小流量气泡雾化喷嘴研究

对小流量气泡雾化喷嘴的流量和雾化特性进行了实验研究，发现喷嘴的流量特性比较复杂，气体流量和液体流量之间相互影响，不能独立控制某一方面。颗粒直径沿径向的分布呈现逐渐增大的趋势。较大的气液压差情况下的雾化效果较好。对于不同的设计流量、喷嘴出口截面的大小对雾化质量影响较小。空气注入孔直径越小，其雾化质量越好。使用多孔介质注入空气时的才轮质量好于小孔射流注气，即均匀注入空气有利于提高雾化效果。另外建立了一个可以用于直接计算颗粒分布的雾化模型，计算结果与实验结果符合良好。

Studies on Low Mass Flow-rate Effervescent Atomiz er

The flow rate characterisitcs and atomization performance of the low mass flow rate effervescent atomi zer are studied in this investigation.The flow rate characteristics of this atomizer is complex,and it is impossible to control the air and liquid mass flow rate independently.The Sauter mean diameters along radial position increase with the increase of the distance to axis.A higher difference between the pressure of air and liquid could improve the atomization performance.For different liquid mass flow rates,the Sauter mean diameter is not dependent upon the exit orifice.The atomization performance of this atomizer is sensitive to the area of air injector,the smaller the air inject orifice is,the higher the atomization quality is.Using porous media as air injector could improve the atomization performance.A model was developed to explain the atomization process,and the calculated results accorded with the results of experiment well.