Liquid sheet dynamics and primary breakup characteristics at impingement type injector
Liquid sheet dynamics and primary breakup characteristics at impingement type injector
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DOI：
10.2514/6.2009-5041
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
C. Inoue;Toshinori Watanabe;T. Himeno
中科院分区：
文献类型：
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作者：
C. Inoue;Toshinori Watanabe;T. Himeno
针对撞击式喷油器喷射条件，特别是喷射速度分布与液片雾化特性的关系，进行了数值分析、实验观察和理论分析。对于雾化现象的计算，提出了一种数值方法。通过与相应掐断实验的定量比较，验证了该方法的有效性。在此基础上，对两束反方向水射流碰撞产生的轴对称液片雾化进行了实验和理论研究。通过开尔文-亥姆霍兹不稳定性对雾化过程的数值计算结果与相应的理论分析结果在定性上相似。阐明了注射速度分布不均匀导致速度分布在板材内部出现拐点的原因。因此，注射速度分布不均匀的薄板往往不稳定，雾化增强。讨论了喷射速度分布对撞击式喷油器雾化的影响。
Aiming at elucidating the relationship between injection conditions, especially injection velocity profiles, and atomization characteristics of liquid sheet at the impingement type of injector, numerical analysis, experimental observation and theoretical analysis were carried out. For computing atomization phenomena, a numerical method has been developed. The method was verified through quantitative comparisons with corresponding experiment of pinch off. Then experimental and theoretical studies were performed on atomization of axisymmetric liquid sheet, which was produced by collision of two water jets in opposite direction. The numerical results of the atomization process through Kelvin-Helmholtz type of instability showed qualitative resemblance with corresponding theoretical analyses. It was clarified that non-uniform injection velocity profile resulted in velocity distribution with inflection point inside the sheet. Thus the sheet with non-uniform injection velocity profile tended to be unstable and enhanced atomization. The effect of injection velocity profile on atomization at the impingement type injector was also represented.