串列三圆球绕流数值模拟  

Numerical simulation for flow past three spheres in tandem arrangement

作　　者：韩守磊[1] 曾卓雄[1] 徐义华[1] 

机构地区：[1]南昌航空大学航空与机械工程学院,南昌330063

出　　处：《水动力学研究与进展（A辑）》2008年第2期175-180,共6页Chinese Journal of Hydrodynamics

摘　　要：为了研究不同间距对串列放置的三圆球尾涡和湍动能的影响,本文选取在L=2.0D～4.0D(L为相邻球心之间的距离,D为圆球直径)范围内的5个不同间距进行了数值模拟,计算均在圆球Rep≈1000的条件下进行。结果表明:当L≤2.5D时,由于逆压梯度的影响,在第二个圆球滞止点附近捕捉到附体分离泡;由于第二个与第三个圆球的置入,展向压力梯度诱发第一个圆球背风面流动的展向输运,且随着圆球间距的增加流场的展向输运趋势减小,但涡的强度增大;第二个圆球与第三个圆球背风面流动没有明显的展向输运;湍动能的增量与圆球间距近似成平方规律。In order to study the effect of different gaps on the wake and turbulent kinetic energy of three spheres in tandem arrangement, numerical simulations of steady flow field on five cases between L=2.0D and 4.0D （L the distance of the center of spheres, D the diameter of a sphere） are performed at Rep≈1000. The results show that a separate dunk is observed near the stagnation point of the second sphere on the distance of spheres L〈2.5D because of the influence of reverse pressure gradient.The spanwise pressure gradient induces the spanwise fluid flow of the first sphere because of the presence of the second and the third sphere, and decreases with the increase of the distance of sphere, but the intensity of vortex is augmented because of the reverse velocity of spanwise. The spanwise fluid flow of the second and the third sphere is hardly emerged. The magnitude of turbulence enhancement decreases with the increase of sphere distance roughly in a square law.

关 键 词：三圆球 回流涡 数值模拟 湍动能 

分 类 号：O35[理学—流体力学]