Investigation of wall normal electromagnetic actuator for seawater flow control
Investigation of wall normal electromagnetic actuator for seawater flow control
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DOI：
10.1088/1468-5248/3/1/005
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发表时间：
2002-01
影响因子：
1.9
通讯作者：
L. Rossi;J. Thibault
中科院分区：
文献类型：
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作者：
L. Rossi;J. Thibault
电磁(EM)流动控制处理的概念是结合使用“壁面冲洗”电极(j，直流电源)和“亚表面”磁铁(B，磁感应起始点)，在海水边界层内直接产生局部体力(j×B)。本文对电磁流量控制进行了分析、实验和计算研究。这项工作旨在提供对湍流强度和壁面阻力减小以及相干结构消光所涉及的基本机制的理解。首先，介绍了电磁执行器及其工作模式。这一描述包括对电磁致动器的一些一般性评论，适用于海水中电磁控制的一组方程，以及根据可能的作用机制分析的无量纲参数的选择。其次，给出了电磁激励下壁面边界流动的实验研究和可视化结果：执行器周围的近壁涡、执行器上方的吸力区和边界层。
Electromagnetic (EM) flow control deals with the concept of using in combination ‘wall-flush’ electrodes ( j , dc current supply) and ‘sub-surface’ magnets ( B , magnetic induction origin) to create directly local body forces ( j × B ) within a seawater boundary layer. Analytical, experimental and computational investigations of EM flow control are presented here. This work is intended to provide understanding of the basic mechanisms involved in turbulence intensity and skin friction reductions as well as in coherent structure extinction. First, the EM actuator and its modes of action are described. This description includes some general remarks on the EM actuator, the set of equations suitable for EM control in seawater and a selection of dimensionless parameters analysed in terms of possible mechanisms of action. Second, some experimental investigations and visualizations of wall-bounded flows under EM actuation are presented: the near-wall vortex around the actuator; the suction zone above the actuat...