Electromagnetic control of the instability in the liquid metal flow over a backward-facing step

doi:10.1088/1674-1056/ac989d

中国物理B ›› 2022, Vol. 31 ›› Issue (12): 124701-124701.doi: 10.1088/1674-1056/ac989d

Electromagnetic control of the instability in the liquid metal flow over a backward-facing step

Ya-Dong Huang(黄亚冬)^1,2, Jia-Wei Fu(付佳维)², and Long-Miao Chen(陈龙淼)^2,†

1 Jiangsu University, Zhenjiang 212013, China;
2 Nanjing University of Science and Technology, Nanjing 210094, China

收稿日期:2022-07-01 修回日期:2022-09-25 接受日期:2022-10-10 出版日期:2022-11-11 发布日期:2022-11-21
通讯作者: Long-Miao Chen E-mail:chenlongmiao@njust.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. U2141246).

Electromagnetic control of the instability in the liquid metal flow over a backward-facing step

Ya-Dong Huang(黄亚冬)^1,2, Jia-Wei Fu(付佳维)², and Long-Miao Chen(陈龙淼)^2,†

1 Jiangsu University, Zhenjiang 212013, China;
2 Nanjing University of Science and Technology, Nanjing 210094, China

Received:2022-07-01 Revised:2022-09-25 Accepted:2022-10-10 Online:2022-11-11 Published:2022-11-21
Contact: Long-Miao Chen E-mail:chenlongmiao@njust.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. U2141246).

摘要/Abstract

摘要： The tile-type electromagnetic actuator (TEA) and stripe-type electromagnetic actuator (SEA) are applied to the active control of the perturbation energy in the liquid metal flow over a backward-facing step (BFS). Three control strategies consisting of base flow control (BFC), linear model control (LMC) and combined model control (CMC) are considered to change the amplification rate of the perturbation energy. CMC is the combination of BFC and LMC. SEA is utilized in BFC to produce the streamwise Lorentz force thus adjusting the amplification rate via modifying the flow structures, and the magnitude of the maximum amplification rate could reach to 6 orders. TEA is used in LMC to reduce the magnitude of the amplification rate via the wall-normalwise Lorentz force, and the magnitude could be decreased by 2 orders. Both TEA and SEA are employed in CMC where the magnitude of the amplification rate could be diminished by 3 orders. In other words, the control strategy of CMC could capably alter the flow instability of the liquid metal flow.

关键词: electromagnetic actuator, backward-facing step flow, flow instability, flow control

Abstract: The tile-type electromagnetic actuator (TEA) and stripe-type electromagnetic actuator (SEA) are applied to the active control of the perturbation energy in the liquid metal flow over a backward-facing step (BFS). Three control strategies consisting of base flow control (BFC), linear model control (LMC) and combined model control (CMC) are considered to change the amplification rate of the perturbation energy. CMC is the combination of BFC and LMC. SEA is utilized in BFC to produce the streamwise Lorentz force thus adjusting the amplification rate via modifying the flow structures, and the magnitude of the maximum amplification rate could reach to 6 orders. TEA is used in LMC to reduce the magnitude of the amplification rate via the wall-normalwise Lorentz force, and the magnitude could be decreased by 2 orders. Both TEA and SEA are employed in CMC where the magnitude of the amplification rate could be diminished by 3 orders. In other words, the control strategy of CMC could capably alter the flow instability of the liquid metal flow.

Key words: electromagnetic actuator, backward-facing step flow, flow instability, flow control

中图分类号: (Flow instabilities)

47.20.-k

47.85.L- (Flow control)

Ya-Dong Huang(黄亚冬), Jia-Wei Fu(付佳维), and Long-Miao Chen(陈龙淼). Electromagnetic control of the instability in the liquid metal flow over a backward-facing step[J]. 中国物理B, 2022, 31(12): 124701-124701.

Ya-Dong Huang(黄亚冬), Jia-Wei Fu(付佳维), and Long-Miao Chen(陈龙淼). Electromagnetic control of the instability in the liquid metal flow over a backward-facing step[J]. Chin. Phys. B, 2022, 31(12): 124701-124701.

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Electromagnetic control of the instability in the liquid metal flow over a backward-facing step

Electromagnetic control of the instability in the liquid metal flow over a backward-facing step

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