Influence of Gas-Injector Geometry on Atomization Performance of Aerated-Liquid Nozzles
Influence of Gas-Injector Geometry on Atomization Performance of Aerated-Liquid Nozzles
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DOI：
10.1515/tjj.1989.6.3-4.271
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发表时间：
1989-12
期刊：
影响因子：
--
通讯作者：
X. Wang;J. Chin;A. Lefebvre
中科院分区：
文献类型：
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作者：
X. Wang;J. Chin;A. Lefebvre
本文研究了充气液体喷嘴的雾化性能，着重研究了气体喷嘴几何形状对喷雾特性的影响。使用马尔文喷雾分析仪测量平均液滴尺寸和液滴尺寸分布。所有测量都是在正常大气压力和温度下向空气中喷水时进行的。使用的气体是氮气。喷射压力从34.5到690 kPa（5到100 psid）变化，气/液质量比从0.002到0.023变化。使用两个不同的气体喷射器，一个具有0.63 mm直径的单个孔，另一个具有20个孔，每个孔的直径为0.5 mm。选择这两种配置是为了提供气体喷射器几何形状的广泛变化。它们与三个喷射器孔直径一起使用。液体流量的测量结果表明，喷嘴孔直径为0.8，1.6，和2.4毫米。结果表明，雾化质量主要取决于喷射压力和气/液比，并不敏感的气体喷嘴的几何形状和喷嘴孔直径。液体流量的测量表明，喷射器孔具有非常低的流量系数。这在待雾化的液体包含固体颗粒或污染物的应用中可以证明是非常有利的，所述固体颗粒或污染物将倾向于阻塞常规喷嘴的小孔和通道。
The atomizing performance of an aerated-liquid nozzle is examined with special emphasis on the influence of gas-injector geometry on spray characteristics. A Malvern spray analyzer is used to measure mean drop sizes and drop-size distributions. All measurements are carried out when spraying water into air at normal atmospheric pressure and temperature. The gas employed is nitrogen. Injection pressures are varied from 34.5 to 690 kPa (5 to 100 psid) and gas/liquid mass ratios from 0.002 to 0.023. Two different gas injectors are used, one having a single hole of 0.63 mm diameter, and the other 20 holes, each of 0.5 mm diameter. These two configurations were selected to provide a wide variation in gas-injector geometry. They are used in conjunction with three injector-orifice diameter. Measurements of liquid flow rates indicate that the injector orifice diameters of 0.8, 1.6, and 2.4 mm. The results show that atomization quality depends mainly on injection pressure and gas/liquid ratio, and is less sensitive to gas-injector geometry and injector-orifice diameter. Measurements of liquid flow rates indicate that the injector orifice has a very low discharge coefficient. This could prove very advantageous in applications where the liquid to be atomized contains solid particles or contaminants that would tend to block the small holes and passages of conventional nozzles.