to 0.518.Droplet diameter and velocity show strong non-uniformity in the spray field.Near the nozzle exit droplet diameter decreases rapidly while droplets are accelerated leading to higher droplet velocity.At different axial positions,the atomization effects show a similar trend that the atomization is finer in the center area of the spray than in the margin.
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