The control performance of a streamwise-oriented dielectric barrier discharge (DBD) plasma actuator, a set of plasma streamwise vortex generators (PSVGs), and a hybrid actuator of the plasma actuator and PSVGs on the reduction in bluff body flow separation, vortex-induced vibration (VIV), and wake fluctuation is experimentally investigated. Experiments are conducted in a low-speed and low-turbulence wind tunnel with a Reynolds number between 3 $\times$ $10^3$ and 1.2 $\times$ $10^4$ based on the diameter of a half circular cylinder. Particle image velocimetry (PIV) is used to obtain details on the flow fields over a short D-shaped bluff body. Force measurement is conducted to compare the reduction in drag and vibration oscillations using these three types of plasma actuators. The PIV flow fields show that all of the plasma actuators suppress the flow separation on the bluff body, narrow the size of the wake, and decrease the turbulence kinetic energy (TKE) level in the wake. This stable controlled vortex shedding system can reduce the effect of the natural frequency of the bending stiffness-dominated cylinder structure system, thus avoiding the occurrence of resonance in advance. The reduction in drag and lateral lift oscillation are studied by mapping the changes in force coefficients and fluctuations as a function of Reynolds number. A comparison of these plasma actuators shows that the hybrid actuator achieves best drag reduction, suppression of lift oscillation, and Kármán vortex shedding in the wake at low speed, because three-dimensional flow structures are generated on the surface of the bluff body that consequently enhance the mixing. The results suggest that PSVGs and ameliorative actuators are promising for wake flow control in bluff bodies at low speeds.

流向介电势垒放电（DBD）等离子体致动器，一组等离子体流向涡流发生器（PSVG）以及等离子体致动器和PSVG的混合致动器对减少涡流引起的钝体流分离的控制性能振动（VIV）和尾波波动的实验研究。实验是在雷诺数为3的低速低湍流风洞中进行的$\times$ $\mathrm{1个}{0}^3$ 和1.2 $\times$ $\mathrm{1个}{0}^4$根据半圆柱的直径。粒子图像测速（PIV）用于获得短D​​形钝体上流场的详细信息。使用这三种类型的等离子致动器进行力测量以比较阻力和振动振荡的减少。PIV流场表明，所有等离子致动器都可以抑制钝体上的流分离，缩小尾流的大小，并降低尾流中的湍流动能（TKE）水平。这种稳定的受控涡旋脱落系统可以减小弯曲刚度主导的圆柱结构系统的固有频率的影响，从而避免提前发生共振。通过将力系数和波动的变化映射为雷诺数的函数来研究阻力和侧向提升振动的减少。对这些等离子作动器的比较表明，混合动力作动器在低速时实现了最佳的减阻，升力振荡的抑制以及卡曼涡流在低速时的脱落，因为在阻流体的表面上产生了三维流动结构，从而增强了流动性。混合。结果表明，PSVG和改进型执行器有望在低速情况下控制钝体中的尾流。因为在阻流体的表面上产生了三维流动结构，从而增强了混合。结果表明，PSVG和改进型执行器有望在低速情况下控制钝体中的尾流。因为在阻流体的表面上产生了三维流动结构，从而增强了混合。结果表明，PSVG和改进型执行器有望在低速情况下控制钝体中的尾流。