基于平行双板结构的圆管尾流抑制方法研究  

Flow control method for wake suppression of circular pipes based on parellel dual plates

作　　者：孙冰 李金宣[2] 包艳[3] 

机构地区：[1]山东省交通规划设计院,山东济南250031 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116023 [3]帝国理工学院航空工程系

出　　处：《海洋工程》2015年第3期100-106,共7页The Ocean Engineering

摘　　要：通过数值模拟方法对基于平行双板的圆管尾流进行抑制研究。以二维不可压缩粘性流体方程为流动控制方程,并采用稳定化流体有限元方法求解。基于数值结果,详细探讨了平行双板的安装角度和板长等关键特征参数对尾流的抑制作用和影响。数值分析发现,平行双板结构对尾流的抑制作用明显优于传统单板控制。计算结果显示,基于平行双分隔板的尾流抑制最优位置为从圆管后驻点起向上游40°-50°处,并且与单板相比,在更短板长条件下,亦可完全抑制圆管的旋涡脱落,从而尾流从非定常涡旋流转入定常流动。当安装位置为θ≥80°时,被控圆管表面压力分布与无控圆管类似,说明此时平行双板控制无减阻效应。最后,基于数值模拟结果,对本方法的尾流高效控制效应,给出了相应的流动机制。In this paper, we numerically investigated wake suppression of the flow behind circular pipes by using parallel splitter plates. A stabilized finite element method is used for the solution of the two-dimensional Navier-Stokes incompressible equations governing the separated flows over the pipe-like structures. The effects of fixing angle and plate length on the bluff body wake are discussed in detail. The numerical results show that the control efficiency of the current method could be significantly improved when compared with the traditional single splitter-based method. The wake instability can be completely suppressed for the relatively shorter plate length and the optimal position angle of the parallel plates is approximately between 40° -50° from the rear base point of the circular pipe. When the fixing angle is larger than 80°, the pressure distribution along the surface of controlled cylinder looks very similar to that of the uncontrolled case, showing the dual plate control no longer works for drag reduction effect. Finally, the flow mechanisms in relation to the wake control of the developed strategy are given based on the numerical analysis.

关 键 词：平行双板 圆管 旋涡脱落 分隔板 尾流抑制 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]