叶型甩油盘雾化特性研究

Investigation on Atomization Characteristics of Slinger with Blades

关键词:  甩油盘  旋转雾化  液雾分布  多普勒相位分析仪

Key words:  Slinger  Rotating atomization  Spray distribution  PDPA

摘要:

为提高甩油盘雾化质量，采用试验研究方法，对一种叶型甩油盘三个出口的液雾特性分别进行了研究，并与圆出孔甩油盘进行对比。研究表明，转速增加，液雾SMD（索太尔平均直径）减小，浓度变大；流量增加，液雾浓度变大，圆出孔甩油盘液雾SMD变大，叶型甩油盘液雾SMD变化不规律。甩油盘液雾SMD与浓度整体上呈反比，SMD大的地方浓度小，SMD小的地方浓度大。液雾SMD随径向距离增加先减小后增大，转速大于12kr/min后，SMD最小点距出口径向距离约20mm。相同流量、转速下，圆出孔甩油盘液雾SMD更小，但叶型甩油盘液雾均匀性更好，轴向分布范围更广。在叶型甩油盘出口后开槽可以显著减小液雾SMD，锯齿型出口可以增加液雾浓度及减小低转速下液雾SMD。

Abstract:

In order to improve the atomization quality of slinger, the atomization characteristics of a blade slinger with three different outlets was studied by experimental research methods, and compared with the slinger with only one round hole. The research shows that the spray SMD (Sauter mean diameter) becomes smaller and the concentration decreases as rotating speed increases. When flowrate increases, the spray concentration increases, the slinger with one round hole’s spray SMD become larger but the blade slinger’s spray SMD changes irregularly. The spray SMD is inversely proportional to the concentration as a whole, where the SMD is smaller, the concentration is larger; where the SMD is larger, the concentration is smaller. The spray SMD first becomes smaller then becomes larger with the increase of radial distance. When the rotating speed is greater than 12kr/min, the minimum SMD point is about 20mm away from the outlet in radial distance. Under the same flowrate and rotating speed, the slinger with one round hole’s spray SMD is smaller, but the blade slinger’s spray has better uniformity and a wider axial distribution range. Slotting after the outlet of blade slinger can significantly reduce the spray SMD; the zigzag outlet can increase the spray concentration and reduce the spray SMD when the rotating speed is low.