| 曹建明,蹇小平,李跟宝,韩燕丽,陈志伟,张秋霞,王磊,李雪莉,刘朋,罗明,苏海东,陈文凤.平面液体层碎裂过程实验研究[J].实验力学,2010,25(3):310~318 |
| 平面液体层碎裂过程实验研究 |
| Experimental Investigation on Break-Up Process of Planar Liquid Jet Film |
| 投稿时间：2009-10-12 修订日期：2010-01-18 |
| DOI： |
| 中文关键词: 液膜碎裂长度 空气助力 喷嘴出口宽厚比 射流表面波 |
| 英文关键词:break-up length of liquid film air assistant aspect ratio of nozzle exit surface wave of liquid jet |
| 基金项目:国家自然科学基金项目（编号：50676012） |
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| 中文摘要: |
| 小宽厚比喷嘴喷射出的平面水膜进入静止空气中， 在不同气流流速环境下对水膜碎裂过程进行了实验研究。结果表明，静止空气中的水膜表面波呈现对称波形，射流的碎裂长度随雷诺数的增大而增大，喷射压力对射流碎裂长度没有直接影响。空气助力作用使平面射流表面波的上、下气液交界面出现相位差。水膜的碎裂长度随空气助力气流速度的增大而减小；空气助力对于低雷诺数水膜射流具有很强的促进碎裂作用，所以会极大地改善低雷诺数射流的一次雾化效果。随着水流雷诺数的提高，空气助力作用对水膜碎裂长度的影响大为减弱；即使在高速助力空气的作用下，水膜 |
| 英文摘要: |
| Planar water film was jetted into a stationary air medium with unequal velocity air streams on both sides from a small aspect ratio nozzle. The break-up process of planar water jet film was experimentally studied. Results show that the waveform of water film surface wave is symmetrical, and the length of break-up water jet segment is longer along with the liquid jet Reynolds number increases. Jet pressure has no direct influence on break-up length. Phase difference between upper and bottom gas-liquid interface of planar jet film is formed by air assistant. The length of water film break-up segment decreases along with air stream velocity increases. This indicates that air assistant may strongly promote break-up of water jet with lower Reynolds number. The effect of air assistant on water film break-up length is weak for water jet with larger Reynolds number. Liquid film remains stable for long time, and liquid film rip phenomenon did not appear even for high velocity air assistant. It is presented that high Reynolds number of liquid jet is a stable factor for Rayleigh mode jet from small aspect ration nozzle. Comparing with some dimensionless parameters, such as gas-liquid velocities ratio and Mach number, Reynolds number is a main influence factor for liquid jet break-up process. |
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