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首页> 外文期刊>International Journal of Aerodynamics >Drag reduction by pulsed jets on strongly unstructured wake: towards the square back control
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Drag reduction by pulsed jets on strongly unstructured wake: towards the square back control

机译：强烈非结构化尾流上脉冲式射流的减阻作用：向后方控制

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摘要

Experimental studies have been performed in a wind tunnel in order to control the flow separation on rear window of a generic vehicle shape (the Ahmed body with a scale of 0.7 and a slope angle of 35 degrees), The rear part of the geometry has been modified by replacing the sharp edge between roof and rear window by smooth curved surfaces. This model is equipped at the end of the roof with a strip of pulsed jets in order to control the flow with a velocity of 30 m·s~(-1). A 20% drag reduction has been obtained with a pulsed frequency at 500 Hz and a momentum coefficient C_μ = 2.75 10~(-3). This result confirms the interest in using pulsed jets in order to reduce aerodynamic drag and pollutant emission.
机译：为了控制通用车辆形状（比例为0.7且倾斜角度为35度的艾哈迈德车身）的后窗上的气流分离，已在风洞中进行了实验研究，几何形状的后部通过用光滑的曲面代替车顶和后车窗之间的锋利边缘进行修改。该模型在屋顶的末端配备了一条脉冲状的喷射带，以便以30 m·s〜（-1）的速度控制流量。在500 Hz的脉冲频率和动量系数C_μ= 2.75 10〜（-3）的情况下，阻力减小了20％。这一结果证实了使用脉冲喷射以减少空气动力阻力和污染物排放的兴趣。

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