电磁力控制振动圆柱的实验研究

he Lorentz forces generated by electromagnetic fields on the surface of the cylinder in the electrolyte solution may modify the structures of the flow boundary layer effectively. In this paper, the transient control process of Lorentz forces is investigated experimentally which aims for the lift amplification and vibration suppression. Experiments are conducted in a rotating annular tank filled with a low-conducting electrolyte. A cylinder with an electro-magnetic actuator mounted on the surface is placed into the electrolyte. Force measurements have been carried out by strain gages attached to a fixed beam to which the cylinder is suspended and flow fields are visualized by dye markers. The results show that the upper vortex of cylinder is suppressed and the wake becomes a line leaning to the lower side with the application of upside Lorentz force while the lower vortex of cylinder is suppressed and limited in a small region. Therefore, the value of lift increases with the variations of flow field. However, the vortexes of cylinder are suppressed fully with the application of symmetrical Lorentz force which leads to the suppression of lift oscillatory and then the vibration of cylinder are suppressed fully.