液滴高速撞击低温壁面的动态特性及破碎机理研究

雷基林; 李建微; 刘懿; 苟瑶; 刘阳; 邓晰文

doi:10.11729/syltlx20210066

液滴高速撞击低温壁面的动态特性及破碎机理研究

doi: 10.11729/syltlx20210066

昆明理工大学云南省内燃机重点实验室，昆明　650500

基金项目: 云南省产业技术领军人才培育项目（YLXL20170076）

详细信息

作者简介:
雷基林：（1977-），男，汉族，四川广安人，博士，教授。研究方向：流体流动与传热，结构设计与优化。通信地址：云南省昆明市呈贡区吴家营街道景明南路727号昆明理工大学交通工程学院C座（650500）。E-mail：leijilin@kust.edu.cn

通讯作者:
E-mail：lqyi@kust.edu.cn

中图分类号: TQ028.8
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- 文章访问数: 485
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-29
- 修回日期: 2021-08-18
- 录用日期: 2021-08-27
- 网络出版日期: 2021-09-03
- 刊出日期: 2022-10-01

Experimental study on spreading and breaking mechanism of droplet impinging on low temperature wall at high speed

Yunnan Province Key Laboratory of Internal Combustion Engine, Kunming university of science and technology, Kunming　650500, China

摘要

摘要: 为研究液滴撞击低温壁面的动态行为，运用高速阴影法对韦伯数（We）在533～1630之间的单液滴撞击常温壁面（22 ℃）与低温壁面（−30～−10 ℃）进行可视化试验。试验结果表明：液滴以一定速度撞击低温壁面时，会发生即时破碎和冠状破碎，二次液滴飞溅明显；但液滴以相同速度撞击常温壁面时，未出现液滴破碎现象。随着壁面温度的降低，液滴撞壁破碎所需韦伯数减小。在壁面温度为−30 ℃时，液滴撞击铝合金板的破碎临界韦伯数降低至480左右；当We < 480时，即使壁面温度低于−30 ℃，液滴也不会发生撞壁破碎。当液滴撞击常温壁面时，液滴快速铺展，并且韦伯数越大，液滴铺展和回缩的速度越大，液滴的铺展因子越大。该研究可为液滴撞击低温壁面撞壁模型的建立提供参考。
- 液滴撞壁 /
- 低温壁面 /
- 铺展因子 /
- 撞壁破碎 /
- 高速阴影法
Abstract: In order to study the dynamic behavior of a droplet impinging on a low-temperature wall, a visualization test was carried out on a single droplet impinging on the normal temperature （22 ℃） and low temperature wall （−30 – −10 ℃） with the Weber number between 533 and 1630 by the high speed shadowing method. The experimental results show that prompt splash and corona splash occurs when the droplet impinges on the low temperature wall at the certain speed, and the splashing of secondary droplet is obvious. However, when the droplet impinges on the normal temperature wall at the same speed, there is no droplet breakage phenomenon. With the decrease of the wall temperature, the Weber number required for the droplets to smash into the wall decreases. When the wall temperature is −30 ℃, the critical Weber number of the droplet crashing into the aluminum plate decreases to about 480. When We < 480, even if the wall temperature is lower than −30 ℃, the droplets would not smash into the wall. When the droplet hits the normal temperature wall, the droplet spreads out rapidly, and the larger the Weber number is, the greater the spread and retraction speed of the droplet is, and the larger the spreading factor of the droplet is. This study provides a reference for the establishment of the impingement model of the droplet impinging on the low temperature wall surface.
- droplet hit wall /
- low temperature wall /
- spreading factor /
- splashing /
- high speed shadowing method

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图 1 试验系统

Figure 1. Experimental system

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图 2 液滴铺展及破碎过程

Figure 2. Droplet spreading and breaking process

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图 3 液滴撞击铝合金板的破碎和不破碎临界分布

Figure 3. The critical distribution of droplet breaking and unbreaking when hitting aluminum plate

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图 4 液滴撞击亚克力板的破碎和不破碎临界分布

Figure 4. The critical distribution of droplet breaking and unbreaking when hitting PMMA plate

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图 5 液滴的反弹与冻结

Figure 5. Droplet rebound and freezing

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图 6 不同撞壁速度对液滴铺展的影响

Figure 6. Influence of different impingement velocities on droplet spreading

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图 7 不同壁面材料对液滴撞壁铺展的影响

Figure 7. Influence of different wall materials on droplet spreading by impinging on the wall

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图 8 不同壁面温度对液滴撞壁铺展因子的影响

Figure 8. Influence of different wall temperature on droplet spreading by impinging on the wall

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表 1 试验用板属性

Table 1. Test board properties

名称	材质	λ/（W·m⁻¹·K⁻¹）	规格/mm³	Ra/μm
铝合金板	1050	224.00	100 × 100 × 1	0.025
不锈钢板	304	16.20	100 × 100 × 1	0.011
亚克力板	PMMA	0.19	100 × 100 × 2	0.008

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表 2 试验工况

Table 2. Experimental conditions

D/mm	v/（m·s⁻¹）	T/℃
2.6 ± 0.1	6.75，5.21，3.86	22，−10，−20，−30

下载: 导出CSV

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