【作者】 周本谋； 范宝春； 陈志华； 李鸿志；

【Author】 ZHOU Ben-mou FAN Bao-chun CHEN Zhi-hua LI Hong-zhi (National key laboratory of transient physics,NUST,Nanjing,Jiangsu 210094,China)

【机构】 南京理工大学瞬态物理国家重点实验室；

【摘要】 利用流体边界层上的电磁体积力控制流体边界层的周期性脱落与分离,限制尾流涡街的产生,从而实现消除涡流和减少涡生震动的目的.理论分析和实验研究表明,当圆柱表面包覆的电磁场作用参数N>1,包覆磁场强度B≥0.5T,流体边界层表面电流密度j 为10~3 A/m~2数量级时,对于一般情况下的流场参数而言,流体边界层上的电磁体积力具有十分良好的消涡与减震控制作用效果.优化圆柱体表面的电磁场包覆范围,可以提高电磁消涡减震控制效率.当流体边界层上的电磁体积力方向与流体边界层的流动方向相反时,电磁力又具有显著的增涡增震控制作用效果.更多还原

【Abstract】 Introducing electromagnetic body forces localized around at the flow boundary layers forcontrolling the flow boundary layer separation and shell off from the blunt body surface periodically,for restricting the wake street,for suppressing the vortex stream and absorption of the vortex inducedvibration,have been conducted.It have been indicated by theoretical analysis and experimental studythat the controlling effects of the electromagnetic body forces have been remarkable as the actionparameter of the electromagnetic field(N)equaling to 1,the magnetic flux density(B)approaching to0.5T,and the electric current density(j)near around the flow boundary layer up to 10~3 A/m~2 scalar forgeneral flow conditions.By optimizing the area of the electromagnetic fields flush mounted around thesurface of the cylinder,the controlling effects of electromagnetic vortex suppression and vortexinduced vibration absorption may have been improved.While the electromagnetic force directedopposed to the mean flow of the flow boundary layer,the obvious vortex acceleration and vibrationamplify may have been presented.更多还原