液-液斜界面R-T失稳特征的实验研究

江荣宝; 黄熙龙; 邹立勇; 施红辉; 吴鋆

doi:10.11858/gywlxb.20180512

液-液斜界面R-T失稳特征的实验研究

doi: 10.11858/gywlxb.20180512

江荣宝^1,,
黄熙龙^2,*, ,,
邹立勇²,
施红辉¹,
吴鋆²

1.
浙江理工大学机械与自动控制学院, 浙江杭州 310000
2.
中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室, 四川绵阳 621999

基金项目:

国家自然科学基金 11472253

国家自然科学基金 11672277

国家自然科学基金 11602247

科学挑战专题 TZ2016001

详细信息

作者简介:
江荣宝(1993—), 男, 硕士研究生, 主要从事界面不稳定性的实验研究. E-mail: 18367053723@163.com

通讯作者:
黄熙龙(1988—), 男, 硕士, 助理研究员, 主演从事界面不稳定性研究. E-mail: xlhuang@caep.cn

中图分类号: O357.5
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出版历程
- 收稿日期: 2018-01-31
- 修回日期: 2018-03-28

Experimental Investigation on the Characteristics of Unstability at Liquid-Liquid Tilted Interface Induced by Rayleigh-Taylor Instability

1.
Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou 310000, China
2.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Physics, CAEP, Mianyang 621999, China

摘要

摘要: 实验研究了不同加速度下不相溶流体斜界面Rayleigh-Taylor（R-T）不稳定性诱导湍流混合区的发展特征。利用高速阴影测试技术研究了硅油/碘化钾溶液界面R-T不稳定性诱导界面的演化规律，定量分析了混合区发展宽度、界面倾角与时间的关系。通过实验结果分析得出：水平界面与斜界面混合区宽度演化的差别主要体现在后期，前、中期两者演化规律基本一致；界面倾角的演化呈现出两种不同的趋势，随时间先呈抛物线增长，随后线性增长，演化后期流体界面发生翻转；由R-T不稳定性诱导的界面混合与K-H不稳定性诱导的界面混合呈相互竞争的关系。
- Rayleigh-Taylor不稳定性 /
- 湍流混合 /
- 阴影法 /
- 斜界面
Abstract: In this research, we experimentally investigated the characteristics of the turbulent mixing zone induced by Rayleigh-Taylor (R-T) instability under different accelerations.We used the high-speed shadowgraph to study the evolution of the interface composed with the silicone oil/potassium iodide solution, and analyzed the width of the mixing zone and the obliquity of the interface quantitatively.According to the experimental results, the difference in the evolution of width between horizontal interface and oblique interface exhibits mainly in late stage, and the evolution law is basically same with that in the early and middle stages.There are two different trends in the evolution of the interfacial obliquity.The interfacial obliquity increases with time parabolicaly at first, and then increases linearly.As a result, the fluid interface turns over in the later stage of evolution.There is a competitive relationship between the turbulent mixing induced by R-T instability and K-H instability respectively.
- Rayleigh-Taylor instability /
- turbulent mixing /
- shadowgraph method /
- titled interface

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图 1 实验装置示意

Figure 1. Schematic of experimental apparatus

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图 2 阴影法示意

Figure 2. Schematic of shadowgraph

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图 3 加速度曲线

Figure 3. Acceleration curves

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图 4 高压段初始压力为0.25 MPa时界面湍流混合区发展阴影图

Figure 4. Evolution of turbulent mixing zone when the initial pressure of the high pressure section is 0.25 MPa

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图 5 界面加速度分解

Figure 5. Acceleration decomposed at the interface

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图 6 高压段初始压力为0.40 MPa时界面湍流混合发展阴影图

Figure 6. Evolution of turbulent mixing zone when the initial pressure of the high pressure section is 0.40 MPa

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图 7 斜界面混合区参数定义

Figure 7. Parameter definiton of mixing zonein obilique interface

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图 8 混合区宽度W随时间的演化

Figure 8. Evolution of width of turbulentmixing zone over time

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图 9 界面倾角γ随时间的演化

Figure 9. Evolution of obliquity of turbulentmixing zone over time

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表 1 实验参数

Table 1. Experimental parameters

Case	Atwood number	Initial interfacial thickness/mm	γ₀/(°)	Initial pressure at high pressure section/MPa
1	0.169	0.721	0	0.25
2	0.169	0.752	5	0.25
3	0.169	0.734	0	0.40
4	0.169	0.761	5	0.40

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