摘要详情
680 / 2022-03-31 14:51:00
Behavior Analysis of Bubble Migration under Coupling of Liquid Nitrogen Velocity and Electric Field
Low temperature composite insulation,气泡,液氮
终稿
Purpose/Aim
Composite insulation of high temperature superconducting (HTS) cable is prone to flashover caused by bubble aggregation at interface, which affects insulation performance. It is of great significance to study the migration and movement of bubbles in liquid nitrogen to maintain the stable operation of superconducting cables.
Experimental/Modeling methods
In order to understand the influence of bubble movement and migration behavior on electric field distortion in liquid nitrogen, the gas-liquid two-phase flow model was established by COMSOL software. The change law of bubble shape and trajectory under the coupling effect of liquid nitrogen and electric field was studied by simulation analysis. The change law of bubble shape under different flow rates and the movement law of bubbles under different bubble radius were analyzed.
Results/discussion
The results show that the bubble shape can stretch horizontally and vertically in the process of rising and shifting, and change regularly in a certain range. With the change of flow velocity, deformation rate of bubbles increases and liquid nitrogen region in the vertical direction of bubbles is easier to be broken down. The vibration equilibrium position of bubbles with different sizes is relatively close.
Conclusions
Movement of bubbles in the pipeline can be divided into two stages: One is the rising stage, and the other is the horizontal moving to the right stage. The electric field stretches the bubble, and its direction is perpendicular to the electric field line.
With the increase of liquid nitrogen flow rate, deformation rate of bubbles increases, and the stretching of bubbles is more obvious. Liquid nitrogen in the direction perpendicular to the bubble is easier to be broken down, which affects the insulation performance. The smaller the bubble is, the faster the velocity changes. After a period of time, the speed tends to be stable, and the equilibrium position is closer.
Composite insulation of high temperature superconducting (HTS) cable is prone to flashover caused by bubble aggregation at interface, which affects insulation performance. It is of great significance to study the migration and movement of bubbles in liquid nitrogen to maintain the stable operation of superconducting cables.
Experimental/Modeling methods
In order to understand the influence of bubble movement and migration behavior on electric field distortion in liquid nitrogen, the gas-liquid two-phase flow model was established by COMSOL software. The change law of bubble shape and trajectory under the coupling effect of liquid nitrogen and electric field was studied by simulation analysis. The change law of bubble shape under different flow rates and the movement law of bubbles under different bubble radius were analyzed.
Results/discussion
The results show that the bubble shape can stretch horizontally and vertically in the process of rising and shifting, and change regularly in a certain range. With the change of flow velocity, deformation rate of bubbles increases and liquid nitrogen region in the vertical direction of bubbles is easier to be broken down. The vibration equilibrium position of bubbles with different sizes is relatively close.
Conclusions
Movement of bubbles in the pipeline can be divided into two stages: One is the rising stage, and the other is the horizontal moving to the right stage. The electric field stretches the bubble, and its direction is perpendicular to the electric field line.
With the increase of liquid nitrogen flow rate, deformation rate of bubbles increases, and the stretching of bubbles is more obvious. Liquid nitrogen in the direction perpendicular to the bubble is easier to be broken down, which affects the insulation performance. The smaller the bubble is, the faster the velocity changes. After a period of time, the speed tends to be stable, and the equilibrium position is closer.
重要日期
-
会议日期
09月25日
2022
至09月29日
2022
-
08月15日 2022
提前注册日期
-
09月10日 2022
报告提交截止日期
-
11月10日 2022
注册截止日期
-
11月30日 2022
初稿截稿日期
-
11月30日 2022
终稿截稿日期
主办单位
IEEE DEIS
承办单位
Chongqing University
联系方式
- Zhengyong Huang
- 61******@qq.com
历届会议
-
2020年09月06日 中国 Beijing
2020 IEEE International Conference on High Voltage Engineering and Application -
2018年09月10日 希腊
2018 IEEE International Conference on High Voltage Engineering and Application -
2016年09月19日 中国 Chengdu, China
2016 IEEE International Conference on High Voltage Engineering and Application
