We report an experimental study about the control of the turbulent wake of a square cylinder. The control device consists in a couple of compliant flaps implemented on the sides of the square cylinder. Both flaps are hinged so that they can freely rotate around their leading edge. Particular emphasis is given to the analysis of the wake through the investigation of both mean and turbulent velocity fields. The contribution to drag reduction of each of these physical parameters is evaluated from experimental data. The main conclusions are twofold: i. the control essentially modifies the turbulent velocity field leading to a reduction of the lateral flow entrainment, ii. this change is due to the synchronization of the vortex shedding on each side of the square cylinder.

我们报告了一项关于方形圆柱体湍流尾流控制的实验研究。控制装置由安装在方形圆柱体侧面的几个顺应襟翼组成。两个襟翼均通过铰链连接，以便可以绕其前缘自由旋转。特别强调通过研究平均速度场和湍流速度场来分析尾流。这些物理参数对减阻的贡献是根据实验数据进行评估的。主要结论有两个：该控制本质上改变了湍流速度场，导致侧流夹带减少，ii．这种变化是由于方圆柱体每一侧的涡旋脱落是同步的。