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| Abstract: |
| A theoretical and experimental investigation on the liquid breakup regimes of slinger is presented in this paper. The theoretical results show that in the round orifice of the slinger, if the contact angle between the liquid and the wall is less than 90°, the liquid surface tension will inhibit the liquid lateral flowing under the Coriolis force. The formula used to predict the liquid regime leaving the orifice in the past was proved to be inaccurate, which is explained by two assumptions presented in this paper. The breakup regimes of the liquid film are related to the Weber number, and the characteristic length of the Weber number is equivalent to the thickness of the liquid film. The liquid film performed subcritical breakup when the Weber number was small and performed supercritical breakup when the Weber number was large. But when the Weber number was in the middle state, the breakup regimes could not be determined. The liquid breakup regimes affected the primary breakup of the liquid, but a lot of tiny droplets were produced in the secondary breakup, which led to poor correlation between the spray Sauter Mean Diameter (SMD) and the Weber number corresponding to various liquid breakup regimes. On the whole, the spray SMD performs a power relationship with the Weber number corresponding to the liquid film regime, and the correlation coefficient is close to 0.9. |
| Key words: rotary atomization slinger liquid breakup regime spray SMD |
| DOI：10.11916/j.issn.1005-9113.20056 |
| Clc Number:V231.2+3; TK16 |
| Fund: |
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| Descriptions in Chinese: |
| 甩油盘液体破碎形态及雾化性能研究 覃文隆 （中国飞行试验研究院,西安 710089） 摘要：在Dahm的研究基础上，对甩油盘的液体形态、雾化性能等进行研究。在圆形出孔中，当液体与壁面之间夹角小于时，表面张力会阻止液体在科氏力作用下聚集到出孔一侧。Dahm提出的判定液柱、液膜形态的公式并不能准确衡量液体的形态，提出排水池假说、相对滑移假说来解释此现象。sub与super与韦伯数相关，当we小是为sub，we大时为sup，而当we在中间状态时无法判定。液体的一次雾化与相应特征长度下的we有关，但二次雾化会产生大量微小液滴，液雾SMD与相应特征长度下We相关系数不大。整体上液雾SMD与We成指数关系，特征长度为出孔内液膜厚度，相关系数接近0.9。 关键词：旋转雾化，甩油盘，液体破碎形态，液雾SMD |
