摘要
将电磁激活板包覆于舵面体表面并置于流动的弱电介质溶液中(如海水),通过产生的电磁力对舵面体表面的流体边界层结构进行控制.基于近壁湍流的拟序结构理论,分析了在湍流状态下展向电磁力的方向、强度、脉动方式与作用频率对湍流减阻的控制作用效果.研究结果发现,一定强度和间歇频率的展向电磁力能够有效地减小湍流状态下的舵面体所受到的流体阻力,表明湍流边界层上的展向电磁力能够影响控制舵面的湍流流体动力学特性.
Experiments concerning turbulent flow around rudder controlled by spanwise electromagnetic force（i.e.Lorentz force） with different distribution were conducted.The rudder was surface-mounted with an actuator with spanwise-aligned electrodes and magnets interlaced with each other,and immerged into low-conducting electrolyte,such as seawater.The coherent structure in the turbulent boundary layer might be modified or disturbed by spanwise Lorentz force.The control effects on the turbulent skin friction were measured using a direct measurement of drag.It was found that the turbulent shear stress could be reduced significantly by spanwise Lorentz force.Comparing with continuous Lorentz force,more drag reduction could be achieved by spanwise oscillating Lorentz force.By analyzing turbulent coherent structure,the mechanism of turbulent drag reduction by spanwise oscillating Lorentz force was discussed.
出处
《河北大学学报（自然科学版）》
CAS
北大核心
2010年第5期485-489,共5页
Journal of Hebei University(Natural Science Edition)
基金
南京理工大学科技发展基金资助项目(XKF09058)
国家自然科学基金资助项目(10572061)
关键词
舵面绕流
展向电磁力
湍流减阻
拟序结构
flow around rudder
spanwise Lorentz forces
turbulent drag reduction
coherent structure
