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| 油滴撞击结构壁面油膜的形态以及动力学特性研究 |
| Morphological and Kinetic Characteristics of the Oil Droplet Impacting the Oil Film on Structural Wall |
| 投稿时间：2024-07-03 修订日期：2024-09-25 |
| DOI： |
| 中文关键词: 粗糙度 不稳定性 冠状结构 飞溅 |
| 英文关键词:Wall roughness Instability Crown Splash |
| 基金项目: |
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| 中文摘要: |
| 在轴承空腔内进行油、气润滑时，会产生一种油滴与壁面油膜碰撞的现象，这种现象会对轴承腔的润滑和传热产生重要的影响。因此本文采用高速摄像机对油滴撞击结构壁面油膜进行可视化实验研究，通过改变壁面粗糙度、韦伯数对撞击后形态以及动力学特性进行研究。实验结果表明：根据无量纲壁面粗糙度以及韦伯数的关系，将撞击过程中的形态划分为4种模态。同时，分析出飞溅现象是由K-H不稳定性以及P-R不稳定性共同作用下导致的。无量纲壁面粗糙度和韦伯数的增加会使冠状边缘不稳定性增强，从而导致飞溅现象剧烈，因此得出撞击后冠状结构的演变以及飞溅现象与二者密切相关的结论。 |
| 英文摘要: |
| It will occur a collision between the oil droplet and oil film on the wall, which affects the lubrication of bearing cavities and the heat transfer. In this paper, the high-speed camera is utilized to make the visualization research for the phenomenon of the oil droplet impacting the oil film on the wall. Furthermore, the form and dynamics of the oil droplet are investigated by changing the roughness of the wall and Weber number. The experimental results indicate that the morphology during impact can be divided into four modes according the relationship between non-dimensional roughness of the wall and Weber number. Additionally, the spatter phenomenon is a result under the combined action of K-H instability and P-R instability. Moreover, increases in the non-dimensional roughness and the Weber number affect the stability of crown margin, which will lead to severe the splash phenomenon. Therefore, it is concluded that the evolution and the spatter of the coronal structure are closely related to the roughness and the Weber number. |
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