电磁流体表面推进流场结构特征的数值研究  

Numerical Investigation on Flow Field Structure Characteristics for Electromagnetic Propulsion by Surface

作　　者：刘宗凯[1] 周本谋[1] 刘会星[1] 黄翼飞[1] 刘志刚[1] 

机构地区：[1]南京理工大学瞬态物理重点实验室,江苏南京210094

出　　处：《河北大学学报（自然科学版）》2010年第5期454-458,480,共6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(XKF09085);国家自然科学基金资助项目(10572061)

摘　　要：数值研究了弱导电流体中,具有不同电磁极条带宽度的推进单元近壁电磁力的分布特征和对流场结构的调控效果,并比较分析了不同结构的推进单元体对周围流场推进效果间的差异.采用有限体积法对流场的基本控制方程(Navier-Stokes equation)进行求解.数值结果表明,不同电磁极宽度的推进单元所激发的电磁场场强和流体边界层中电磁力的分布具有类似的变化趋势,但电磁力的渗透深度有差异.电磁极条带较宽的推进单元,其附近电磁体积力具有较好的渗透效果,但其近壁场强较弱.推进单元绕流流场的数值模拟揭示了场强的渗透较深时对推进单元周围流场的影响更加显著.流向电磁力使得边界层流向动能增加,涡量场结构发生改变.推进单元上下表面涡量值出现了正负更替分布的变化特点.Numerical investigations on the distribution characteristics of the near-wall electromagnetic force and the electromagnetic force control effects in weakly conductive fluid have been simulated,in the cases of the electromagnetic propulsion units with three different electromagnetic pole widths.The different action effects of propulsion units in different structures were compared and analyzed.The basical governing equations of flow field（Navier-Stokes equation） were solved by means of finite volume simulation method.Numerical experimental results showed that the distributions of electromagnetic field strength and electromagnetic force in fluid boundry layer in different electromagnetic pole widths had similar tendency but different in the penetration depth of the electromagnetic force.The widest appeared better penetration effects but weak near-wall electromagnetic force strength than others.The numerical simulation of flow field indicated that the penetration depth of field strength played an important role in influencing the flow fluid around the propulsion units.The results also showed that streamwise electromagnetic force not only could increase streamwise kinetic energy of boundary layer but also could change the structure of vorticity field.On each side of the propulsion units＇ surfaces,a particular change was observed that vorticity changed from negative to positive alternately.

关 键 词：电磁推进单元 电磁体积力 电磁极宽度 

分 类 号：O35[理学—流体力学] TM15[理学—力学]