Periodic-forcing jets are applied to form a zero-net-mass-flux actuator for active flow control study on the \(25^{\circ }\) Ahmed body. Unlike traditional synthetic jet, this new proposed zero-net-mass-flux actuator has managed to divide the blowing phase and suction phase apart on different separation edges on the rear part of the body. Numerical simulation based on the large eddy simulation method is carried out on the near-wake flow to obtain both time-averaged and transient information of the flow field. The effects of the new actuators on the flow topology, the static pressure distribution and the process of the flow are analyzed to understand the mechanism of the drag reduction. Overcoming the drawbacks of the synthetic jet, our new zero-net-mass-flux actuator has successfully reduced the aerodynamic drag by a maximum of 25.5%.

中文翻译：

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使用新的零净质量通量流量控制方法减少 25 $$^{\varvec{\circ }}$$ ∘ Ahmed 体的阻力

应用周期性强制射流形成零净质量通量致动器，用于对 \(25^{\circ }\) Ahmed 体进行主动流动控制研究。与传统的合成射流不同，这种新提出的零净质量通量执行器已成功地在机身后部的不同分离边缘上将吹气阶段和吸入阶段分开。基于大涡模拟方法对近尾流进行数值模拟，得到流场的时均和瞬态信息。分析了新执行器对流动拓扑、静压分布和流动过程的影响，以了解减阻机制。克服了合成射流的缺点，我们新的零净质量通量致动器已成功将空气阻力降低了 25.5%。