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Drag reduction of a 3D bluff body using plasma actuators

机译:使用等离子执行器减少3D钝器的阻力

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The aim of this study is to reduce the drag of a simplified car geometry using surface dielectric barrier discharge actuators. Experiments were conducted in a wind tunnel for a low Reynolds number (6.7.10~5) with the Ahmed body reference (rear slant angle of 25°, zero yaw angle). The effect of steady and unsteady actuation on the flow topology was investigated carrying out 2C-PIV and 1D hot wire measurements. The efficiency of the actuators was characterised by stationary balance measurements. Drag reductions up to 8% were obtained by suppressing the separation bubble above the rear window. The results suggest that plasma actuators are simple to implement on a model and can provide useful information for automotive aerodynamics through parametric studies with parameters relevant for flow control (position, surface, frequency and duty cycle of the pulsed actuation).
机译:这项研究的目的是使用表面介质阻挡放电致动器来减少简化的汽车几何形状的阻力。在风洞中进行了低雷诺数(6.7.10〜5)的实验,并采用了Ahmed车身参考(后倾斜角为25°,偏航角为零)。进行2C-PIV和1D热线测量时,研究了稳定和不稳定驱动对流动拓扑的影响。执行器的效率通过静态平衡测量来表征。通过抑制后窗上方的分离气泡,可将阻力降低多达8%。结果表明,等离子体致动器易于在模型上实现,并且可以通过参数研究提供与流量控制相关的参数(脉冲致动的位置,表面,频率和占空比),从而为汽车空气动力学提供有用的信息。

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