\r裴毅强¹，朱庆洋¹，彭志军¹，秦 静^{1, 2}，卢莉莉¹，彭振山¹，刘 懿\r¹\r
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AuthorsHTML:\r裴毅强¹，朱庆洋¹，彭志军¹，秦 静^{1, 2}，卢莉莉¹，彭振山¹，刘 懿\r¹\r
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AuthorsListE:\rPei Yiqiang¹，Zhu Qingyang¹，Peng Zhijun¹，Qin Jing^{1, 2}，Lu Lili¹，Peng Zhengshan¹，Liu Yi\r¹\r
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AuthorsHTMLE:\rPei Yiqiang¹，Zhu Qingyang¹，Peng Zhijun¹，Qin Jing^{1, 2}，Lu Lili¹，Peng Zhengshan¹，Liu Yi\r¹\r
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Unit:\r\r1. 天津大学内燃机燃烧学国家重点实验室，天津 300072；\r
\r\r2. 天津大学内燃机研究所，天津 300072\r
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Unit_EngLish:\r1. State Key Laboratory of Engines，Tianjin University，Tianjin 300072，China；
2. Internal Combustion Engine Research Institute，Tianjin University，Tianjin 300072，China\r
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Abstract_Chinese:\r为了更好地理解单液滴撞击不同物性流体湿壁面现象，采用激光诱导荧光(laser induced fluorescence，LIF)方法研究了不同入射液滴韦伯数、无量纲液膜厚度及液膜黏度对撞壁现象的影响规律．研究表明，液滴撞击后液膜可分为稳定冠状、飞溅冠状和剧烈飞溅冠状3 种形态，入射液滴韦伯数越大，液膜形态变化越剧烈．相同液膜黏度和无量纲液膜厚度下，无量纲冠顶高度随入射液滴韦伯数的增大而升高，且韦伯数越大，到达冠状顶点所需时间越长，冠状维持时间越久．保持入射液滴韦伯数和无量纲液膜厚度不变，随液膜黏度升高，无量纲冠顶高度降低，且到达冠状顶点的时间提前，冠状维持时间缩短；保持入射液滴韦伯数和液膜黏度不变，随无量纲液膜厚度增加，无量纲冠顶高度先升高后降低，但冠状达到顶点的时间以及冠状维持时间均持续增加．相同无量纲液膜厚度和液膜黏度下，无量纲冠顶直径随入射液滴韦伯数的增大而增大．保持入射液滴韦伯数和无量纲液膜厚度不变，无量纲冠顶直径随液膜黏度升高而降低；保持入射液滴韦伯数和液膜黏度不变，无量纲冠顶直径随无量纲液膜厚度的增大而降低．根据试验数据拟合出了冠状形态的临界韦伯数与无量纲液膜厚度的关系式，以及无量纲冠顶高度和冠顶直径与入射液滴韦伯数的关系式．\r
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Abstract_English:\rIn this study，laser-induced fluorescence(LIF)test was used for determining the impingement behavior of single droplet impact on liquid film with different physical properties. The effect of incident droplet Weber number，dimensionless liquid film thickness，and liquid film viscosity on the morphology of liquid film after impact was investigated. After the droplet impact，the liquid film can be divided into three states：Stable crown，splashed crown，and fast splashed crown. The larger the Weber number of the incident droplets，the easier the liquid film will be splashed and the more severely the morphology will change. Under the same liquid film viscosity and dimensionless liquid film thickness，the dimensionless crown height increases with increasing Weber number of the incident droplets. When the Weber number is larger，the time required to reach the crown summit will be longer and the crown maintenance time will expand. When keeping the Weber number of the incident droplet and the dimensionless liquid film thickness constant，the dimensionless crown height decreases，the time to reach the crown apex is advanced，and the crown maintenance time is shortened with increasing viscosity of the liquid film. Under the same Weber number and liquid film viscosity，the dimensionless crown height increases first and then decreases with increasing dimensionless liquid film thickness. However，the time to reach the crown vertex and the crown maintenance time continuously increase. Under the same dimensionless liquid film thickness and liquid film viscosity，the dimensionless crown diameter increases with increasing Weber number of the incident droplet. When keeping the Weber number of the incident droplet and the dimensionless liquid film thickness unchanged，the dimensionless crown diameter decreases with increasing viscosity of the liquid film. Under the same Weber number and liquid film viscosity，the dimensionless
crown diameter decreases with increasing dimensionless oil film thickness. The experimental data were used to fit the relation between the critical Weber number and the dimensionless liquid film thickness and among the dimensionless crown height，the diameter，and the Weber number.\r
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Keyword_Chinese:单液滴撞壁；液膜冠状形态；临界韦伯数；无量纲冠状参数\r

Keywords_English:single droplet impact；liquid film crown；critical Weber number；dimensionless crown parameters\r


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