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中文摘要：
利用LSA-III型激光粒度测试仪对水射流雾化的雾滴谱随速度和空间变化特性进行了试验研究,得到了雾滴谱液滴直径随速度增加而减小,随速度的增加变得更均匀的结果。雾滴谱的索特尔平均直径从轴心向两侧边缘变小,且上侧比下侧的更小,并随速度和离开喷嘴出口距离的增大,这种变化趋势在减弱。速度为27m/s和35.3m/s时射流雾化实际上处于风生破碎阶段,并由于二次雾化破碎,液滴直径沿轴向减小;速度为93.5m/s和121.6m/s时的射流二次雾化范围很短,并由于碰撞的原因,液滴直径沿轴向增大。
英文摘要：
An experimental study was conducted to measure droplet spectrum of water jet with a LSA-III laser granularity instrument and to study variations of droplet spectrum along with local velocity and location of the jet trajectory.The results show that the droplet diameters decrease with the local velocity and that their distribution is more uniform at the locations of greater velocity.Sauter mean diameter（SMD） of droplets decrease from the core to boundaries on a jet cross section,and this decrease is more intense near the upper boundary than the bottom one,while the decreasing is weakened under a smaller initial velocity or at a cross section further downstream.In the range of jet velocity from 27m/s to 35.3m/s,droplet breaking is primarily caused by jet wind and secondary breaking makes the droplets even smaller so that their diameters decreases toward downstream along the jet.In the range from 93.5m/s to 121.6m/s,however,secondary breaking is not so significant and the diameters of droplets under their mutual collision actually increase toward downstream.
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